hopper moved to its own repo. hopper now actually installs/removes

Implemented in it2taud.py:
- _parse_it_pf_envelope_raw() (it2taud.py:677) — parses IT's third envelope at IMPI+0x1D4, keeping all 25 nodes (no decimation), distinguishing pitch vs filter mode via flag bit 7.
- _env_value_at() — tick-time linear interpolation honouring env-loop wrap.
- _clone_sample(), _plan_baked_length() — sample copy and entry + N×loop_len length planner (N up to 16).
- _bake_pitch_envelope() — time-varying linear-interpolated resampling, rate = 2^(env_v/12).
- _bake_filter_envelope() — RBJ 2-pole resonant LP biquad with time-varying coefficients; cutoff mapped 110 Hz (env_v=−32) → ~28 kHz (env_v=+32), Q from inst.ifr ∈ [0.5, 6.0].
- ITInstrument extended with pf_nodes, pf_flags, ifc, ifr. parse_instruments() reads IFC/IFR at IMPI+0x39/0x3A and pf envelope at IMPI+0x1D4.
- assemble_taud() use_instruments branch now substitutes baked copies in the proxy[] list (originals in samples[] stay intact).
- --no-pf-envelope CLI flag for A/B testing; module docstring updated.

.gitignore

@@ -62,7 +62,15 @@ tsvmman.pdf
 *.ilg
 *.ind
 
+assets/disk0/tvdos/bin/tautfont.png
+
+video_encoder/*
+
+.idea/vcs.xml
+
+# in-dev stuffs
 assets/disk0/home/basic/*
 assets/disk0/movtestimg/*.jpg
 assets/disk0/*.mov
 assets/diskMediabin/*
+assets/disk0/hopper/*

.idea/artifacts/TerranBASIC.xml

@@ -21,36 +21,54 @@
       <element id="extracted-dir" path="$MAVEN_REPOSITORY$/org/jetbrains/kotlin/kotlin-reflect/1.8.21/kotlin-reflect-1.8.21.jar" path-in-jar="/" />
       <element id="extracted-dir" path="$MAVEN_REPOSITORY$/org/jetbrains/kotlin/kotlin-test/1.8.21/kotlin-test-1.8.21.jar" path-in-jar="/" />
       <element id="extracted-dir" path="$MAVEN_REPOSITORY$/org/jetbrains/kotlin/kotlin-stdlib-common/1.8.21/kotlin-stdlib-common-1.8.21.jar" path-in-jar="/" />
-      <element id="extracted-dir" path="$PROJECT_DIR$/lib/graal-sdk-22.3.1.jar" path-in-jar="/" />
+      <element id="extracted-dir" path="$PROJECT_DIR$/lib/polyglot-23.1.10.jar" path-in-jar="/" />
-      <element id="extracted-dir" path="$PROJECT_DIR$/lib/icu4j-71.1.jar" path-in-jar="/" />
+      <element id="extracted-dir" path="$PROJECT_DIR$/lib/js-language-23.1.10.jar" path-in-jar="/" />
-      <element id="extracted-dir" path="$PROJECT_DIR$/lib/js-22.3.1-edit.jar" path-in-jar="/" />
+      <element id="extracted-dir" path="$PROJECT_DIR$/lib/js-scriptengine-23.1.10.jar" path-in-jar="/" />
-      <element id="extracted-dir" path="$PROJECT_DIR$/lib/js-scriptengine-22.3.1.jar" path-in-jar="/" />
+      <element id="extracted-dir" path="$PROJECT_DIR$/lib/truffle-api-23.1.10.jar" path-in-jar="/" />
-      <element id="extracted-dir" path="$PROJECT_DIR$/lib/regex-22.3.1-edit.jar" path-in-jar="/" />
+      <element id="extracted-dir" path="$PROJECT_DIR$/lib/truffle-runtime-23.1.10.jar" path-in-jar="/" />
-      <element id="extracted-dir" path="$PROJECT_DIR$/lib/truffle-api-22.3.1.jar" path-in-jar="/" />
+      <element id="extracted-dir" path="$PROJECT_DIR$/lib/truffle-compiler-23.1.10.jar" path-in-jar="/" />
+      <element id="extracted-dir" path="$PROJECT_DIR$/lib/compiler-23.1.10.jar" path-in-jar="/" />
+      <element id="extracted-dir" path="$PROJECT_DIR$/lib/compiler-management-23.1.10.jar" path-in-jar="/" />
+      <element id="extracted-dir" path="$PROJECT_DIR$/lib/word-23.1.10.jar" path-in-jar="/" />
+      <element id="extracted-dir" path="$PROJECT_DIR$/lib/regex-23.1.10.jar" path-in-jar="/" />
+      <element id="extracted-dir" path="$PROJECT_DIR$/lib/icu4j-23.1.10.jar" path-in-jar="/" />
+      <element id="extracted-dir" path="$PROJECT_DIR$/lib/collections-23.1.10.jar" path-in-jar="/" />
+      <element id="extracted-dir" path="$PROJECT_DIR$/lib/nativeimage-23.1.10.jar" path-in-jar="/" />
+      <element id="extracted-dir" path="$PROJECT_DIR$/lib/jniutils-23.1.10.jar" path-in-jar="/" />
       <element id="extracted-dir" path="$PROJECT_DIR$/lib/gdx-1.12.1.jar" path-in-jar="/" />
       <element id="extracted-dir" path="$PROJECT_DIR$/lib/lwjgl-3.3.3.jar" path-in-jar="/" />
       <element id="extracted-dir" path="$PROJECT_DIR$/lib/lwjgl-stb-3.3.3.jar" path-in-jar="/" />
       <element id="extracted-dir" path="$PROJECT_DIR$/lib/lwjgl-glfw-3.3.3.jar" path-in-jar="/" />
-      <element id="extracted-dir" path="$PROJECT_DIR$/lib/js-22.3.1-javadoc.jar" path-in-jar="/" />
+      <element id="extracted-dir" path="$PROJECT_DIR$/lib/js-language-23.1.10-javadoc.jar" path-in-jar="/" />
-      <element id="extracted-dir" path="$PROJECT_DIR$/lib/js-22.3.1-sources.jar" path-in-jar="/" />
+      <element id="extracted-dir" path="$PROJECT_DIR$/lib/js-language-23.1.10-sources.jar" path-in-jar="/" />
       <element id="extracted-dir" path="$PROJECT_DIR$/lib/gdx-1.12.1-javadoc.jar" path-in-jar="/" />
       <element id="extracted-dir" path="$PROJECT_DIR$/lib/gdx-1.12.1-sources.jar" path-in-jar="/" />
-      <element id="extracted-dir" path="$PROJECT_DIR$/lib/icu4j-71.1-javadoc.jar" path-in-jar="/" />
+      <element id="extracted-dir" path="$PROJECT_DIR$/lib/icu4j-23.1.10-javadoc.jar" path-in-jar="/" />
-      <element id="extracted-dir" path="$PROJECT_DIR$/lib/icu4j-71.1-sources.jar" path-in-jar="/" />
+      <element id="extracted-dir" path="$PROJECT_DIR$/lib/icu4j-23.1.10-sources.jar" path-in-jar="/" />
       <element id="extracted-dir" path="$PROJECT_DIR$/lib/lwjgl-openal-3.3.3.jar" path-in-jar="/" />
       <element id="extracted-dir" path="$PROJECT_DIR$/lib/lwjgl-opengl-3.3.3.jar" path-in-jar="/" />
       <element id="extracted-dir" path="$PROJECT_DIR$/lib/lwjgl-3.3.3-javadoc.jar" path-in-jar="/" />
       <element id="extracted-dir" path="$PROJECT_DIR$/lib/lwjgl-3.3.3-sources.jar" path-in-jar="/" />
       <element id="extracted-dir" path="$PROJECT_DIR$/lib/lwjgl-jemalloc-3.3.3.jar" path-in-jar="/" />
-      <element id="extracted-dir" path="$PROJECT_DIR$/lib/regex-22.3.1-javadoc.jar" path-in-jar="/" />
+      <element id="extracted-dir" path="$PROJECT_DIR$/lib/regex-23.1.10-javadoc.jar" path-in-jar="/" />
-      <element id="extracted-dir" path="$PROJECT_DIR$/lib/regex-22.3.1-sources.jar" path-in-jar="/" />
+      <element id="extracted-dir" path="$PROJECT_DIR$/lib/regex-23.1.10-sources.jar" path-in-jar="/" />
       <element id="extracted-dir" path="$PROJECT_DIR$/lib/TerranVirtualDisk-src.jar" path-in-jar="/" />
       <element id="extracted-dir" path="$PROJECT_DIR$/lib/jorbis-0.0.17-javadoc.jar" path-in-jar="/" />
       <element id="extracted-dir" path="$PROJECT_DIR$/lib/jorbis-0.0.17-sources.jar" path-in-jar="/" />
       <element id="extracted-dir" path="$PROJECT_DIR$/lib/lwjgl-stb-3.3.3-javadoc.jar" path-in-jar="/" />
       <element id="extracted-dir" path="$PROJECT_DIR$/lib/lwjgl-stb-3.3.3-sources.jar" path-in-jar="/" />
-      <element id="extracted-dir" path="$PROJECT_DIR$/lib/graal-sdk-22.3.1-javadoc.jar" path-in-jar="/" />
+      <element id="extracted-dir" path="$PROJECT_DIR$/lib/polyglot-23.1.10-javadoc.jar" path-in-jar="/" />
-      <element id="extracted-dir" path="$PROJECT_DIR$/lib/graal-sdk-22.3.1-sources.jar" path-in-jar="/" />
+      <element id="extracted-dir" path="$PROJECT_DIR$/lib/polyglot-23.1.10-sources.jar" path-in-jar="/" />
+      <element id="extracted-dir" path="$PROJECT_DIR$/lib/truffle-api-23.1.10-javadoc.jar" path-in-jar="/" />
+      <element id="extracted-dir" path="$PROJECT_DIR$/lib/truffle-api-23.1.10-sources.jar" path-in-jar="/" />
+      <element id="extracted-dir" path="$PROJECT_DIR$/lib/truffle-runtime-23.1.10-javadoc.jar" path-in-jar="/" />
+      <element id="extracted-dir" path="$PROJECT_DIR$/lib/truffle-runtime-23.1.10-sources.jar" path-in-jar="/" />
+      <element id="extracted-dir" path="$PROJECT_DIR$/lib/collections-23.1.10-javadoc.jar" path-in-jar="/" />
+      <element id="extracted-dir" path="$PROJECT_DIR$/lib/collections-23.1.10-sources.jar" path-in-jar="/" />
+      <element id="extracted-dir" path="$PROJECT_DIR$/lib/nativeimage-23.1.10-javadoc.jar" path-in-jar="/" />
+      <element id="extracted-dir" path="$PROJECT_DIR$/lib/nativeimage-23.1.10-sources.jar" path-in-jar="/" />
+      <element id="extracted-dir" path="$PROJECT_DIR$/lib/jniutils-23.1.10-javadoc.jar" path-in-jar="/" />
+      <element id="extracted-dir" path="$PROJECT_DIR$/lib/jniutils-23.1.10-sources.jar" path-in-jar="/" />
       <element id="extracted-dir" path="$PROJECT_DIR$/lib/jlayer-1.0.1-gdx-javadoc.jar" path-in-jar="/" />
       <element id="extracted-dir" path="$PROJECT_DIR$/lib/jlayer-1.0.1-gdx-sources.jar" path-in-jar="/" />
       <element id="extracted-dir" path="$PROJECT_DIR$/lib/lwjgl-glfw-3.3.3-javadoc.jar" path-in-jar="/" />
@@ -62,15 +80,15 @@
       <element id="extracted-dir" path="$PROJECT_DIR$/lib/lwjgl-openal-3.3.3-sources.jar" path-in-jar="/" />
       <element id="extracted-dir" path="$PROJECT_DIR$/lib/lwjgl-opengl-3.3.3-javadoc.jar" path-in-jar="/" />
       <element id="extracted-dir" path="$PROJECT_DIR$/lib/lwjgl-opengl-3.3.3-sources.jar" path-in-jar="/" />
-      <element id="extracted-dir" path="$PROJECT_DIR$/lib/truffle-api-22.3.1-javadoc.jar" path-in-jar="/" />
+      <element id="extracted-dir" path="$PROJECT_DIR$/lib/regex-23.1.10-javadoc.jar" path-in-jar="/" />
-      <element id="extracted-dir" path="$PROJECT_DIR$/lib/truffle-api-22.3.1-sources.jar" path-in-jar="/" />
+      <element id="extracted-dir" path="$PROJECT_DIR$/lib/regex-23.1.10-sources.jar" path-in-jar="/" />
       <element id="extracted-dir" path="$PROJECT_DIR$/lib/lwjgl-3.3.3-natives-windows.jar" path-in-jar="/" />
       <element id="extracted-dir" path="$PROJECT_DIR$/lib/lwjgl-jemalloc-3.3.3-javadoc.jar" path-in-jar="/" />
       <element id="extracted-dir" path="$PROJECT_DIR$/lib/lwjgl-jemalloc-3.3.3-sources.jar" path-in-jar="/" />
       <element id="extracted-dir" path="$PROJECT_DIR$/lib/lwjgl-stb-3.3.3-natives-linux.jar" path-in-jar="/" />
       <element id="extracted-dir" path="$PROJECT_DIR$/lib/lwjgl-stb-3.3.3-natives-macos.jar" path-in-jar="/" />
-      <element id="extracted-dir" path="$PROJECT_DIR$/lib/js-scriptengine-22.3.1-javadoc.jar" path-in-jar="/" />
+      <element id="extracted-dir" path="$PROJECT_DIR$/lib/js-scriptengine-23.1.10-javadoc.jar" path-in-jar="/" />
-      <element id="extracted-dir" path="$PROJECT_DIR$/lib/js-scriptengine-22.3.1-sources.jar" path-in-jar="/" />
+      <element id="extracted-dir" path="$PROJECT_DIR$/lib/js-scriptengine-23.1.10-sources.jar" path-in-jar="/" />
       <element id="extracted-dir" path="$PROJECT_DIR$/lib/lwjgl-glfw-3.3.3-natives-linux.jar" path-in-jar="/" />
       <element id="extracted-dir" path="$PROJECT_DIR$/lib/lwjgl-glfw-3.3.3-natives-macos.jar" path-in-jar="/" />
       <element id="extracted-dir" path="$PROJECT_DIR$/lib/gdx-jnigen-loader-2.3.1-javadoc.jar" path-in-jar="/" />

.idea/cody_history.xml

@@ -0,0 +1,133 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ChatHistory">
+    <accountData>
+      <list>
+        <AccountData>
+          <accountId value="VXNlcjo1NTUxMzY=" />
+          <chats>
+            <list>
+              <chat>
+                <internalId value="8a32c880-d8ec-4d84-b5f7-a62b2edf63c3" />
+                <llm>
+                  <llm>
+                    <model value="anthropic/claude-3-5-sonnet-20240620" />
+                    <provider value="Anthropic" />
+                    <title value="Claude 3.5 Sonnet" />
+                    <usage>
+                      <list>
+                        <option value="chat" />
+                        <option value="edit" />
+                      </list>
+                    </usage>
+                  </llm>
+                </llm>
+              </chat>
+              <chat>
+                <internalId value="f4e7338b-57d3-44e0-b1d9-04aa2dfb4bae" />
+                <llm>
+                  <llm>
+                    <model value="anthropic/claude-3-5-sonnet-20240620" />
+                    <provider value="Anthropic" />
+                    <title value="Claude 3.5 Sonnet" />
+                    <usage>
+                      <list>
+                        <option value="chat" />
+                        <option value="edit" />
+                      </list>
+                    </usage>
+                  </llm>
+                </llm>
+              </chat>
+              <chat>
+                <internalId value="26ac815b-5db9-488b-be0b-ab174fbc5646" />
+                <llm>
+                  <llm>
+                    <model value="anthropic/claude-3-5-sonnet-20240620" />
+                    <provider value="Anthropic" />
+                    <title value="Claude 3.5 Sonnet" />
+                    <usage>
+                      <list>
+                        <option value="chat" />
+                        <option value="edit" />
+                      </list>
+                    </usage>
+                  </llm>
+                </llm>
+              </chat>
+              <chat>
+                <internalId value="8ab39b26-cdda-4256-878f-e0416e66bbea" />
+                <llm>
+                  <llm>
+                    <model value="anthropic/claude-3-5-sonnet-20240620" />
+                    <provider value="Anthropic" />
+                    <title value="Claude 3.5 Sonnet" />
+                    <usage>
+                      <list>
+                        <option value="chat" />
+                        <option value="edit" />
+                      </list>
+                    </usage>
+                  </llm>
+                </llm>
+              </chat>
+              <chat>
+                <internalId value="f79a288a-adc5-4d45-a069-4bf024d90236" />
+                <llm>
+                  <llm>
+                    <model value="anthropic/claude-3-5-sonnet-20240620" />
+                    <provider value="Anthropic" />
+                    <title value="Claude 3.5 Sonnet" />
+                    <usage>
+                      <list>
+                        <option value="chat" />
+                        <option value="edit" />
+                      </list>
+                    </usage>
+                  </llm>
+                </llm>
+              </chat>
+              <chat>
+                <internalId value="20bc02fd-c6b5-4590-a00b-b7012a630ef4" />
+                <llm>
+                  <llm>
+                    <model value="anthropic/claude-3-5-sonnet-20240620" />
+                    <provider value="Anthropic" />
+                    <title value="Claude 3.5 Sonnet" />
+                    <usage>
+                      <list>
+                        <option value="chat" />
+                        <option value="edit" />
+                      </list>
+                    </usage>
+                  </llm>
+                </llm>
+              </chat>
+            </list>
+          </chats>
+          <defaultLlm>
+            <llm>
+              <model value="anthropic/claude-3-5-sonnet-20240620" />
+              <provider value="Anthropic" />
+              <tags>
+                <list>
+                  <option value="gateway" />
+                  <option value="accuracy" />
+                  <option value="recommended" />
+                  <option value="free" />
+                </list>
+              </tags>
+              <title value="Claude 3.5 Sonnet" />
+              <usage>
+                <list>
+                  <option value="chat" />
+                  <option value="edit" />
+                </list>
+              </usage>
+            </llm>
+          </defaultLlm>
+        </AccountData>
+      </list>
+    </accountData>
+  </component>
+</project>

.idea/libraries/badlogicgames_gdx.xml

@@ -0,0 +1,11 @@
+<component name="libraryTable">
+  <library name="badlogicgames.gdx" type="repository">
+    <properties maven-id="com.badlogicgames.gdx:gdx:1.12.1" />
+    <CLASSES>
+      <root url="jar://$MAVEN_REPOSITORY$/com/badlogicgames/gdx/gdx/1.12.1/gdx-1.12.1.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/com/badlogicgames/gdx/gdx-jnigen-loader/2.3.1/gdx-jnigen-loader-2.3.1.jar!/" />
+    </CLASSES>
+    <JAVADOC />
+    <SOURCES />
+  </library>
+</component>

.idea/libraries/badlogicgames_gdx_backend_lwjgl3.xml

@@ -0,0 +1,62 @@
+<component name="libraryTable">
+  <library name="badlogicgames.gdx.backend.lwjgl3" type="repository">
+    <properties maven-id="com.badlogicgames.gdx:gdx-backend-lwjgl3:1.12.1" />
+    <CLASSES>
+      <root url="jar://$MAVEN_REPOSITORY$/com/badlogicgames/gdx/gdx-backend-lwjgl3/1.12.1/gdx-backend-lwjgl3-1.12.1.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/com/badlogicgames/gdx/gdx/1.12.1/gdx-1.12.1.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/com/badlogicgames/gdx/gdx-jnigen-loader/2.3.1/gdx-jnigen-loader-2.3.1.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/lwjgl/lwjgl/3.3.3/lwjgl-3.3.3.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/lwjgl/lwjgl/3.3.3/lwjgl-3.3.3-natives-linux.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/lwjgl/lwjgl/3.3.3/lwjgl-3.3.3-natives-linux-arm32.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/lwjgl/lwjgl/3.3.3/lwjgl-3.3.3-natives-linux-arm64.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/lwjgl/lwjgl/3.3.3/lwjgl-3.3.3-natives-macos.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/lwjgl/lwjgl/3.3.3/lwjgl-3.3.3-natives-macos-arm64.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/lwjgl/lwjgl/3.3.3/lwjgl-3.3.3-natives-windows.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/lwjgl/lwjgl/3.3.3/lwjgl-3.3.3-natives-windows-x86.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/lwjgl/lwjgl-glfw/3.3.3/lwjgl-glfw-3.3.3.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/lwjgl/lwjgl-glfw/3.3.3/lwjgl-glfw-3.3.3-natives-linux.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/lwjgl/lwjgl-glfw/3.3.3/lwjgl-glfw-3.3.3-natives-linux-arm32.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/lwjgl/lwjgl-glfw/3.3.3/lwjgl-glfw-3.3.3-natives-linux-arm64.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/lwjgl/lwjgl-glfw/3.3.3/lwjgl-glfw-3.3.3-natives-macos.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/lwjgl/lwjgl-glfw/3.3.3/lwjgl-glfw-3.3.3-natives-macos-arm64.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/lwjgl/lwjgl-glfw/3.3.3/lwjgl-glfw-3.3.3-natives-windows.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/lwjgl/lwjgl-glfw/3.3.3/lwjgl-glfw-3.3.3-natives-windows-x86.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/lwjgl/lwjgl-jemalloc/3.3.3/lwjgl-jemalloc-3.3.3.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/lwjgl/lwjgl-jemalloc/3.3.3/lwjgl-jemalloc-3.3.3-natives-linux.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/lwjgl/lwjgl-jemalloc/3.3.3/lwjgl-jemalloc-3.3.3-natives-linux-arm32.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/lwjgl/lwjgl-jemalloc/3.3.3/lwjgl-jemalloc-3.3.3-natives-linux-arm64.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/lwjgl/lwjgl-jemalloc/3.3.3/lwjgl-jemalloc-3.3.3-natives-macos.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/lwjgl/lwjgl-jemalloc/3.3.3/lwjgl-jemalloc-3.3.3-natives-macos-arm64.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/lwjgl/lwjgl-jemalloc/3.3.3/lwjgl-jemalloc-3.3.3-natives-windows.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/lwjgl/lwjgl-jemalloc/3.3.3/lwjgl-jemalloc-3.3.3-natives-windows-x86.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/lwjgl/lwjgl-openal/3.3.3/lwjgl-openal-3.3.3.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/lwjgl/lwjgl-openal/3.3.3/lwjgl-openal-3.3.3-natives-linux.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/lwjgl/lwjgl-openal/3.3.3/lwjgl-openal-3.3.3-natives-linux-arm32.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/lwjgl/lwjgl-openal/3.3.3/lwjgl-openal-3.3.3-natives-linux-arm64.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/lwjgl/lwjgl-openal/3.3.3/lwjgl-openal-3.3.3-natives-macos.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/lwjgl/lwjgl-openal/3.3.3/lwjgl-openal-3.3.3-natives-macos-arm64.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/lwjgl/lwjgl-openal/3.3.3/lwjgl-openal-3.3.3-natives-windows.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/lwjgl/lwjgl-openal/3.3.3/lwjgl-openal-3.3.3-natives-windows-x86.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/lwjgl/lwjgl-opengl/3.3.3/lwjgl-opengl-3.3.3.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/lwjgl/lwjgl-opengl/3.3.3/lwjgl-opengl-3.3.3-natives-linux.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/lwjgl/lwjgl-opengl/3.3.3/lwjgl-opengl-3.3.3-natives-linux-arm32.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/lwjgl/lwjgl-opengl/3.3.3/lwjgl-opengl-3.3.3-natives-linux-arm64.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/lwjgl/lwjgl-opengl/3.3.3/lwjgl-opengl-3.3.3-natives-macos.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/lwjgl/lwjgl-opengl/3.3.3/lwjgl-opengl-3.3.3-natives-macos-arm64.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/lwjgl/lwjgl-opengl/3.3.3/lwjgl-opengl-3.3.3-natives-windows.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/lwjgl/lwjgl-opengl/3.3.3/lwjgl-opengl-3.3.3-natives-windows-x86.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/lwjgl/lwjgl-stb/3.3.3/lwjgl-stb-3.3.3.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/lwjgl/lwjgl-stb/3.3.3/lwjgl-stb-3.3.3-natives-linux.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/lwjgl/lwjgl-stb/3.3.3/lwjgl-stb-3.3.3-natives-linux-arm32.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/lwjgl/lwjgl-stb/3.3.3/lwjgl-stb-3.3.3-natives-linux-arm64.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/lwjgl/lwjgl-stb/3.3.3/lwjgl-stb-3.3.3-natives-macos.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/lwjgl/lwjgl-stb/3.3.3/lwjgl-stb-3.3.3-natives-macos-arm64.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/lwjgl/lwjgl-stb/3.3.3/lwjgl-stb-3.3.3-natives-windows.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/lwjgl/lwjgl-stb/3.3.3/lwjgl-stb-3.3.3-natives-windows-x86.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/com/badlogicgames/jlayer/jlayer/1.0.1-gdx/jlayer-1.0.1-gdx.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/jcraft/jorbis/0.0.17/jorbis-0.0.17.jar!/" />
+    </CLASSES>
+    <JAVADOC />
+    <SOURCES />
+  </library>
+</component>

.idea/markdown.xml

@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="MarkdownSettings">
+    <option name="previewPanelProviderInfo">
+      <ProviderInfo name="Compose (experimental)" className="com.intellij.markdown.compose.preview.ComposePanelProvider" />
+    </option>
+    <option name="splitLayout" value="SHOW_EDITOR" />
+  </component>
+</project>

.idea/misc.xml

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
-  <component name="ProjectRootManager" version="2" languageLevel="JDK_21" default="true" project-jdk-name="17" project-jdk-type="JavaSDK">
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_21" default="true" project-jdk-name="21" project-jdk-type="JavaSDK">
     <output url="file://$PROJECT_DIR$/out" />
   </component>
 </project>

.idea/runConfigurations/AppLoader.xml

@@ -0,0 +1,17 @@
+<component name="ProjectRunConfigurationManager">
+  <configuration default="false" name="AppLoader" type="Application" factoryName="Application" nameIsGenerated="true">
+    <option name="ALTERNATIVE_JRE_PATH" value="21" />
+    <option name="MAIN_CLASS_NAME" value="net.torvald.tsvm.AppLoader" />
+    <module name="tsvm_executable" />
+    <option name="VM_PARAMETERS" value="-ea --upgrade-module-path=lib/compiler-23.1.10.jar:lib/compiler-management-23.1.10.jar:lib/truffle-compiler-23.1.10.jar:lib/truffle-api-23.1.10.jar:lib/truffle-runtime-23.1.10.jar:lib/polyglot-23.1.10.jar:lib/collections-23.1.10.jar:lib/word-23.1.10.jar:lib/nativeimage-23.1.10.jar:lib/jniutils-23.1.10.jar -XX:+UnlockExperimentalVMOptions -XX:+EnableJVMCI -XX:+UseZGC -XX:+UseDynamicNumberOfGCThreads --add-exports=java.base/jdk.internal.misc=jdk.internal.vm.compiler" />
+    <extension name="coverage">
+      <pattern>
+        <option name="PATTERN" value="net.torvald.tsvm.*" />
+        <option name="ENABLED" value="true" />
+      </pattern>
+    </extension>
+    <method v="2">
+      <option name="Make" enabled="true" />
+    </method>
+  </configuration>
+</component>

.idea/runConfigurations/TerranBASIC.xml

@@ -0,0 +1,16 @@
+<component name="ProjectRunConfigurationManager">
+  <configuration default="false" name="TerranBASIC" type="Application" factoryName="Application" nameIsGenerated="true">
+    <option name="MAIN_CLASS_NAME" value="net.torvald.tsvm.TerranBASIC" />
+    <module name="TerranBASICexecutable" />
+    <option name="VM_PARAMETERS" value="--upgrade-module-path=lib/compiler-23.1.10.jar:lib/compiler-management-23.1.10.jar:lib/truffle-compiler-23.1.10.jar:lib/truffle-api-23.1.10.jar:lib/truffle-runtime-23.1.10.jar:lib/polyglot-23.1.10.jar:lib/collections-23.1.10.jar:lib/word-23.1.10.jar:lib/nativeimage-23.1.10.jar:lib/jniutils-23.1.10.jar -XX:+UnlockExperimentalVMOptions -XX:+EnableJVMCI --add-exports=java.base/jdk.internal.misc=jdk.internal.vm.compiler" />
+    <extension name="coverage">
+      <pattern>
+        <option name="PATTERN" value="net.torvald.tsvm.*" />
+        <option name="ENABLED" value="true" />
+      </pattern>
+    </extension>
+    <method v="2">
+      <option name="Make" enabled="true" />
+    </method>
+  </configuration>
+</component>

.idea/runConfigurations/TsvmEmulator.xml

@@ -0,0 +1,16 @@
+<component name="ProjectRunConfigurationManager">
+  <configuration default="false" name="TsvmEmulator" type="Application" factoryName="Application" nameIsGenerated="true">
+    <option name="MAIN_CLASS_NAME" value="net.torvald.tsvm.TsvmEmulator" />
+    <module name="tsvm_executable" />
+    <option name="VM_PARAMETERS" value="-ea --upgrade-module-path=lib/compiler-23.1.10.jar:lib/compiler-management-23.1.10.jar:lib/truffle-compiler-23.1.10.jar:lib/truffle-api-23.1.10.jar:lib/truffle-runtime-23.1.10.jar:lib/polyglot-23.1.10.jar:lib/collections-23.1.10.jar:lib/word-23.1.10.jar:lib/nativeimage-23.1.10.jar:lib/jniutils-23.1.10.jar -XX:+UnlockExperimentalVMOptions -XX:+EnableJVMCI -XX:+UseZGC -XX:+UseDynamicNumberOfGCThreads --add-exports=java.base/jdk.internal.misc=jdk.internal.vm.compiler" />
+    <extension name="coverage">
+      <pattern>
+        <option name="PATTERN" value="net.torvald.tsvm.*" />
+        <option name="ENABLED" value="true" />
+      </pattern>
+    </extension>
+    <method v="2">
+      <option name="Make" enabled="true" />
+    </method>
+  </configuration>
+</component>

.idea/vcs.xml

@@ -2,5 +2,7 @@
 <project version="4">
   <component name="VcsDirectoryMappings">
     <mapping directory="$PROJECT_DIR$" vcs="Git" />
+    <mapping directory="$PROJECT_DIR$/assets/disk0/home/tetrino" vcs="Git" />
+    <mapping directory="$PROJECT_DIR$/assets/disk0/home/tvnes" vcs="Git" />
   </component>
 </project>

2taud.sh

@@ -0,0 +1,12 @@
+#!/usr/bin/env fish
+
+for f in *.mod; python3 mod2taud.py $f assets/disk0/home/music/(basename $f .mod).taud; end
+for f in *.MOD; python3 mod2taud.py $f assets/disk0/home/music/(basename $f .MOD).taud; end
+for f in *.s3m; python3 s3m2taud.py $f assets/disk0/home/music/(basename $f .s3m).taud; end
+for f in *.S3M; python3 s3m2taud.py $f assets/disk0/home/music/(basename $f .S3M).taud; end
+for f in *.it; python3 it2taud.py $f assets/disk0/home/music/(basename $f .it).taud; end
+for f in *.IT; python3 it2taud.py $f assets/disk0/home/music/(basename $f .IT).taud; end
+for f in *.xm; python3 xm2taud.py $f assets/disk0/home/music/(basename $f .xm).taud; end
+for f in *.XM; python3 xm2taud.py $f assets/disk0/home/music/(basename $f .XM).taud; end
+for f in *.mon; python3 mon2taud.py $f assets/disk0/home/music/(basename $f .mon).taud; end
+for f in *.MON; python3 mon2taud.py $f assets/disk0/home/music/(basename $f .MON).taud; end

CLAUDE.md

@@ -12,6 +12,37 @@ This file provides guidance to Claude Code (claude.ai/code) when working with co
 - TerranBASIC integration
 - Multiple platform build system
 
+## Documentations
+
+Documentation for TSVM and TVDOS are available on `./doc/*.tex` as machine-readable format.
+
+Documentatino for TSVM architecture is available on `terranmon.txt`
+
+## Reference Materials
+
+Third-party source-code references that inform TSVM implementations live in
+`reference_materials/<topic>/`. Each topic folder has a `README.md` that
+summarises the takeaway and points back into the verbatim source files.
+**Consult these before reimplementing tracker / codec / DSP behaviour from
+memory** — TSVM aims to match the audible behaviour of the originals.
+
+Current topics:
+
+- `reference_materials/tracker_filter/` — Impulse Tracker / OpenMPT / Schism
+  Tracker resonant low-pass filter source. Defines the cutoff formula, the
+  resonance damping curve, and the **IIR-only 2-pole topology** (NOT a
+  biquad — no feedforward x[n−1] / x[n−2] terms) that `AudioAdapter.kt` uses
+  for Taud playback.
+- `reference_materials/ft2-clone` — Modernised clone for the original FastTracker 2
+- `reference_materials/impulse-tracker` — The original source code for ImpulseTracker
+- `reference_materials/MilkyTracker` — FastTracker 2 compatible tracker
+- `reference_materials/schismtracker` — Open-source re-implementation of ImpulseTracker
+- `reference_materials/pt2-clone` — Open-source re-implementation of ProTracker 2
+
+When fetching new references, copy the relevant upstream files verbatim into
+a topic folder, write a `README.md` summarising the relevant maths /
+algorithms with file:line citations, and add an entry here.
+
 ## Architecture
 
 ### Core Components
@@ -62,12 +93,12 @@ Use the build scripts in `buildapp/`:
 
 ### Prerequisites
 
-1. Download JDK 17 runtimes to `~/Documents/openjdk/*` with specific naming:
+1. Download JDK 21 runtimes to `~/Documents/openjdk/*` with specific naming:
-   - `jdk-17.0.1-x86` (Linux AMD64)
+   - `jdk-21.0.1-x86` (Linux AMD64)
-   - `jdk-17.0.1-arm` (Linux Aarch64) 
+   - `jdk-21.0.1-arm` (Linux Aarch64) 
-   - `jdk-17.0.1-windows` (Windows AMD64)
+   - `jdk-21.0.1-windows` (Windows AMD64)
-   - `jdk-17.0.1.jdk-arm` (macOS Apple Silicon)
+   - `jdk-21.0.1.jdk-arm` (macOS Apple Silicon)
-   - `jdk-17.0.1.jdk-x86` (macOS Intel)
+   - `jdk-21.0.1.jdk-x86` (macOS Intel)
 
 2. Run `jlink` commands to create custom Java runtimes in `out/runtime-*` directories
 
@@ -85,6 +116,16 @@ Use the build scripts in `buildapp/`:
 - `My_BASIC_Programs/`: Example BASIC programs for testing
 - TVDOS filesystem uses custom format with specialised drivers
 
+### TSVM JavaScript Source Encoding
+
+**Do not normalise `\uXXXX` or `\xXX` escapes in .js / .mjs files that run inside
+TSVM.** TSVM's character set is not Unicode, and the JS string literal parser
+behaves differently for raw bytes vs. escape sequences. Both forms appear in
+existing code intentionally — leave each one as-is. When writing new content,
+prefer raw UTF-8 characters in string literals (e.g. write the character `ù`
+directly, rather than a `\uXXXX`-style escape) unless you are matching a
+pattern already established in the surrounding code.
+
 ## Videotron2K
 
 The Videotron2K is a specialised video display controller with:

README.md

@@ -1,8 +1,222 @@
 ![tsvm](tsvm_screenshot.png)
 
-**tsvm** /tiː.ɛs.viː.ɛm/ is a virtual machine with the architecture that mimics the 8-bit era of
+# tsvm
-computers, and runs programs written in Javascript.
 
-**tsvm** repository includes the virtual machine itself, the reference BIOS
+**tsvm** /tiː.ɛs.viː.ɛm/ is a fantasy computer platform: a virtual machine whose
-implementation and a DOS; BASIC is provided by the [TerranBASIC](https://github.com/curioustorvald/TerranBASIC)
+architecture is inspired by the 8-bit and early 16-bit home computers, built
-repository.
+from the ground up around running JavaScript as its native machine code.
+
+What started as "an 8-bit-flavoured VM that runs JS" has grown into a complete,
+self-hosted retro computing ecosystem — with its own BIOS, operating system,
+filesystem, video and audio codecs, video display coprocessor with its own
+assembly language, tracker music format, and a stack of userland tools that
+together come closer to a small alternate-history computer line than a
+single-binary emulator.
+
+This repository contains the virtual machine core, the reference BIOS
+implementations, the **TVDOS** operating system, the **Videotron2K** video
+display controller, hardware-accelerated codec backends for the **TEV / TAV /
+TAD** media formats, and the multi-platform packaging scripts. The
+[TerranBASIC](https://github.com/curioustorvald/TerranBASIC) repository
+provides the matching BASIC dialect that ships on the system disk.
+
+## What's actually in here
+
+### The virtual machine
+
+- **VM core** (`tsvm_core/`) — memory model, peripheral bus, MMIO, JS
+  sandboxing through GraalVM, watchdog, DMA engine, and cooperative scheduling.
+  Up to 8 hot-pluggable peripheral slots, each with a dedicated MMIO window
+  and memory-space window mapped into the VM's negative address range.
+- **Multiple BIOS implementations** (`assets/bios/`) — including the reference
+  `tsvmbios.js`, an OpenBIOS variant, the TBM-BIOS for TerranBASIC machines,
+  and the Pip-Boy-style `pipboot.rom`. BIOSes are first-class swappable
+  components, not a fixed boot blob.
+- **Reference monitor / debugger** (`mon.js`) for poking at memory and
+  peripherals from a running machine.
+- **Multi-platform packaging** (`buildapp/`) — scripts to produce Linux x86_64
+  / ARM64 AppImages, macOS Intel / Apple Silicon bundles, and Windows builds,
+  each with its own `jlink`-trimmed JDK 21 runtime.
+
+### Peripherals (the "hardware")
+
+Living under `tsvm_core/src/net/torvald/tsvm/peripheral/`:
+
+- **Graphics adapters** — the standard `GraphicsAdapter`, plus `TexticsAdapter`
+  for text-mode framebuffers, `ExtDisp` for external displays, and a
+  `RemoteGraphicsAdapter` for networked rendering.
+- **Audio devices** — `AudioAdapter` (the main programmable sound chip with
+  PCM channels, an Impulse Tracker-style resonant low-pass filter, and a
+  hardware-accelerated **TAD** decoder), `OpenALBufferedAudioDevice`, and the
+  `MP2Env` MPEG audio environment.
+- **Disk drives** — `TevdDiskDrive` (TEVD custom filesystem),
+  `ClusteredDiskDrive`, `TestDiskDrive`, and a latency-simulator script for
+  testing slow-storage behaviour.
+- **Networking and serial** — `HttpModem`, `HSDPA` / `HostFileHSDPA` for
+  high-speed packet I/O, `SerialStdioHost`, `BlockTransferInterface` /
+  `BlockTransferPort`.
+- **Terminals and displays** — `TTY`, `GlassTty`, `TermSim`, and a
+  `CharacterLCDdisplay` for HD44780-flavoured projects.
+- **Memory expansion** — `RamBank` for bank-switched memory, plus a
+  programmable `TestFunctionGenerator`.
+
+### Videotron2K — the video coprocessor
+
+Videotron2K is a programmable video display controller with its **own
+assembly-like language**, six general registers (`r1`–`r6`), special registers
+(`tmr`, `frm`, `px`, `py`, `c1`–`c6`), a scene-based programming model, and
+conditional postfixes (`zr`, `nz`, `gt`, `ls`, `ge`, `le`). Programs declare
+`SCENE` blocks and dispatch them with `perform`. Drawing primitives include
+`plot`, `fillin`, `fillscr`, and `goto`. See `Videotron2K.md` and the VDC
+implementation under `tsvm_core/.../vdc/`.
+
+### TVDOS — the operating system
+
+`assets/disk0/tvdos/` is a complete DOS-style userland:
+
+- **Kernel and drivers** — `TVDOS.SYS`, `HSDPADRV.SYS`, `hyve.SYS`,
+  installable drivers under `moviedev/` and `tuidev/`.
+- **Custom filesystem** — TEVD, with the on-disk format documented in
+  `tvdos/filesystem.md`.
+- **Internationalisation** — Colemak / Dvorak / QWERTY keymaps and an `i18n/`
+  resource tree.
+- **Userland binaries** (`tvdos/bin/`) — a shell (`command.js`), file tools
+  (`hexdump`, `less`, `tee`, `touch`, `printfile`, `writeto`, `defrag`,
+  `lfs`, `drives`), an editor (`edit.js`), a file manager (`zfm.js`), a
+  network fetcher (`geturl`), gzip/Zstd helpers, palette tools, and a battery
+  of media players (`playmp2`, `playpcm`, `playwav`, `playmv1`, `playtev`,
+  `playtav`, `playtad`, `playucf`).
+- **Taut tracker** — a full in-VM tracker (`taut.js`,
+  `taut_instredit.js`, `taut_sampleedit.js`, `taut_notationedit.js`,
+  `taut_fileop.js`) with its own font and chrome assets.
+
+### Codecs and media formats
+
+tsvm ships a small but serious codec lab. Encoders are written in C and live
+in `video_encoder/`; decoders are split between JavaScript players in TVDOS
+and hardware-accelerated Kotlin backends in the VM core.
+
+- **iPF (Type 1 / 2 / 1-delta)** — picture and legacy movie format. Encoders:
+  `encodeipf.js`, `encodemov.js`, `encodemov2.js`. Documented in
+  `terranmon.txt`.
+- **TEV (TSVM Enhanced Video)** — modern DCT codec with motion compensation,
+  16×16 blocks, YCoCg-R 4:2:0, and either quality-mode or bitrate-mode rate
+  control. Encoder: `video_encoder/encoder_tev.c`. Decoder: `playtev.js`,
+  with `tevDecode` / `tevIdct8x8` / `tevMotionCopy8x8` accelerated in
+  `GraphicsJSR223Delegate.kt`.
+- **TAV (TSVM Advanced Video)** — successor to TEV based on the Discrete
+  Wavelet Transform. Five wavelet types (5/3 reversible, 9/7 irreversible,
+  CDF 13/7, DD-4, Haar), 6-level decomposition, EZBC sparsity coding,
+  perceptual quantisation, and an optional **3D temporal DWT** that encodes
+  whole groups of pictures as one unified wavelet tree. Includes a packet
+  inspector (`tav_inspector.c`) and coefficient visualiser
+  (`tav_visualise_coefficients.c`).
+- **TAD (TSVM Advanced Audio)** — perceptual audio codec at 32 kHz stereo,
+  using CDF 9/7 wavelets, M/S decorrelation, gamma compression, pre-emphasis,
+  EZBC, and Zstd. Achieves ~2.5:1 compression vs. PCMu8 at quality 3 while
+  preserving the full 0–16 kHz band. Designed to be embeddable inside TAV so
+  audio chunks can align with video GOP boundaries.
+- **Taud** — tracker module format with conversion tools from
+  the major formats: `it2taud.py` (Impulse Tracker), `mod2taud.py`
+  (ProTracker / FastTracker), `s3m2taud.py` (Scream Tracker 3), plus
+  `2taud.sh` and shared helpers in `taud_common.py`. Note effects are
+  documented in `TAUD_NOTE_EFFECTS.md`. The `AudioAdapter` runs the same
+  IIR-only 2-pole resonant low-pass topology used by Impulse Tracker /
+  OpenMPT / Schism.
+- **MP2** — reference MPEG-1 Layer II environment via `MP2Env.kt` and
+  `playmp2.js`.
+
+### Languages and runtimes
+
+- **JavaScript** is the VM's native code, executed by GraalVM in a sandboxed
+  context with a curated set of host bindings (graphics, audio, filesystem,
+  DMA, compression, networking, low-level peek/poke).
+- **TerranBASIC** is provided by the
+  [TerranBASIC](https://github.com/curioustorvald/TerranBASIC) repository and
+  shipped as `tbas` on the system disk. The `TerranBASICexecutable/` subproject
+  packages a BASIC-only flavour of the machine.
+- **Videotron2K assembly** for VDC programs.
+
+### Documentation
+
+- `terranmon.txt` — the architecture reference (memory map, peripheral
+  protocol, codec bitstreams).
+- `doc/*.tex` — machine-readable LaTeX sources for the TSVM and TVDOS manuals,
+  built with `doc/makepdf.sh`.
+- `Videotron2K.md` — VDC programming guide.
+- `TAUD_NOTE_EFFECTS.md` — tracker effect reference.
+- `CLAUDE.md` — a condensed map of the project for collaborators (and
+  language-model assistants) working in the tree.
+
+## Building and running
+
+### Prerequisites
+
+JDK 21 runtimes laid out under `~/Documents/openjdk/` with platform-specific
+names:
+
+- `jdk-21.0.1-x86` — Linux AMD64
+- `jdk-21.0.1-arm` — Linux Aarch64
+- `jdk-21.0.1-windows` — Windows AMD64
+- `jdk-21.0.1.jdk-x86` — macOS Intel
+- `jdk-21.0.1.jdk-arm` — macOS Apple Silicon
+
+`jlink` is then used to produce trimmed runtimes under `out/runtime-*`.
+
+### Common entry points
+
+- **Run the emulator** — `TsvmEmulator.java` (in `tsvm_executable/`).
+- **Run TerranBASIC-only build** — `TerranBASIC.java` (in
+  `TerranBASICexecutable/`).
+- **Package an installable bundle** — pick the right script in `buildapp/`:
+    - `build_app_linux_x86.sh`
+    - `build_app_linux_arm.sh`
+    - `build_app_mac_x86.sh`
+    - `build_app_mac_arm.sh`
+    - `build_app_windows_x86.sh`
+- **Build C encoders** — in `video_encoder/`: `make` (TEV), `make tav`,
+  `make tad`.
+
+### Encoding sample media
+
+```bash
+# Quality-mode TEV encode
+./encoder_tev -i input.mp4 -o clip.tev -q 3
+
+# TAV with 9/7 wavelet, quality 4
+./encoder_tav -i input.mp4 -w 1 -q 4 -o clip.tav
+
+# TAV with 3D temporal DWT (GOP-unified encoding)
+./encoder_tav -i input.mp4 --temporal-dwt -o clip.tav
+
+# TAD audio at the highest quality
+./encoder_tad -i input.mp4 -o track.tad -q 5
+```
+
+Then, inside TVDOS:
+
+```
+A:\> playtev clip.tev
+A:\> playtav clip.tav
+A:\> playtad track.tad
+```
+
+## Repository layout
+
+```
+tsvm_core/             VM core, peripherals, VDC, JS bindings (Kotlin)
+tsvm_executable/       Main emulator GUI (LibGDX)
+TerranBASICexecutable/ For creatingTerranBASIC executable
+assets/bios/           BIOS ROMs and source
+assets/disk0/          Boot disk image, including all of TVDOS
+video_encoder/         C encoders, decoder libs, inspectors (TEV / TAV / TAD)
+ipf_encoder/           Reference iPF encoder
+doc/                   LaTeX sources for the TSVM / TVDOS manuals
+buildapp/              Per-platform packaging scripts
+My_BASIC_Programs/     Example BASIC programs
+*.py, *.sh, *.kts      Conversion tools and ad-hoc utilities
+```
+
+## Licence
+
+See `COPYING`.

TerranBASICexecutable/TerranBASICexecutable.iml

@@ -10,5 +10,7 @@
     <orderEntry type="module" module-name="tsvm_core" />
     <orderEntry type="library" name="TerranVirtualDisk" level="project" />
     <orderEntry type="library" name="lib" level="project" />
+    <orderEntry type="library" name="badlogicgames.gdx" level="project" />
+    <orderEntry type="library" name="badlogicgames.gdx.backend.lwjgl3" level="project" />
   </component>
 </module>

TerranBASICexecutable/src/net/torvald/tsvm/VMGUI.kt

@@ -122,8 +122,39 @@ class VMGUI(val loaderInfo: EmulInstance, val viewportWidth: Int, val viewportHe
     private var rebootRequested = false
 
     private fun reboot() {
-        vmRunner.close()
+        // Order is critical: stop ALL execution first, then dispose peripherals
-        coroutineJob.interrupt()
+        // before re-initialising. Without this, the old JS thread races the new
+        // one on shared VM memory / IO state and can SIGSEGV on disposed peripherals.
+
+        // 1. Stop parallel/child contexts. park() interrupts and joins them.
+        vm.park()
+        vm.poke(-90L, -128)
+
+        // 2. Interrupt the main runner thread and cancel the GraalVM context.
+        if (::coroutineJob.isInitialized) coroutineJob.interrupt()
+        try { if (::vmRunner.isInitialized) vmRunner.close() } catch (_: Throwable) {}
+
+        // 3. Wait for the main runner thread to actually finish.
+        if (::coroutineJob.isInitialized && coroutineJob !== Thread.currentThread()) {
+            try {
+                coroutineJob.join(2000L)
+                if (coroutineJob.isAlive) {
+                    System.err.println("[VMGUI] runner ${vm.id} did not exit within 2s; proceeding anyway")
+                    coroutineJob.interrupt()
+                }
+            }
+            catch (_: InterruptedException) {
+                Thread.currentThread().interrupt()
+            }
+        }
+
+        // 4. Now it's safe to release native resources held by peripherals.
+        for (i in 1 until vm.peripheralTable.size) {
+            try {
+                vm.peripheralTable[i].peripheral?.dispose()
+            }
+            catch (_: Throwable) {}
+        }
 
         vm.init()
         init()

assets/bios/tsvmbios.js

@@ -1,5 +1,5 @@
 con.reset_graphics();con.curs_set(0);con.clear();
-graphics.resetPalette();graphics.setBackground(0,0,0);
+graphics.resetPalette();graphics.setPalette(0, 0, 0, 0, 15);graphics.setBackground(0,0,0);
 
 let logo = gzip.decomp(base64.atob("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"));
 
@@ -77,7 +77,7 @@ tmr = sys.nanoTime();
 while (sys.nanoTime() - tmr < 2147483648) sys.spin();
 // clear screen
 graphics.clearPixels(255);con.color_pair(239,255);
-con.clear();con.move(1,1);
+con.clear();con.move(1,1);graphics.resetPalette();
 
 ///////////////////////////////////////////////////////////////////////////////
 

assets/disk0/!BOOTSEC

@@ -1 +1 @@
-let p=_BIOS.FIRST_BOOTABLE_PORT;com.sendMessage(p[0],"DEVRST\x17");com.sendMessage(p[0],'OPENR"tvdos/hyve.SYS",'+p[1]);let r=com.getStatusCode(p[0]);if(0==r)if(com.sendMessage(p[0],"READ"),r=com.getStatusCode(p[0]),0==r){let g=com.pullMessage(p[0]);eval(g)}else println("I/O Error");else println("TVDOS.SYS not found");println("Shutting down...");println("It is now safe to turn off the power")
+let p=_BIOS.FIRST_BOOTABLE_PORT;com.sendMessage(p[0],"DEVRST\x17");com.sendMessage(p[0],'OPENR"tvdos/TVDOS.SYS",'+p[1]);let r=com.getStatusCode(p[0]);if(0==r)if(com.sendMessage(p[0],"READ"),r=com.getStatusCode(p[0]),0==r){let g=com.pullMessage(p[0]);eval(g)}else println("I/O Error");else println("TVDOS.SYS not found");println("Shutting down...");println("It is now safe to turn off the power")

assets/disk0/AUTOEXEC.BAT

@@ -1,9 +1,12 @@
 echo "Starting TVDOS..."
 
 rem put set-xxx commands here:
-set PATH=\tvdos\installer;\tvdos\tuidev;$PATH
+set PATH=\tvdos\installer;\tvdos\tuidev;\tbas;\hopper\bin;$PATH
+set INCLPATH=\hopper\include;$INCLPATH
+set HELPPATH=\hopper\help;$HELPPATH
 set KEYBOARD=us_colemak
 
 rem this line specifies which shell to be presented after the boot precess:
+tvdos/i18n/korean
 zfm
 command -fancy

assets/disk0/COPYING

@@ -1,4 +1,4 @@
-Copyright (c) 2020-2024 CuriousTorvald
+Copyright (c) 2020-2026 CuriousTorvald
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal

assets/disk0/etc/motd

@@ -1,3 +1,3 @@
-TVDOS (c) 2020-2024 CuriousTorvald
+TVDOS (c) 2020-2026 CuriousTorvald
 
 TVDOS is provided "as is", without warranty of any kind; in no event shall the authors or copyright holders be liable for any claim, damages or other liabilities. Run 'less COPYING' for more information.

assets/disk0/home/config/zfmrc

@@ -0,0 +1,5 @@
+[EXEC_FUNS]
+nes,A:/home/tvnes/tvnes.js {0}
+
+[COL_HL_EXT]
+nes,156

assets/disk0/home/hdk/compile.js

@@ -1,6 +1,6 @@
 if (exec_args[1] === undefined) {
     println("Usage: compile -le/-lo myfile.js")
-    println("    The compiled and linked file will be myfile.out")
+    println("    The compiled and linked file will be myfile.exc")
     return 1
 }
 
@@ -14,7 +14,7 @@ if (exec_args[2]) {
         _G.shell.execute(`rm ${tempFilename}.gz`)
 
         _G.shell.execute(`link -${exec_args[1][2]} ${tempFilename}.bin`)
-        _G.shell.execute(`mv ${tempFilename}.out ${filenameWithoutExt}.out`)
+        _G.shell.execute(`mv ${tempFilename}.exc ${filenameWithoutExt}.exc`)
         _G.shell.execute(`rm ${tempFilename}.bin`)
 }
 // with no linking

assets/disk0/home/hdk/decompile.js

@@ -1,6 +1,6 @@
 if (exec_args[1] === undefined) {
-    println("Usage: decompile myfile.bin")
+    println("Usage: decompile myfile.exc")
-    println("The compiled file will be myfile.bin.js")
+    println("The compiled file will be myfile.exc.js")
     return 1
 }
 _G.shell.execute(`enc ${exec_args[1]} ${exec_args[1]}.gz`)

assets/disk0/home/hdk/enc.js

@@ -1,3 +1,5 @@
+// a simple, symmetric obfuscator with infinite-length key
+
 function seq(s) {
     let out = ""
     let cnt = 0

assets/disk0/home/hdk/link.js

@@ -11,7 +11,6 @@ let infile = files.open(infilePath)
 
 if (!infile.exists) throw Error("No such file: " + infilePath)
 
-let outfile = files.open(infilePath.substringBeforeLast(".") + ".out")
 let outMode = exec_args[1].toLowerCase()
 
 let type = {
@@ -21,6 +20,13 @@ let type = {
     "-c": "\x04"
 }
 
+let ext = {
+    "-r": ".exc", // executable
+    "-e": ".exc", // executable
+    "-o": ".lib", // library
+    "-c": ".cob"  // core object
+}
+
 function toI32(num) {
     const buffer = new ArrayBuffer(4)
     const view = new DataView(buffer)
@@ -40,6 +46,7 @@ let addr = 0
 if (exec_args[3] !== undefined && exec_args[3].toLowerCase() == "-a" && exec_args[4] !== undefined)
     addr = parseInt(exec_args[4], 16)
 
+let outfile = files.open(infilePath.substringBeforeLast(".") + ext[exec_args[3].toLowerCase()])
 outfile.sappend("\x20\xC0\xCC\x0A")
 outfile.sappend(type[outMode] || "\x00")
 outfile.bappend(toI24(addr))

assets/disk0/home/hdk/load.js

@@ -1,5 +1,5 @@
 if (exec_args[1] === undefined) {
-    println("Usage: load myfile.out")
+    println("Usage: load myfile.exc")
     println("   This will load the binary image onto the Core Memory")
     return 1
 }

assets/disk0/home/playrawpcm.js

@@ -4,7 +4,7 @@ music.pread(samples, 65534)
 
 audio.setPcmMode(0)
 audio.setMasterVolume(0, 255)
-audio.putPcmDataByPtr(samples, 65534, 0)
+audio.putPcmDataByPtr(0, samples, 65534, 0)
 audio.setLoopPoint(0, 65534)
 audio.play(0)*/
 
@@ -127,7 +127,7 @@ while (sampleSize > 0) {
             let readLength = (sampleSize < BLOCK_SIZE) ? sampleSize : BLOCK_SIZE
             readBytes(readLength, decodePtr)
 
-            audio.putPcmDataByPtr(decodePtr, readLength, 0)
+            audio.putPcmDataByPtr(0, decodePtr, readLength, 0)
             audio.setSampleUploadLength(0, readLength)
             audio.startSampleUpload(0)
 

assets/disk0/nettest.js

@@ -1,11 +1,13 @@
-let url="http:localhost/testnet/test.txt"
+/*let url="https:raw.githubusercontent.com/curioustorvald/hopper-mirror/refs/heads/master/aa.hop.per"
 
 let file = files.open("B:\\"+url)
 
 if (!file.exists) {
     printerrln("No such URL: "+url)
     return 1
-}
+}*/
 
-let text = file.sread()
+let net = require("A:/tvdos/include/net.mjs")
+let text = net.fetchText("https://raw.githubusercontent.com/curioustorvald/hopper-mirror/refs/heads/master/aa.hop.per")
+if (text === null) { printerrln("No such URL"); return 1 }
 println(text)

assets/disk0/tbas/basic.js

@@ -32,7 +32,7 @@ if (exec_args !== undefined && exec_args[1] !== undefined && exec_args[1].starts
     return 0
 }
 
-const THEVERSION = "1.2.1"
+const THEVERSION = "1.2.2"
 
 const PROD = true
 let INDEX_BASE = 0
@@ -4197,7 +4197,7 @@ bF.load = function(args) { // LOAD function
     if (args[1] === undefined) throw lang.missingOperand
     var fileOpened = fs.open(args[1], "R")
 
-
+    serial.printerr('load '+args[1])
     if (replUsrConfirmed || cmdbuf.length == 0) {
         if (!fileOpened) {
             fileOpened = fs.open(args[1]+".BAS", "R")
@@ -4241,7 +4241,7 @@ bF.yes = function() {
     }
 }
 bF.catalog = function(args) { // CATALOG function
-    if (args[1] === undefined) args[1] = "\\"
+    if (args[1] === undefined) args[1] = BASIC_HOME_PATH
     var pathOpened = fs.open(args[1], 'R')
     if (!pathOpened) {
         throw lang.noSuchFile
@@ -4251,6 +4251,57 @@ bF.catalog = function(args) { // CATALOG function
     com.sendMessage(port, "LIST")
     println(com.pullMessage(port))
 }
+// Load a file by absolute disk path (bypasses BASIC_HOME_PATH).
+// Used by COMPILE to fetch /tbas/compile.js.
+bF._slurpAbsolute = function(path) {
+    var port = _BIOS.FIRST_BOOTABLE_PORT
+    com.sendMessage(port[0], "FLUSH")
+    com.sendMessage(port[0], "CLOSE")
+    com.sendMessage(port[0], 'OPENR"' + path + '",' + port[1])
+    if (com.getStatusCode(port[0]) != 0) return undefined
+    com.sendMessage(port[0], "READ")
+    if (com.getStatusCode(port[0]) >= 128) return undefined
+    var s = com.pullMessage(port[0])
+    com.sendMessage(port[0], "FLUSH"); com.sendMessage(port[0], "CLOSE")
+    return s
+}
+bF.compile = function(args) { // COMPILE "OUT.JS" -- transpile cmdbuf to JS
+    if (args[1] === undefined) {
+        println("Usage: COMPILE \"out.js\""); return
+    }
+    if (cmdbuf.length === 0) {
+        println("No program loaded"); return
+    }
+    if (bS._compileImpl === undefined) {
+        // Lazy-load compile.js from /tbas/compile.js
+        var src = bF._slurpAbsolute("/tbas/compile.js")
+        if (src === undefined) {
+            println("Cannot load /tbas/compile.js")
+            return
+        }
+        try { eval(src) } catch (e) {
+            println("Failed to load compiler: " + e); return
+        }
+        if (bS._compileImpl === undefined) {
+            println("compile.js loaded but did not define bS._compileImpl"); return
+        }
+    }
+    var outpath = args[1]
+    // Strip surrounding quotes if any
+    if ((outpath.charAt(0) === '"' || outpath.charAt(0) === "'") &&
+        outpath.charAt(outpath.length - 1) === outpath.charAt(0)) {
+        outpath = outpath.substring(1, outpath.length - 1)
+    }
+    // Default to .js extension if missing
+    if (!/\.[A-Za-z0-9]+$/.test(outpath)) outpath += ".js"
+    try {
+        var n = bS._compileImpl(outpath)
+        println("Wrote " + n + " bytes to " + outpath)
+    } catch (e) {
+        serial.printerr(e + "\n" + (e.stack || ""))
+        println("Compile error: " + e)
+    }
+}
 Object.freeze(bF)
 
 if (exec_args !== undefined && exec_args[1] !== undefined) {

assets/disk0/tbas/compile.js

@@ -0,0 +1,564 @@
+// Terran BASIC -> JavaScript compiler
+// Loaded into basic.js's context by `bF.compile`. Re-uses bF._interpretLine
+// (tokeniser + elaborator + parser + pruner) verbatim and emits a self-
+// contained JS program that does its work via `let bS = require("tbas")`.
+//
+// On load, attaches `bS._compileImpl` to the live bS object.
+
+;(function() {
+
+// ---------- helpers ----------------------------------------------------------
+
+function isValidJsId(s) {
+    return /^[A-Z_][A-Z0-9_]*$/i.test(s)
+}
+function varRef(name) {
+    const u = String(name).toUpperCase()
+    return isValidJsId(u) ? `bS.__state.vars.${u}` : `bS.__state.vars[${JSON.stringify(u)}]`
+}
+function jsLit(v) { return JSON.stringify(v) }
+
+// Resolve a literal AST node down to a raw JS value at compile time. Used
+// for harvesting DATA constants. Only constant-propagatable types are
+// permitted; otherwise compile-time evaluation fails.
+function literalValue(node) {
+    if (!node) return undefined
+    switch (node.astType) {
+        case "num":    return Number(node.astValue)
+        case "string": return String(node.astValue)
+        case "bool":   return Boolean(node.astValue)
+        case "null":   return undefined
+        case "lit":    return String(node.astValue) // bare identifier in DATA: keep as string
+        default:
+            throw Error("DATA: unsupported literal node type: " + node.astType)
+    }
+}
+
+// Returns the maximum varIndex used at the immediate scope of a lambda body,
+// hence its arity.
+function lambdaArity(body) {
+    let maxIdx = -1
+    function walk(t, level) {
+        if (!t || !t.astType) return
+        if (t.astType === "defun_args" && t.astValue[0] === level) {
+            if (t.astValue[1] > maxIdx) maxIdx = t.astValue[1]
+        }
+        // descend into nested usrdefun (its body lives in astValue, not leaves)
+        if (t.astType === "usrdefun" && t.astValue && t.astValue.astLeaves !== undefined) {
+            walk(t.astValue, level + 1)
+        }
+        // generic descent
+        if (t.astLeaves) {
+            for (let i = 0; i < t.astLeaves.length; i++) walk(t.astLeaves[i], level)
+        }
+    }
+    walk(body, 0)
+    return maxIdx + 1
+}
+
+// ---------- expression lowering ---------------------------------------------
+
+// `depth` tracks the number of enclosing lambdas during emission. When we
+// emit a lambda we increment it; defun_args [d, i] becomes _aN_i where
+// N = depth - 1 - d  (the absolute lambda index of the binding scope).
+function compileExpr(tree, depth) {
+    if (tree === undefined || tree === null) return "undefined"
+
+    // Empty parens / wrapper node: descend into the single child
+    if (tree.astType === "null") {
+        if (tree.astLeaves && tree.astLeaves[0] !== undefined) return compileExpr(tree.astLeaves[0], depth)
+        return "undefined"
+    }
+    if (tree.astValue === undefined && tree.astLeaves && tree.astLeaves.length === 1) {
+        return compileExpr(tree.astLeaves[0], depth)
+    }
+
+    switch (tree.astType) {
+        case "num":    return String(Number(tree.astValue))
+        case "string": return jsLit(String(tree.astValue))
+        case "bool":   return tree.astValue ? "true" : "false"
+        case "lit":    return compileLit(tree)
+        case "defun_args": {
+            const d = tree.astValue[0], i = tree.astValue[1]
+            const scope = depth - 1 - d
+            if (scope < 0) throw Error("defun_args refers to a scope outside the program (depth=" + depth + ", d=" + d + ")")
+            return "_a" + scope + "_" + i
+        }
+        case "usrdefun": return compileLambdaExpr(tree, depth)
+        case "array":    return compileArrayRef(tree, depth)
+        case "function": return compileFunctionExpr(tree, depth)
+        case "op":       return compileOpExpr(tree, depth)
+        default:
+            throw Error("Cannot compile expression node of type: " + tree.astType + " (value=" + tree.astValue + ")")
+    }
+}
+
+function compileLit(tree) {
+    const name = String(tree.astValue).toUpperCase()
+    // Built-in zero-arg / pass-as-value functions: when a builtin name is
+    // referenced as a value (e.g. assigned to a variable for later use as a
+    // higher-order arg), emit a JS function reference. For a plain variable
+    // read, emit the vars table lookup.
+    // Heuristic: if the name matches a builtin we know about, prefer the
+    // function; otherwise, vars lookup.
+    if (RUNTIME_BUILTINS.has(name)) {
+        return "bS." + (isValidJsId(name) ? name : `[${jsLit(name)}]`)
+    }
+    return varRef(name)
+}
+
+function compileArrayRef(tree, depth) {
+    // tree.astValue = array variable name; tree.astLeaves = index expressions
+    if (!tree.astLeaves || tree.astLeaves.length === 0) {
+        return varRef(tree.astValue)
+    }
+    const indices = tree.astLeaves.map(l => compileExpr(l, depth))
+    return `bS.__arrGet(${varRef(tree.astValue)}, [${indices.join(",")}])`
+}
+
+function compileFunctionExpr(tree, depth) {
+    const name = String(tree.astValue).toUpperCase()
+
+    if (name === "PRINT" || name === "EMIT") {
+        // PRINT/EMIT used as expression — emit as IIFE returning undefined
+        return "(" + compilePrintLike(tree, name, depth) + ", undefined)"
+    }
+    // user function call by name: <varname>(args)  — when astType is "function"
+    // and astValue is a string that matches a variable, the parser may have
+    // generated this. Treat it as: invoke the var.
+    if (!RUNTIME_BUILTINS.has(name)) {
+        // Not a known builtin: treat as a user defined function call
+        const args = (tree.astLeaves || []).map(l => compileExpr(l, depth))
+        return `bS.__runFn(${varRef(name)}, [${args.join(",")}])`
+    }
+
+    const args = (tree.astLeaves || []).map(l => compileExpr(l, depth))
+    return `bS.${isValidJsId(name) ? name : `[${jsLit(name)}]`}(${args.join(",")})`
+}
+
+const ARITH_OP = {
+    "+":  (l,r) => `bS.__add(${l},${r})`,
+    "-":  (l,r) => `((${l})-(${r}))`,
+    "*":  (l,r) => `((${l})*(${r}))`,
+    "/":  (l,r) => `bS.__div(${l},${r})`,
+    "\\": (l,r) => `bS.__intdiv(${l},${r})`,
+    "MOD":(l,r) => `bS.__mod(${l},${r})`,
+    "^":  (l,r) => `bS.__pow(${l},${r})`,
+    "==": (l,r) => `((${l})==(${r}))`,
+    "<>": (l,r) => `((${l})!=(${r}))`,
+    "><": (l,r) => `((${l})!=(${r}))`,
+    "<":  (l,r) => `((${l})<(${r}))`,
+    ">":  (l,r) => `((${l})>(${r}))`,
+    "<=": (l,r) => `((${l})<=(${r}))`,
+    "=<": (l,r) => `((${l})<=(${r}))`,
+    ">=": (l,r) => `((${l})>=(${r}))`,
+    "=>": (l,r) => `((${l})>=(${r}))`,
+    "AND":(l,r) => `bS.AND(${l},${r})`,
+    "OR": (l,r) => `bS.OR(${l},${r})`,
+    "<<": (l,r) => `((${l})<<(${r}))`,
+    ">>": (l,r) => `((${l})>>>(${r}))`,
+    "BAND":(l,r) => `((${l})&(${r}))`,
+    "BOR": (l,r) => `((${l})|(${r}))`,
+    "BXOR":(l,r) => `((${l})^(${r}))`,
+}
+const UNARY_OP = {
+    "UNARYMINUS":   (a) => `(-(${a}))`,
+    "UNARYPLUS":    (a) => `(+(${a}))`,
+    "UNARYLOGICNOT":(a) => `(!(${a}))`,
+    "UNARYBNOT":    (a) => `(~(${a}))`,
+}
+
+function compileOpExpr(tree, depth) {
+    const op = String(tree.astValue)
+    const leaves = tree.astLeaves || []
+
+    // Unary
+    if (UNARY_OP[op] && (leaves.length === 1 || leaves[1] === undefined)) {
+        return UNARY_OP[op](compileExpr(leaves[0], depth))
+    }
+
+    // Binary arithmetic / comparison / logic
+    if (ARITH_OP[op] && leaves.length === 2) {
+        return ARITH_OP[op](compileExpr(leaves[0], depth), compileExpr(leaves[1], depth))
+    }
+
+    // Generator / range
+    if (op === "TO" && leaves.length === 2) {
+        return `new bS.__ForGen(${compileExpr(leaves[0], depth)}, ${compileExpr(leaves[1], depth)}, 1)`
+    }
+    if (op === "STEP" && leaves.length === 2) {
+        return `bS.STEP(${compileExpr(leaves[0], depth)}, ${compileExpr(leaves[1], depth)})`
+    }
+
+    // List ops
+    if ((op === "!" || op === "~" || op === "#") && leaves.length === 2) {
+        const fn = (op === "!") ? "['!']" : (op === "~") ? "['~']" : "['#']"
+        return `bS${fn}(${compileExpr(leaves[0], depth)}, ${compileExpr(leaves[1], depth)})`
+    }
+
+    // Assignment as expression — returns the assigned value
+    if (op === "=" && leaves.length === 2) {
+        return "(" + compileAssignExpr(tree, depth) + ")"
+    }
+    if (op === "IN" && leaves.length === 2) {
+        // Used inside FOR/FOREACH; compileFor unwraps these. As a value, treat
+        // as { asgnVarName, asgnValue } so a stray IN still works.
+        const name = jsLit(String(leaves[0].astValue).toUpperCase())
+        const rhs = compileExpr(leaves[1], depth)
+        return `({asgnVarName: ${name}, asgnValue: ${rhs}})`
+    }
+
+    // Functional / monad ops
+    if ((op === ">>=" || op === ">>~" || op === "." || op === "$" ||
+         op === "&"   || op === "~<"  || op === "<*>" || op === "<$>" ||
+         op === "<~>") && leaves.length === 2) {
+        return `bS[${jsLit(op)}](${compileExpr(leaves[0], depth)}, ${compileExpr(leaves[1], depth)})`
+    }
+    if (op === "@" && leaves.length === 1) {
+        // Monad return as prefix
+        return `bS.MRET(${compileExpr(leaves[0], depth)})`
+    }
+    if (op === "~>") {
+        throw Error("Compiler: bare ~> survived prune (should be usrdefun)")
+    }
+
+    throw Error("Cannot compile op '" + op + "' with " + leaves.length + " operand(s)")
+}
+
+function compileLambdaExpr(tree, depth) {
+    // tree.astType === "usrdefun"; tree.astValue holds the body AST; if
+    // tree.astLeaves is non-empty, this is an immediate application.
+    const body = tree.astValue
+    if (!body || !body.astType) throw Error("Malformed usrdefun")
+
+    const arity = lambdaArity(body)
+    const newDepth = depth + 1
+    const params = []
+    for (let i = 0; i < arity; i++) params.push("_a" + (newDepth - 1) + "_" + i)
+    const bodyJs = compileExpr(body, newDepth)
+    const arrow = `((${params.join(",")}) => (${bodyJs}))`
+
+    if (tree.astLeaves && tree.astLeaves.length > 0) {
+        const args = tree.astLeaves.map(l => compileExpr(l, depth))
+        return `${arrow}(${args.join(",")})`
+    }
+    return arrow
+}
+
+function compileAssignExpr(tree, depth) {
+    // op "=" with leaves[0] as target, leaves[1] as RHS
+    const lhs = tree.astLeaves[0]
+    const rhs = compileExpr(tree.astLeaves[1], depth)
+
+    if (lhs.astType === "lit") {
+        const name = String(lhs.astValue).toUpperCase()
+        return `(${varRef(name)} = ${rhs})`
+    }
+    // The parser emits "function" or "array" for `A(i,j) = ...` — both mean
+    // "store into element of A".
+    if (lhs.astType === "array" || lhs.astType === "function") {
+        const indices = lhs.astLeaves.map(l => compileExpr(l, depth))
+        return `(bS.__arrSet(${varRef(lhs.astValue)}, [${indices.join(",")}], ${rhs}), ${rhs})`
+    }
+    throw Error("Cannot assign to LHS of type " + lhs.astType)
+}
+
+// ---------- statement lowering ----------------------------------------------
+
+function compilePrintLike(tree, fname, depth) {
+    const leaves = (tree.astLeaves || []).slice()
+    const seps = (tree.astSeps || []).slice()
+
+    let suppressNewline = false
+    if (leaves.length > 0 && leaves[leaves.length - 1] !== undefined &&
+        leaves[leaves.length - 1].astType === "null") {
+        suppressNewline = true
+        leaves.pop()
+    }
+
+    const valueExprs = leaves.map(l => compileExpr(l, depth))
+    if (suppressNewline) valueExprs.push("bS.__PRINT_NONL")
+    const sepArr = seps.slice(0, leaves.length - 1)
+
+    return `bS.${fname}([${valueExprs.join(", ")}], ${jsLit(sepArr)})`
+}
+
+function setPc(pc) {
+    if (pc[0] === Infinity) return "pc=[Infinity,0];"
+    return "pc=[" + pc[0] + "," + pc[1] + "];"
+}
+
+function compileStatement(tree, lnum, stmt, nextPc) {
+    if (!tree) return setPc(nextPc)
+    if (tree.astType === "null" && tree.astLeaves && tree.astLeaves[0]) {
+        return compileStatement(tree.astLeaves[0], lnum, stmt, nextPc)
+    }
+
+    const isFn = (tree.astType === "function" || tree.astType === "op")
+    const fname = isFn ? String(tree.astValue).toUpperCase() : null
+
+    switch (fname) {
+    case "GOTO": {
+        const target = compileGotoTarget(tree.astLeaves[0])
+        return `pc=${target};`
+    }
+    case "GOSUB": {
+        const target = compileGotoTarget(tree.astLeaves[0])
+        return `gosubStack.push([${nextPc[0]},${nextPc[1]}]); pc=${target};`
+    }
+    case "RETURN":
+        return `pc=gosubStack.pop(); if(!pc) throw new Error("RETURN without GOSUB");`
+    case "END":
+        return "pc=[Infinity,0];"
+    case "IF":
+        return compileIf(tree, lnum, stmt, nextPc)
+    case "ON":
+        return compileOn(tree, lnum, stmt, nextPc)
+    case "FOR":
+    case "FOREACH":
+        return compileFor(tree, lnum, stmt, nextPc, fname === "FOREACH")
+    case "NEXT":
+        return compileNext(tree, lnum, stmt, nextPc)
+    case "READ": {
+        const target = tree.astLeaves[0]
+        if (target.astType !== "lit") throw Error("READ: target must be a variable")
+        return `${varRef(target.astValue)}=bS.__readData(); ${setPc(nextPc)}`
+    }
+    case "RESTORE":
+        return `bS.__state.dataCursor=0; ${setPc(nextPc)}`
+    case "DATA":
+    case "LABEL":
+        return setPc(nextPc) // harvested at compile time
+    case "DIM":
+        return compileDim(tree, lnum, stmt, nextPc)
+    case "PRINT":
+    case "EMIT":
+        return `${compilePrintLike(tree, fname, 0)}; ${setPc(nextPc)}`
+    case "OPTIONBASE":
+        return `bS.OPTIONBASE(${compileExpr(tree.astLeaves[0], 0)}); ${setPc(nextPc)}`
+    case "OPTIONDEBUG":
+        return `bS.OPTIONDEBUG(${compileExpr(tree.astLeaves[0], 0)}); ${setPc(nextPc)}`
+    case "OPTIONTRACE":
+        return `bS.OPTIONTRACE(${compileExpr(tree.astLeaves[0], 0)}); ${setPc(nextPc)}`
+    case "INPUT": {
+        // INPUT <var> -> read into var
+        const target = tree.astLeaves[tree.astLeaves.length - 1]
+        if (target.astType !== "lit") throw Error("INPUT: target must be a variable")
+        return `${varRef(target.astValue)}=bS.INPUT(); ${setPc(nextPc)}`
+    }
+    case "=":
+        return `${compileAssignExpr(tree, 0)}; ${setPc(nextPc)}`
+    case "IN":
+        // bare IN as a statement is unusual but harmless
+        return `${compileExpr(tree, 0)}; ${setPc(nextPc)}`
+    case "REM":
+        return setPc(nextPc)
+    }
+
+    // Default: evaluate as an expression for side effect, then advance
+    return `${compileExpr(tree, 0)}; ${setPc(nextPc)}`
+}
+
+function compileGotoTarget(leaf) {
+    // Always route through __resolveTarget so non-existent line numbers snap
+    // upward to the next existing line — matching basic.js's main loop,
+    // which increments lnum until it finds a populated cmdbuf entry.
+    if (leaf.astType === "num") return `bS.__resolveTarget(${Number(leaf.astValue)})`
+    if (leaf.astType === "string") return `bS.__resolveTarget(${jsLit(leaf.astValue)})`
+    if (leaf.astType === "lit") {
+        const name = String(leaf.astValue)
+        return `bS.__resolveTarget(bS.__state.gotoLabels[${jsLit(name)}]!==undefined ? ${jsLit(name)} : ${varRef(name)})`
+    }
+    return `bS.__resolveTarget(${compileExpr(leaf, 0)})`
+}
+
+function compileIf(tree, lnum, stmt, nextPc) {
+    const test = compileExpr(tree.astLeaves[0], 0)
+    const thenStmt = compileStatement(tree.astLeaves[1], lnum, stmt, nextPc)
+    const elseStmt = (tree.astLeaves[2])
+        ? compileStatement(tree.astLeaves[2], lnum, stmt, nextPc)
+        : setPc(nextPc)
+    return `if(bS.__test(${test})){${thenStmt}}else{${elseStmt}}`
+}
+
+function compileOn(tree, lnum, stmt, nextPc) {
+    // children: testExpr, jumpFnLit, target0, target1, ...
+    const testExpr = compileExpr(tree.astLeaves[0], 0)
+    const jmpFn    = String(tree.astLeaves[1].astValue).toUpperCase()
+    const targets  = tree.astLeaves.slice(2)
+
+    const cases = targets.map((t, i) => {
+        const tgt = compileGotoTarget(t)
+        if (jmpFn === "GOSUB") {
+            return `case ${i}: gosubStack.push([${nextPc[0]},${nextPc[1]}]); pc=${tgt}; break;`
+        }
+        return `case ${i}: pc=${tgt}; break;`
+    })
+    return `{const _o=(${testExpr})-bS.__state.indexBase; switch(_o){${cases.join(" ")} default: ${setPc(nextPc)}}}`
+}
+
+function compileFor(tree, lnum, stmt, nextPc, isForEach) {
+    const child = tree.astLeaves[0]
+    if (child.astType !== "op" || (child.astValue !== "=" && child.astValue !== "IN")) {
+        throw Error("FOR/FOREACH: expected = or IN, got " + child.astType + ":" + child.astValue)
+    }
+    const varname = String(child.astLeaves[0].astValue).toUpperCase()
+    let iter = compileExpr(child.astLeaves[1], 0)
+    if (isForEach) {
+        // ensure we coerce generators into arrays for FOREACH semantics
+        iter = `(function(_x){return bS.__isGenerator(_x)?bS.__genToArray(_x):_x})(${iter})`
+    }
+    // Pass nextPc — the PC of the loop body's first statement — so NEXT can
+    // jump straight back without relying on fall-through.
+    return `bS.__forSetup(${jsLit(varname)}, ${iter}, ${nextPc[0]}, ${nextPc[1]}); ${setPc(nextPc)}`
+}
+
+function compileNext(tree, lnum, stmt, nextPc) {
+    let argExpr = "undefined"
+    const leaves = tree.astLeaves || []
+    if (leaves.length === 1 && leaves[0] && leaves[0].astType === "lit") {
+        argExpr = jsLit(String(leaves[0].astValue).toUpperCase())
+    }
+    return `{const _n=bS.__forNext(${argExpr}); if(_n){pc=_n;}else{${setPc(nextPc)}}}`
+}
+
+function compileDim(tree, lnum, stmt, nextPc) {
+    // tree.astLeaves contains array constructor calls: each leaf is either
+    //   an `array` node OR a `function` node (the parser doesn't distinguish
+    //   `A(5)` from a function call until runtime). astValue is the variable
+    //   name and astLeaves are the dimension expressions.
+    const stmts = []
+    for (let i = 0; i < tree.astLeaves.length; i++) {
+        const leaf = tree.astLeaves[i]
+        if (leaf.astType !== "array" && leaf.astType !== "function") {
+            throw Error("DIM: expected array decl, got " + leaf.astType)
+        }
+        const name = String(leaf.astValue).toUpperCase()
+        const dims = leaf.astLeaves.map(l => compileExpr(l, 0))
+        stmts.push(`${varRef(name)}=bS.__dim([${dims.join(",")}]);`)
+    }
+    return stmts.join(" ") + " " + setPc(nextPc)
+}
+
+// ---------- top-level entry --------------------------------------------------
+
+// Set of builtin names exposed by tbas.mjs. Used to decide whether a `lit`
+// in expression position is a variable or a function reference.
+const RUNTIME_BUILTINS = new Set([
+    "PRINT","EMIT","INPUT","CIN",
+    "ABS","SGN","INT","FLOOR","CEIL","FIX","ROUND","SQR","CBR",
+    "SIN","COS","TAN","ASN","ACO","ATN","SINH","COSH","TANH",
+    "EXP","LOG","MIN","MAX","RND",
+    "SPC","LEFT","RIGHT","MID","CHR",
+    "LEN","HEAD","TAIL","INIT","LAST","MAP","FOLD","FILTER","ARRAY",
+    "CLS","CLPX","PLOT","GOTOYX","TEXTFORE","TEXTBACK",
+    "POKE","PEEK","GETKEYSDOWN","CPUT","CGET","CSTA",
+    "TYPEOF","OPTIONBASE","OPTIONDEBUG","OPTIONTRACE",
+    "MRET","MLIST","MJOIN",
+    "AND","OR","NOT",
+    "DO","CLEAR","END","TO","STEP",
+    "FOR","FOREACH","NEXT","IF","ON","GOTO","GOSUB","RETURN",
+    "DIM","DATA","READ","RESTORE","LABEL","REM",
+    "TEST",
+])
+
+bS._compileImpl = function(outpath) {
+    if (typeof cmdbuf === "undefined") throw Error("compile.js: cmdbuf not available")
+    if (typeof bF === "undefined")     throw Error("compile.js: bF not available")
+    if (typeof bF._interpretLine !== "function") throw Error("compile.js: bF._interpretLine not available")
+
+    // Reset parser-side state so we don't pollute the live interpreter
+    if (typeof lambdaBoundVars !== "undefined") lambdaBoundVars.length = 0
+    const savedPrescan = (typeof prescan !== "undefined") ? prescan : false
+    if (typeof prescan !== "undefined") prescan = true   // suppress execution of LABEL/DATA prescan side-effects
+
+    // ---- pass 1: parse every line ----
+    const programTrees = []   // [lnum] -> array of statements
+    for (let lnum = 0; lnum < cmdbuf.length; lnum++) {
+        const linestr = cmdbuf[lnum]
+        if (linestr === undefined) continue
+        const trees = bF._interpretLine(lnum, String(linestr).trim())
+        if (trees !== undefined) programTrees[lnum] = trees
+    }
+    if (typeof prescan !== "undefined") prescan = savedPrescan
+
+    // ---- pass 2: ordered list of populated lnums and successor table ----
+    const linenums = []
+    for (let lnum = 0; lnum < programTrees.length; lnum++) {
+        if (programTrees[lnum] !== undefined) linenums.push(lnum)
+    }
+
+    function nextPcOf(idx, stmtIdx) {
+        const lnum = linenums[idx]
+        const stmts = programTrees[lnum]
+        if (stmtIdx + 1 < stmts.length) return [lnum, stmtIdx + 1]
+        if (idx + 1 < linenums.length)  return [linenums[idx + 1], 0]
+        return [Infinity, 0]
+    }
+
+    // ---- pass 3: harvest DATA constants and LABEL definitions ----
+    const dataConsts = []
+    const labelMap = {}
+    for (let i = 0; i < linenums.length; i++) {
+        const lnum = linenums[i]
+        const stmts = programTrees[lnum]
+        for (let s = 0; s < stmts.length; s++) {
+            const t = stmts[s]
+            if (!t) continue
+            if (t.astValue === "DATA") {
+                for (let k = 0; k < t.astLeaves.length; k++) {
+                    dataConsts.push(literalValue(t.astLeaves[k]))
+                }
+            } else if (t.astValue === "LABEL") {
+                const lblNode = t.astLeaves[0]
+                if (!lblNode) throw Error("LABEL with no name on line " + lnum)
+                const lblName = String(lblNode.astValue)
+                labelMap[lblName] = [lnum, s]
+            }
+        }
+    }
+
+    // ---- pass 4: emit case bodies ----
+    const cases = []
+    for (let i = 0; i < linenums.length; i++) {
+        const lnum = linenums[i]
+        const stmts = programTrees[lnum]
+        for (let s = 0; s < stmts.length; s++) {
+            const next = nextPcOf(i, s)
+            const body = compileStatement(stmts[s], lnum, s, next)
+            cases.push(`    case ${lnum}*32+${s}: { ${body} break; }`)
+        }
+    }
+
+    // ---- pass 5: assemble final output ----
+    const firstPc = (linenums.length > 0) ? `[${linenums[0]},0]` : `[Infinity,0]`
+    const labelMapJs = "{" + Object.keys(labelMap).map(k =>
+        `${jsLit(k)}: [${labelMap[k][0]}, ${labelMap[k][1]}]`
+    ).join(", ") + "}"
+
+    const out =
+`// Compiled by Terran BASIC -> JS compiler (assets/disk0/tbas/compile.js)
+// Source line count: ${linenums.length}
+let bS = require("tbas")
+bS.__reset()
+bS.__data(${jsLit(dataConsts)})
+bS.__labels(${labelMapJs})
+bS.__setLines(${jsLit(linenums)})
+let pc = ${firstPc}
+const gosubStack = []
+while (pc[0] !== Infinity) {
+  switch (pc[0]*32 + pc[1]) {
+${cases.join("\n")}
+    default: pc = [Infinity, 0]; break;
+  }
+}
+`
+
+    // ---- write to disk via basic.js's fs (writes under BASIC_HOME_PATH) ----
+    const opened = fs.open(outpath, "W")
+    if (!opened) throw Error("Cannot open " + outpath + " for writing")
+    fs.write(out)
+    return out.length
+}
+
+})();

assets/disk0/tracker_play.js

@@ -0,0 +1,21 @@
+const taud = require("taud")
+
+const fullFilePath = _G.shell.resolvePathInput(exec_args[1])
+if (fullFilePath === undefined) {
+    println(`Usage: ${exec_args[0]} path_to.taud`)
+    return 1
+}
+
+const PLAYHEAD = 0
+
+println("Playing "+fullFilePath.full)
+
+audio.resetParams(PLAYHEAD)
+audio.purgeQueue(PLAYHEAD)
+audio.stop(PLAYHEAD)
+
+taud.uploadTaudFile(fullFilePath.full, 0, PLAYHEAD)
+audio.setMasterVolume(PLAYHEAD, 255)
+audio.setMasterPan(PLAYHEAD, 128)
+audio.setCuePosition(PLAYHEAD, 0)
+audio.play(PLAYHEAD)

assets/disk0/tracker_test.js

@@ -0,0 +1,186 @@
+// Tracker Mode — Bach's Prelude in C Major (BWV 846)
+// Run from the TVDOS shell: js tracker_test.js
+// Uploads ~92 patterns on startup (takes a moment).
+
+// -- Note table (12-TET, 4096-TET encoding) ------------------------------------
+// C3 = 0x4000; each semitone = 4096/12 ≈ 341.33 steps; each octave = 4096 steps.
+// Sharp suffix: s (e.g. Cs3); flat aliases also provided (e.g. Db3 = Cs3).
+// Special values: Note.OFF = key-off, Note.CUT = note cut, Note.NOP = no-op.
+var Note = (function() {
+    var SEMITONE = 4096 / 12;
+    var C3 = 0x4000;
+    function n(oct, semi) { return Math.round(C3 + (oct - 3) * 4096 + semi * SEMITONE) & 0xFFFF; }
+    var t = {};
+    var names = ['C','Cs','D','Ds','E','F','Fs','G','Gs','A','As','B'];
+    var flats  = ['C','Db','D','Eb','E','F','Gb','G','Ab','A','Bb','B'];
+    for (var oct = 0; oct <= 9; oct++) {
+        for (var s = 0; s < 12; s++) {
+            t[names[s] + oct] = n(oct, s);
+            if (flats[s] !== names[s]) t[flats[s] + oct] = n(oct, s);
+        }
+    }
+    t.NOP = 0x0000;   // no-op (empty row)
+    t.OFF = 0x0001;   // key-off
+    t.CUT = 0x0002;   // note cut (immediate)
+    return t;
+}());
+
+var PLAYHEAD = 0;
+
+// -- 1. Sample: triangle wave (256 samples @ C3) --------------------------------
+var SAMPLE_LEN = 256;
+var sampleBytes = new Array(SAMPLE_LEN);
+for (var i = 0; i < SAMPLE_LEN; i++) {
+    var phase = (i / SAMPLE_LEN) * 2.0;
+    var val_ = phase < 1.0 ? phase : 2.0 - phase;
+    sampleBytes[i] = Math.round(val_ * 254) & 0xFF;
+}
+var memBase = audio.getMemAddr();
+for (var i = 0; i < SAMPLE_LEN; i++) {
+    sys.poke(memBase - i, sampleBytes[i]);
+}
+
+// -- 2. Instrument 0 -----------------------------------------------------------
+var instBytes = new Array(64).fill(0);
+instBytes[2] = 0; instBytes[3] = 1;        // sampleLength = 256
+instBytes[4] = 0x00; instBytes[5] = 0x7D;  // samplingRate = 32000
+instBytes[10] = 0x00; instBytes[11] = 0x01;  // sampleLoopEnd = 256 (whole sample)
+instBytes[12] = 1;                           // loopMode = 1 (forward)
+instBytes[16] = 255; instBytes[17] = 0;     // envelope: vol=255, hold
+audio.uploadInstrument(1, instBytes);
+
+// -- 3. Piano-roll builder -----------------------------------------------------
+// Source convention: C1=0, C2=12, C3=24, C4=36 (i.e. C3=24, octave every 12).
+function midiToTsvm(n) {
+    var oct = Math.floor(n / 12) + 1;
+    return Math.round(0x3000 + oct * 4096 + (n % 12) * (4096 / 12)) & 0xFFFF;
+}
+
+var noteMap = {};  // absRow → TSVM note value
+var rowCursor = 0;
+
+function seq(notes, lens) {
+    for (var i = 0; i < notes.length; i++) {
+        noteMap[rowCursor] = midiToTsvm(notes[i]);
+        rowCursor += lens[i];
+    }
+}
+
+var TD = 3;  // rows per note step (= source TICK_DIVISOR)
+
+function prel(n1, n2, n3, n4, n5) {
+    seq([n1, n2, n3, n4, n5, n3, n4, n5, n1, n2, n3, n4, n5, n3, n4, n5],
+        [TD+2, TD, TD, TD-1, TD, TD, TD, TD, TD, TD, TD, TD-1, TD, TD, TD, TD]);
+}
+function end1(n1,n2,n3,n4,n5,n6,n7,n8,n9) {
+    seq([n1, n2, n3, n4, n5, n6, n5, n4, n5, n7, n8, n7, n8, n9, n8, n9],
+        [TD+2, TD, TD, TD-1, TD, TD, TD, TD, TD, TD, TD, TD-1, TD, TD, TD, TD]);
+}
+function end2(n1,n2,n3,n4,n5,n6,n7,n8,n9) {
+    seq([n1, n2, n3, n4, n5, n6, n5, n4, n5, n4, n3, n4, n7, n8, n9, n7],
+        [TD+2, TD+1, TD+1, TD+1, TD+1, TD+2, TD+2, TD+2,
+         TD+3, TD+3, TD+4, TD+4, TD+6, TD+8, TD+12, TD+24]);
+}
+function end3(ns) {
+    for (var i = 0; i < ns.length; i++) {
+        noteMap[rowCursor] = midiToTsvm(ns[i]);
+        rowCursor += 1;
+    }
+    for (var i = 0; i < TD*2; i++) {
+        noteMap[rowCursor] = Note.NOP
+        rowCursor += 1;
+    }
+}
+
+// -- 4. Build the piece --------------------------------------------------------
+rowCursor = 16 * TD;  // 160-row intro silence
+
+prel(24,28,31,36,40);
+prel(24,26,33,38,41);
+prel(23,26,31,38,41);
+prel(24,28,31,36,40);
+prel(24,28,33,40,45);
+prel(24,26,30,33,38);
+prel(23,26,31,38,43);
+prel(23,24,28,31,36);
+prel(21,24,28,31,36);
+prel(14,21,26,30,36);
+prel(19,23,26,31,35);
+prel(19,22,28,31,37);
+prel(17,21,26,33,38);
+prel(17,20,26,29,35);
+prel(16,19,24,31,36);
+prel(16,17,21,24,29);
+prel(14,17,21,24,29);
+prel( 7,14,19,23,29);
+prel(12,16,19,24,28);
+prel(12,19,22,24,28);
+prel( 5,17,21,24,28);
+prel( 6,12,21,24,27);
+prel( 8,17,23,24,26);
+prel( 7,17,19,23,26);
+prel( 7,16,19,24,28);
+prel( 7,14,19,24,29);
+prel( 7,14,19,23,29);
+prel( 7,15,21,24,30);
+prel( 7,16,19,24,31);
+prel( 7,14,19,24,29);
+prel( 7,14,19,23,29);
+prel( 0,12,19,22,28);
+end1( 0,12,17,21,24,29,21,17,14);
+end2( 0,11,31,35,38,41,26,29,28);
+end3([0,12,28,31,36]);
+
+noteMap[rowCursor] = Note.OFF;    // key-off at start of final silence
+rowCursor += 16 * TD - 5;         // 155 more rows of silence
+
+var totalRows = rowCursor;         // 5836
+var NUM_ROWS = 64;
+var numPatterns = Math.ceil(totalRows / NUM_ROWS);  // 92
+
+// -- 5. Build and upload patterns ----------------------------------------------
+for (var p = 0; p < numPatterns; p++) {
+    var patBytes = new Array(512).fill(0);
+    for (var r = 0; r < NUM_ROWS; r++) {
+        var absRow = p * NUM_ROWS + r;
+        var noteVal = (noteMap[absRow] !== undefined) ? noteMap[absRow] : Note.NOP;
+        var isOn = (noteVal !== Note.NOP && noteVal !== Note.OFF && noteVal !== Note.CUT);
+        var off = r * 8;
+        patBytes[off]     = noteVal & 0xFF;
+        patBytes[off + 1] = (noteVal >> 8) & 0xFF;
+        patBytes[off + 2] = 1;              // instrument 1
+        patBytes[off + 3] = 63;  // volume
+        patBytes[off + 4] = 31;  // pan (centre)
+    }
+    audio.uploadPattern(p, patBytes);
+}
+
+// -- 6. Cue sheet: one entry per pattern, last halts -------------------------
+// Cue format: 32 bytes, 20 voices with 12-bit pattern numbers packed as:
+//   bytes 0-9:  low nybbles (byte i = voice i*2 in hi-nybble, voice i*2+1 in lo-nybble)
+//   bytes 10-19: mid nybbles (same packing)
+//   bytes 20-29: high nybbles (same packing)
+//   byte 30: instruction (0=NOP, 1=Halt)
+// Voice 0 plays pattern c; voices 1-19 are disabled (0xFFF).
+for (var c = 0; c < numPatterns; c++) {
+    var cueBytes = new Array(32).fill(0xFF);
+    // voice 0 = c (12-bit), voice 1 = 0xFFF → byte0=(c&0xF)<<4|0xF
+    cueBytes[0]  = ((c & 0xF) << 4) | 0xF;           // lo nybbles v0,v1
+    cueBytes[10] = (((c >> 4) & 0xF) << 4) | 0xF;    // mid nybbles v0,v1
+    cueBytes[20] = (((c >> 8) & 0xF) << 4) | 0xF;    // hi nybbles v0,v1
+    cueBytes[30] = (c === numPatterns - 1) ? 0x01 : 0;
+    audio.uploadCue(c, cueBytes);
+}
+
+// -- 7. Playback ---------------------------------------------------------------
+// BPM=500, tickRate=1: 1 row = 5 ms; 10 rows/step × 16 steps/bar ≈ 75 bars/min.
+audio.setTrackerMode(PLAYHEAD);
+audio.setBPM(PLAYHEAD, 250);
+audio.setTickRate(PLAYHEAD, 6);
+audio.setMasterVolume(PLAYHEAD, 255);
+audio.setMasterPan(PLAYHEAD, 128);
+audio.setCuePosition(PLAYHEAD, 0);
+audio.play(PLAYHEAD);
+
+println("Bach's Prelude in C Major -- " + numPatterns + " patterns loaded.");
+println("Stop: audio.stop(" + PLAYHEAD + ")");

assets/disk0/tvdos/TVDOS.SYS

@@ -55,10 +55,12 @@ class PmemFSfile {
         // string representation (preferable)
         if (typeof bytes === 'string' || bytes instanceof String) {
             this.data = bytes
+            this.length = bytes.length
         }
         // Javascript array OR JVM byte[]
         else if (Array.isArray(bytes) || bytes.toString().startsWith("[B")) {
-            this.bdata = bytes[i]
+            this.bdata = bytes
+            this.length = bytes.length
         }
         else {
             throw Error("Invalid type for directory")
@@ -76,10 +78,10 @@ class PmemFSfile {
 
     dataAsBytes() {
         if (this.bdata !== undefined) return this.bdata
-        this.bdata = new Int8Array(this.data.length)
+        this.bdata = new Uint8Array(this.data.length)
         for (let i = 0; i < this.data.length; i++) {
             let p = this.data.charCodeAt(i)
-            this.bdata[i] = (p > 127) ? p - 255 : p
+            this.bdata[i] = p
         }
         return this.bdata
     }
@@ -147,10 +149,12 @@ _TVDOS.variables = {
     LANG: "EN",
     KEYBOARD: "us_qwerty",
     PATH: "\\tvdos\\bin;\\home",
-    PATHEXT: ".com;.bat;.app;.js",
+    INCLPATH: "\\tvdos\\include;\\home",
+    PATHEXT: ".com;.bat;.app;.js;.alias",
     HELPPATH: "\\tvdos\\help",
     OS_NAME: "TSVM Disk Operating System",
-    OS_VERSION: _TVDOS.VERSION
+    OS_VERSION: _TVDOS.VERSION,
+    USERCONFIGPATH: "\\home\\config",
 };
 Object.freeze(_TVDOS);
 
@@ -162,16 +166,16 @@ class TVDOSFileDescriptor {
 
     constructor(path0, driverID) {
         if (path0.startsWith("$")) {
-            let path1 = path0.substring(3)
+            let path1 = path0.replaceAll("/", "\\").substring(3)
-            let slashPos = path1.indexOf("/")
+            let slashPos = path1.indexOf("\\")
             let devName = path1.substring(0, (slashPos < 0) ? path1.length : slashPos)
 
             if (!files.reservedNames.includes(devName)) {
                 throw Error(`${devName} is not a valid device file`)
             }
 
-            this._driveLetter = undefined
+            this._driveLetter = '$'
-            this._path = path0
+            this._path = '\\' + path1
             this._driverID = `DEV${devName}`
             this._driver = _TVDOS.DRV.FS[`DEV${devName}`] // can't just put `driverID` here
         }
@@ -225,8 +229,9 @@ class TVDOSFileDescriptor {
     }
 
     /** reads the file bytewise and puts it to the specified memory address
-     * @param count optional -- how many bytes to read
+     * @param ptr -- where the bytes should be dumped
-     * @param offset optional -- how many bytes to skip initially
+     * @param count -- how many bytes to read
+     * @param offset -- how many bytes to skip initially from the file
      */
     pread(ptr, count, offset) {
         this.driver.pread(this, ptr, count, offset)
@@ -241,7 +246,9 @@ class TVDOSFileDescriptor {
     }
 
     /** writes the bytes stored in the memory[ptr .. ptr+count-1] to file[offset .. offset+count-1]
-     * - @param offset is optional
+     * @param ptr -- where the bytes are
+     * @param count -- how many bytes to write
+     * @param offset -- position in the file
      */
     pwrite(ptr, count, offset) {
         this.driver.pwrite(this, ptr, count, offset)
@@ -420,11 +427,11 @@ _TVDOS.DRV.FS.SERIAL.sread = (fd) => {
 }
 _TVDOS.DRV.FS.SERIAL.bread = (fd) => {
     let str = _TVDOS.DRV.FS.SERIAL.sread(fd)
-    let bytes = new Int8Array(str.length)
+    let bytes = []//new Int8Array(str.length)
     for (let i = 0; i < str.length; i++) {
 //        let p = str.charCodeAt(i)
 //        bytes[i] = (p > 127) ? p - 255 : p
-        bytes[i] = str.charCodeAt(i)
+        bytes.push(str.charCodeAt(i))
     }
     return bytes
 }
@@ -870,11 +877,21 @@ Object.freeze(_TVDOS.DRV.FS.DEVPT)
 _TVDOS.DRV.FS.DEVFBIPF = {}
 
 _TVDOS.DRV.FS.DEVFBIPF.pwrite = (fd, infilePtr, count, _2) => {
-    let decodefun = ([graphics.decodeIpf1, graphics.decodeIpf2])[sys.peek(infilePtr + 13)]
+    let flags = sys.peek(infilePtr+12)
+    let ipfType = sys.peek(infilePtr+13)
+    let isProgressive = (flags & 0x80) != 0
+    let hasAlpha = (flags & 0x01) != 0
+
+    // Select decode function based on type and progressive flag
+    let decodefun
+    if (isProgressive) {
+        decodefun = ([graphics.decodeIpf1Progressive, graphics.decodeIpf2Progressive])[ipfType]
+    } else {
+        decodefun = ([graphics.decodeIpf1, graphics.decodeIpf2])[ipfType]
+    }
+
     let width = sys.peek(infilePtr+8) | (sys.peek(infilePtr+9) << 8)
     let height = sys.peek(infilePtr+10) | (sys.peek(infilePtr+11) << 8)
-    let hasAlpha = (sys.peek(infilePtr+12) != 0)
-    let ipfType = sys.peek(infilePtr+13)
     let imgLen = sys.peek(infilePtr+24) | (sys.peek(infilePtr+25) << 8) | (sys.peek(infilePtr+26) << 16) | (sys.peek(infilePtr+27) << 24)
 
     let ipfbuf = sys.malloc(imgLen)
@@ -924,8 +941,9 @@ _TVDOS.DRV.FS.DEVTMP.bread = (fd) => {
 _TVDOS.DRV.FS.DEVTMP.pread = (fd, ptr, count, offset) => {
     if (_TVDOS.TMPFS[fd.path] === undefined) throw Error(`No such file: ${fd.fullPath}`)
     let str = _TVDOS.TMPFS[fd.path].dataAsString()
-    for (let i = 0; i < count - (offset || 0); i++) {
+    let off = offset || 0
-        sys.poke(ptr + i, String.charCodeAt(i + (offset || 0)))
+    for (let i = 0; i < count; i++) {
+        sys.poke(ptr + i, str.charCodeAt(off + i))
     }
 }
 
@@ -973,6 +991,7 @@ _TVDOS.DRV.FS.DEVTMP.remove = (fd) => {
     return true
 }
 _TVDOS.DRV.FS.DEVTMP.exists = (fd) => (_TVDOS.TMPFS[fd.path] !== undefined)
+_TVDOS.DRV.FS.DEVTMP.getFileLen = (fd) => (_TVDOS.TMPFS[fd.path].length)
 
 Object.freeze(_TVDOS.DRV.FS.DEVTMP)
 
@@ -1014,136 +1033,6 @@ _TVDOS.DRV.FS.NET.exists = (fd) => {
     return (0 == com.getStatusCode(port[0]))
 }
 
-///////////////////////////////////////////////////////////////////////////////
-
-
-// Legacy Serial filesystem, !!pending for removal!!
-
-
-/*const filesystem = {};
-
-filesystem._toPorts = (driveLetter) => {
-    if (driveLetter.toUpperCase === undefined) {
-        throw Error("'"+driveLetter+"' (type: "+typeof driveLetter+") is not a valid drive letter");
-    }
-    var port = _TVDOS.DRIVES[driveLetter.toUpperCase()];
-    if (port === undefined) {
-        throw Error("Drive letter '" + driveLetter.toUpperCase() + "' does not exist");
-    }
-    return port
-};
-filesystem._close = (portNo) => {
-    com.sendMessage(portNo, "CLOSE")
-}
-filesystem._flush = (portNo) => {
-    com.sendMessage(portNo, "FLUSH")
-}
-
-// @return disk status code (0 for successful operation)
-//         throws if:
-//             - java.lang.NullPointerException if path is null
-//             - Error if operation mode is not "R", "W" nor "A"
-filesystem.open = (driveLetter, path, operationMode) => {
-    var port = filesystem._toPorts(driveLetter);
-
-    filesystem._flush(port[0]); filesystem._close(port[0]);
-
-    var mode = operationMode.toUpperCase();
-    if (mode != "R" && mode != "W" && mode != "A") {
-        throw Error("Unknown file opening mode: " + mode);
-    }
-
-    com.sendMessage(port[0], "OPEN"+mode+'"'+path+'",'+port[1]);
-    return com.getStatusCode(port[0]);
-};
-filesystem.getFileLen = (driveLetter) => {
-    var port = filesystem._toPorts(driveLetter);
-    com.sendMessage(port[0], "GETLEN");
-    var response = com.getStatusCode(port[0]);
-    if (135 == response) {
-        throw Error("File not opened");
-    }
-    if (response < 0 || response >= 128) {
-        throw Error("Reading a file failed with "+response);
-    }
-    return Number(com.pullMessage(port[0]));
-};
-// @return the entire contents of the file in String
-filesystem.readAll = (driveLetter) => {
-    var port = filesystem._toPorts(driveLetter);
-    com.sendMessage(port[0], "READ");
-    var response = com.getStatusCode(port[0]);
-    if (135 == response) {
-        throw Error("File not opened");
-    }
-    if (response < 0 || response >= 128) {
-        throw Error("Reading a file failed with "+response);
-    }
-    return com.pullMessage(port[0]);
-};
-filesystem.readAllBytes = (driveLetter) => {
-    var str = filesystem.readAll(driveLetter);
-    var bytes = new Uint8Array(str.length);
-    for (let i = 0; i < str.length; i++) {
-        bytes[i] = str.charCodeAt(i);
-    }
-    return bytes;
-};
-filesystem.write = (driveLetter, string) => {
-    var port = filesystem._toPorts(driveLetter);
-    com.sendMessage(port[0], "WRITE"+string.length);
-    var response = com.getStatusCode(port[0]);
-    if (135 == response) {
-        throw Error("File not opened");
-    }
-    if (response < 0 || response >= 128) {
-        throw Error("Writing a file failed with "+response);
-    }
-    com.sendMessage(port[0], string);
-    filesystem._flush(port[0]); filesystem._close(port[0]);
-};
-filesystem.writeBytes = (driveLetter, bytes) => {
-    var string = btostr(bytes); // no spreading: has length limit
-    filesystem.write(driveLetter, string);
-};
-filesystem.isDirectory = (driveLetter) => {
-    var port = filesystem._toPorts(driveLetter);
-    com.sendMessage(port[0], "LISTFILES");
-    var response = com.getStatusCode(port[0]);
-    return (response === 0);
-};
-filesystem.mkDir = (driveLetter) => {
-    var port = filesystem._toPorts(driveLetter);
-    com.sendMessage(port[0], "MKDIR");
-    var response = com.getStatusCode(port[0]);
-
-    if (response < 0 || response >= 128) {
-        var status = com.getDeviceStatus(port[0]);
-        throw Error("Creating a directory failed with ("+response+"): "+status.message+"\n");
-    }
-    return (response === 0); // possible status codes: 0 (success), 1 (fail)
-};
-filesystem.touch = (driveLetter) => {
-    var port = filesystem._toPorts(driveLetter);
-    com.sendMessage(port[0], "TOUCH");
-    var response = com.getStatusCode(port[0]);
-    return (response === 0);
-};
-filesystem.mkFile = (driveLetter) => {
-    var port = filesystem._toPorts(driveLetter);
-    com.sendMessage(port[0], "MKFILE");
-    var response = com.getStatusCode(port[0]);
-    return (response === 0);
-};
-filesystem.remove = (driveLetter) => {
-    var port = filesystem._toPorts(driveLetter);
-    com.sendMessage(port[0], "DELETE");
-    var response = com.getStatusCode(port[0]);
-    return (response === 0);
-};
-Object.freeze(filesystem);*/
-
-
 ///////////////////////////////////////////////////////////////////////////////
 
 const files = {}
@@ -1522,9 +1411,6 @@ let requireFromMemory = (ptr) => {
 }*/
 
 
-var GL = require("A:/tvdos/include/gl.mjs")
-
-
 // @param cmdsrc JS source code
 // @param args arguments for the program, must be Array, and args[0] is always the name of the program, e.g.
 //        for command line 'echo foo bar', args[0] must be 'echo'
@@ -1537,7 +1423,7 @@ var execApp = (cmdsrc, args, appname) => {
 `var ${appname}=function(exec_args){${injectIntChk(cmdsrc, intchkFunName)}\n};` +
 `${appname}`); // making 'exec_args' a app-level global
 
-        execAppPrg(args);
+        return execAppPrg(args);
 }
 
 

assets/disk0/tvdos/bin/command.js

@@ -35,7 +35,7 @@ function print_prompt_text() {
         print(" "+CURRENT_DRIVE+":")
         con.color_pair(161,253)
         con.addch(16);con.curs_right()
-        con.color_pair(0,253)
+        con.color_pair(240,253)
         print(" \\"+shell_pwd.join("\\").substring(1)+" ")
         if (errorlevel != 0 && errorlevel != "undefined" && errorlevel != undefined) {
             con.color_pair(166,253)
@@ -61,7 +61,7 @@ function greet() {
         con.clear()
         con.color_pair(253,255)
         print('  ');con.addch(17);con.curs_right()
-        con.color_pair(0,253)
+        con.color_pair(240,253)
         print(" ".repeat(greetLeftPad)+welcome_text+" ".repeat(greetRightPad))
         con.color_pair(253,255)
         con.addch(16);con.curs_right();print('  ')
@@ -77,56 +77,31 @@ function printmotd() {
     let motd = motdFile.sread().trim()
     let width = con.getmaxyx()[1]
 
+    let ts = require("typesetter")
 
     if (goFancy) {
         let margin = 4
         let internalWidth = width - 2*margin
+        let textWidth = internalWidth - 2  // one space of padding inside each ribbon edge
 
-        con.color_pair(255,253) // white text, transparent back (initial ribbon)
+        let lines = ts.typeset(motd, textWidth)
-
+        lines.forEach(line => {
-        let [cy, cx] = con.getyx()
+            let [cy, _cx] = con.getyx()
-
+            con.color_pair(255,253) // ribbon edge: white text, transparent back
-        con.mvaddch(cy, 4, 16);con.curs_right();print(' ')
+            con.mvaddch(cy, margin, 16); con.curs_right()
-
+            print(' ')
-        const PCX_INIT = margin - 2
+            con.color_pair(240,253) // body: black text, white back
-        let tcnt = 0
+            print(line)
-        let pcx = PCX_INIT
+            con.color_pair(255,253)
-        con.color_pair(240,253) // black text, white back (first line of text)
+            print(' ')
-        while (tcnt <= motd.length) {
+            con.addch(17); println()
-            let char = motd.charAt(tcnt)
+        })
-
-            if (char != '\n') {
-                // prevent the line starting from ' '
-                if (pcx != PCX_INIT || char != ' ') {
-                    print(motd.charAt(tcnt))
-                }
-                pcx += 1
-            }
-
-            if ('\n' == char || pcx % internalWidth == 0 && pcx != 0 || tcnt == motd.length) {
-                // current line ending
-                let [_, ncx] = con.getyx()
-                for (let k = 0; k < width - margin - ncx + 1; k++) print(' ')
-                con.color_pair(255,253) // white text, transparent back
-                con.addch(17);println()
-
-                if (tcnt == motd.length) break
-
-                // next line header
-                let [ncy, __] = con.getyx()
-                con.color_pair(255,253) // white text, transparent back
-                con.mvaddch(ncy, 4, 16);con.curs_right();print(' ');con.color_pair(240,253) // black text, white back (subsequent lines of the text)
-                pcx = PCX_INIT
-            }
-
-            tcnt += 1
-        }
-
         con.reset_graphics()
     }
     else {
         println()
-        println(motd)
+        let lines = ts.typeset(motd, width)
+        lines.forEach(line => println(line))
     }
 
     println()
@@ -577,6 +552,59 @@ shell.coreutils = {
     ver: function(args) {
         println(welcome_text)
     },
+    which: function(args) {
+        if (args[1] === undefined) {
+            printerrln(`Usage: ${args[0].toUpperCase()} program_name`)
+            return 1
+        }
+        let cmd = args[1]
+
+        if (shell.coreutils[cmd.toLowerCase()] !== undefined) {
+            println(`${cmd}: shell built-in command`)
+            return 0
+        }
+
+        var fileExists = false
+        var searchFile
+        var searchPath = ""
+
+        if (shell.isValidDriveLetter(cmd[0]) && cmd[1] == ':') {
+            searchFile = files.open(cmd)
+            searchPath = trimStartRevSlash(searchFile.path)
+            fileExists = searchFile.exists
+        }
+        else {
+            var searchDir = (cmd.startsWith("/")) ? [""] : ["/"+shell_pwd.join("/")].concat(_TVDOS.getPath())
+
+            var pathExt = []
+            if (cmd.split(".")[1] === undefined)
+                _TVDOS.variables.PATHEXT.split(';').forEach(function(it) { pathExt.push(it); pathExt.push(it.toUpperCase()); })
+            else
+                pathExt.push("")
+
+            searchLoop:
+            for (var i = 0; i < searchDir.length; i++) {
+                for (var j = 0; j < pathExt.length; j++) {
+                    let search = searchDir[i]; if (!search.endsWith('\\')) search += '\\'
+                    searchPath = trimStartRevSlash(search + cmd + pathExt[j])
+
+                    searchFile = files.open(`${CURRENT_DRIVE}:\\${searchPath}`)
+                    if (searchFile.exists) {
+                        fileExists = true
+                        break searchLoop
+                    }
+                }
+            }
+        }
+
+        if (!fileExists) {
+            printerrln(`${cmd}: not found`)
+            return 1
+        }
+
+        println(searchFile.fullPath)
+        return 0
+    },
     panic: function(args) {
         throw Error("Panicking command.js")
     }
@@ -590,6 +618,7 @@ shell.coreutils.ls = shell.coreutils.dir
 shell.coreutils.time = shell.coreutils.date
 shell.coreutils.md = shell.coreutils.mkdir
 shell.coreutils.move = shell.coreutils.mv
+shell.coreutils.where = shell.coreutils.which
 // end of command aliases
 Object.freeze(shell.coreutils)
 shell.stdio = {
@@ -614,13 +643,25 @@ require = function(path) {
     if (path[1] == ":") return shell.require(path)
     else {
         // if the path starts with ".", look for the current directory
-        // if the path starts with [A-Za-z0-9], look for the DOSDIR/includes
+        // if the path starts with [A-Za-z0-9], search through INCLPATH
         if (path[0] == '.') return shell.require(shell.resolvePathInput(path).full + ".mjs")
-        else return shell.require(`A:${_TVDOS.variables.DOSDIR}/include/${path}.mjs`)
+        else {
+            let inclDirs = (_TVDOS.variables.INCLPATH || "").split(';').filter(function(it) { return it.length > 0 })
+            for (let i = 0; i < inclDirs.length; i++) {
+                let dir = inclDirs[i]
+                if (!dir.endsWith('\\') && !dir.endsWith('/')) dir += '\\'
+                let candidate = `${CURRENT_DRIVE}:${dir}${path}.mjs`
+                if (files.open(candidate).exists) return shell.require(candidate)
+            }
+            // no match found; defer to shell.require with the first entry so the error mentions a sensible path
+            let firstDir = inclDirs[0] || `${_TVDOS.variables.DOSDIR}\\include`
+            if (!firstDir.endsWith('\\') && !firstDir.endsWith('/')) firstDir += '\\'
+            return shell.require(`${CURRENT_DRIVE}:${firstDir}${path}.mjs`)
+        }
     }
 }
 
-shell.execute = function(line) {
+shell.execute = function(line, nameOverride) {
     if (0 == line.size) return
     let parsedTokens = shell.parse(line) // echo, "hai", |, less
     let statements = [] // [[echo, "hai"], [less]]
@@ -753,6 +794,34 @@ shell.execute = function(line) {
                         shell.execute(line)
                     })
                 }
+                else if ("ALIAS" == extension) {
+                    // parse alias
+                    // $0: all arguments
+                    // $1..9: specific arguments
+                    // Tokens that contain whitespace or shell metacharacters must be re-quoted
+                    // before re-execution, otherwise the re-parse splits them on spaces.
+                    var quoteAliasArg = function(s) {
+                        if (s === undefined || s === null) return ""
+                        s = ''+s
+                        if (s.length === 0) return ""
+                        if (/[\s"|><&]/.test(s)) return '"' + s.replaceAll('"', '^"') + '"'
+                        return s
+                    }
+                    var lines = programCode.split('\n').filter(function(it) { return it.length > 0 }) // this return is not shell's return!
+                    lines.forEach(function(line) {
+                        var newLine = line
+
+                        // replace $1..$9
+                        for (let j = 1; j <= 9; j++) {
+                            newLine = newLine.replaceAll('$'+j, quoteAliasArg(tokens[j]))
+                        }
+
+                        // replace $0
+                        newLine = newLine.replaceAll('$0', tokens.slice(1).map(quoteAliasArg).join(' '))
+
+                        shell.execute(newLine, cmd)
+                    })
+                }
                 else if ("APP" == extension) {
                     let appexec = `A:${_TVDOS.variables.DOSDIR}\\sbin\\appexec.js`
                     let foundFile = searchFile.fullPath
@@ -767,6 +836,10 @@ shell.execute = function(line) {
                         errorlevel = 0 // reset the number
 
                         if (_G.shellProgramTitles === undefined) _G.shellProgramTitles = []
+                        if (nameOverride !== undefined) {
+                            tokens[0] = (''+nameOverride)
+                            cmd = tokens[0]
+                        }
                         _G.shellProgramTitles.push(cmd.toUpperCase())
                         sendLcdMsg(_G.shellProgramTitles[_G.shellProgramTitles.length - 1])
                         //serial.println(_G.shellProgramTitles)
@@ -866,6 +939,18 @@ _G.shell = shell
 
 ///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 
+// ensure USERCONFIGPATH directory exists
+try {
+    let userConfigPath = `${CURRENT_DRIVE}:${_TVDOS.variables.USERCONFIGPATH}`
+    let userConfigDir = files.open(userConfigPath)
+    if (!userConfigDir.exists) {
+        debugprintln(`command.js > creating USERCONFIGPATH at ${userConfigPath}`)
+        userConfigDir.mkDir()
+    }
+} catch (e) {
+    debugprintln("command.js > USERCONFIGPATH creation failed: " + e.message)
+}
+
 if (exec_args[1] !== undefined) {
     // only meaningful switches would be either -c or -k anyway
     var firstSwitch = exec_args[1].toLowerCase()

assets/disk0/tvdos/bin/hopper.js

@@ -0,0 +1,956 @@
+/**
+ * Hopper is a package manager for TVDOS
+ * Created by CuriousTorvald on 2026-04-16
+ */
+
+const SYSTEM_PACKEAGE_DEF_DIR  = "A:/tvdos/hopper"
+const USER_BASE_DIR            = "A:/hopper"
+const USER_PACKAGE_DEF_DIR     = `${USER_BASE_DIR}/manifests`
+const USER_PACKAGE_BIN_DIR     = `${USER_BASE_DIR}/bin`
+const USER_PACKAGE_INCLUDE_DIR = `${USER_BASE_DIR}/include`
+const MANIFEST_EXT = "hop.per"
+const MIRROR_LIST_PATH = `${SYSTEM_PACKEAGE_DEF_DIR}/mirrors.list`
+
+const net = require("A:/tvdos/include/net.mjs")
+
+// SYNOPSIS
+// hopper {search,se} [--provides, --requires, --description, --author] query
+//// default searches from ProperName
+// hopper {install,in} query [-v version]
+// hopper {remove,rm} query
+
+// ============================================================
+// Manifest parsing
+// ============================================================
+
+function splitList(s) {
+    if (!s) return []
+    return s.split(";").map(it => it.trim()).filter(it => it.length > 0)
+}
+
+function parseManifest(text) {
+    const m = {}
+    text.split("\n").forEach(rawLine => {
+        const line = rawLine.replace(/\r$/, "")
+        if (line.length === 0) return
+        const idx = line.indexOf(":")
+        if (idx < 0) return
+        const key = line.substring(0, idx).trim()
+        const value = line.substring(idx + 1).trim()
+        m[key] = value
+    })
+    return m
+}
+
+function readManifestFile(path) {
+    const f = files.open(path)
+    if (!f.exists || f.isDirectory) return undefined
+    const m = parseManifest(f.sread())
+    m._manifestPath = path
+    return m
+}
+
+function _listManifestsFrom(dirPath, origin) {
+    const dir = files.open(dirPath)
+    if (!dir.exists || !dir.isDirectory) return []
+    const out = []
+    dir.list().forEach(entry => {
+        if (entry.isDirectory) return
+        if (!entry.name.toLowerCase().endsWith(MANIFEST_EXT)) return
+        const m = readManifestFile(entry.fullPath)
+        if (m !== undefined) {
+            m._origin = origin
+            out.push(m)
+        }
+    })
+    return out
+}
+
+// System packages (shipped with TVDOS) live in SYSTEM_PACKAGE_DEF_DIR
+// and are read-only as far as hopper is concerned. User packages,
+// installed by `hopper install`, live under USER_PACKAGE_DEF_DIR. The
+// resolver treats both as "installed", but the install/remove paths
+// refuse to modify anything tagged `_origin === "system"`.
+function listInstalledManifests() {
+    return _listManifestsFrom(SYSTEM_PACKEAGE_DEF_DIR, "system")
+        .concat(_listManifestsFrom(USER_PACKAGE_DEF_DIR, "user"))
+}
+
+function findInstalledManifest(name) {
+    // Prefer user-installed copy when a system package with the same name
+    // also exists -- but that combination is normally refused at install.
+    const userDirect = `${USER_PACKAGE_DEF_DIR}/${name}.${MANIFEST_EXT}`
+    let m = readManifestFile(userDirect)
+    if (m !== undefined) { m._origin = "user"; return m }
+
+    const sysDirect = `${SYSTEM_PACKEAGE_DEF_DIR}/${name}.${MANIFEST_EXT}`
+    m = readManifestFile(sysDirect)
+    if (m !== undefined) { m._origin = "system"; return m }
+
+    const all = listInstalledManifests()
+    for (let i = 0; i < all.length; i++) {
+        if ((all[i].HopperPackageName || "") === name) return all[i]
+    }
+    return undefined
+}
+
+// Yes/no prompt. Empty input falls back to `defaultYes`.
+function confirm(prompt, defaultYes) {
+    const hint = defaultYes ? "[Y/n]" : "[y/N]"
+    print(`${prompt} ${hint} `)
+    const ans = (read() || "").trim().toLowerCase()
+    if (ans === "") return !!defaultYes
+    return ans === "y" || ans === "yes"
+}
+
+// ============================================================
+// Install layout helpers
+// ============================================================
+//
+// User-installed packages live under `A:/hopper/`. Files are routed
+// by extension: `.mjs` includes go under `include/`, everything else
+// (`.js`, `.alias`, `.lfs`, data blobs, ...) lands in `bin/`. The
+// downloaded manifest is saved under `manifests/` with a
+// `SystemPackagePath` field appended that lists the resulting paths.
+
+// Strip query/fragment and take the last `/`-separated component of `url`.
+function urlBasename(url) {
+    let s = String(url || "")
+    const qm = s.indexOf("?");   if (qm   >= 0) s = s.substring(0, qm)
+    const hash = s.indexOf("#"); if (hash >= 0) s = s.substring(0, hash)
+    const slash = s.lastIndexOf("/")
+    return (slash < 0) ? s : s.substring(slash + 1)
+}
+
+function routeForBasename(name) {
+    return (String(name || "").toLowerCase().endsWith(".mjs"))
+        ? USER_PACKAGE_INCLUDE_DIR
+        : USER_PACKAGE_BIN_DIR
+}
+
+// Convert a USER_BASE_DIR-relative absolute path ("A:/hopper/bin/foo.js")
+// into its declarable form ("/hopper/bin/foo.js"), matching the
+// `SystemPackagePath` convention used by the system manifests.
+function declarablePath(absPath) {
+    let p = String(absPath || "").replace(/\\/g, "/")
+    if (/^[A-Za-z]:/.test(p)) p = p.substring(2)
+    return p
+}
+
+// Parse PackageFileList (semicolon-separated full URLs) into a list of
+// download descriptors: { url, basename, localPath }.
+function parsePackageFileList(s) {
+    const out = []
+    splitList(s || "").forEach(url => {
+        const base = urlBasename(url)
+        if (base.length === 0) return
+        const dir  = routeForBasename(base)
+        out.push({ url: url, basename: base, localPath: `${dir}/${base}` })
+    })
+    return out
+}
+
+function ensureUserDirs() {
+    [USER_BASE_DIR, USER_PACKAGE_BIN_DIR, USER_PACKAGE_INCLUDE_DIR, USER_PACKAGE_DEF_DIR].forEach(p => {
+        const d = files.open(p)
+        if (!d.exists) d.mkDir()
+    })
+}
+
+// Re-emit a parsed manifest, preserving insertion order, dropping
+// internal `_*` keys, and replacing any pre-existing SystemPackagePath
+// with the locally-computed one so the field always reflects what is
+// actually on disk.
+function serializeManifest(manifestObj, installedPathStr) {
+    const lines = []
+    Object.keys(manifestObj).forEach(k => {
+        if (k.length > 0 && k[0] === "_") return
+        if (k === "SystemPackagePath") return
+        lines.push(`${k}:${manifestObj[k]}`)
+    })
+    lines.push(`SystemPackagePath:${installedPathStr}`)
+    return lines.join("\n") + "\n"
+}
+
+// Delete every file declared in `manifest.SystemPackagePath` plus the
+// manifest file itself. Wildcards are expanded via `expandSystemPath`.
+function deleteInstalledFiles(manifest) {
+    const removed = []
+    splitList(manifest.SystemPackagePath || "").forEach(p => {
+        expandSystemPath(p).forEach(abs => {
+            const fd = files.open(abs)
+            if (!fd.exists) return
+            try { fd.remove(); removed.push(abs) }
+            catch (e) { printerrln(`  ! failed to remove ${abs}: ${e}`) }
+        })
+    })
+    if (manifest._manifestPath) {
+        const mfd = files.open(manifest._manifestPath)
+        if (mfd.exists) {
+            try { mfd.remove(); removed.push(manifest._manifestPath) }
+            catch (e) { printerrln(`  ! failed to remove ${manifest._manifestPath}: ${e}`) }
+        }
+    }
+    return removed
+}
+
+// ============================================================
+// SemVer (strict X.Y.Z) and constraint matching
+// ============================================================
+//
+// Versions are strict Semantic Versioning: three non-negative integer
+// components MAJOR.MINOR.PATCH. No pre-release / build metadata.
+//
+// Constraint grammar (intentionally small, expandable later):
+//   *           any version
+//   X.*         major X, any minor/patch
+//   X.Y.*       major X, minor Y, any patch
+//   X.Y.Z       exact
+//   ^X.Y.Z      >= X.Y.Z and < (X+1).0.0  (major-compatible)
+//   ~X.Y.Z      >= X.Y.Z and < X.(Y+1).0  (minor-compatible)
+//   >=X.Y.Z / >X.Y.Z / <=X.Y.Z / <X.Y.Z / =X.Y.Z
+//
+// Multiple comma-separated constraints are AND-ed: "^1.2.0,<1.5.0".
+
+function parseVersion(v) {
+    const m = String(v || "0.0.0").trim().match(/^(\d+)\.(\d+)\.(\d+)$/)
+    if (!m) return [0, 0, 0]
+    return [parseInt(m[1], 10), parseInt(m[2], 10), parseInt(m[3], 10)]
+}
+
+function compareVersion(a, b) {
+    const A = parseVersion(a), B = parseVersion(b)
+    for (let i = 0; i < 3; i++) {
+        if (A[i] !== B[i]) return (A[i] < B[i]) ? -1 : 1
+    }
+    return 0
+}
+
+function _matchSingleConstraint(version, c) {
+    c = c.trim()
+    if (c === "" || c === "*") return true
+
+    // Operator form: ^, ~, >=, <=, >, <, =
+    let opMatch = c.match(/^(\^|~|>=|<=|>|<|=)\s*(\d+\.\d+\.\d+)$/)
+    if (opMatch) {
+        const op = opMatch[1]
+        const target = opMatch[2]
+        const cmp = compareVersion(version, target)
+        const [tM, tm] = parseVersion(target)
+        switch (op) {
+            case "=":  return cmp === 0
+            case ">":  return cmp >  0
+            case ">=": return cmp >= 0
+            case "<":  return cmp <  0
+            case "<=": return cmp <= 0
+            case "^":  return cmp >= 0 && compareVersion(version, `${tM + 1}.0.0`) < 0
+            case "~":  return cmp >= 0 && compareVersion(version, `${tM}.${tm + 1}.0`) < 0
+        }
+    }
+
+    // Wildcard form: X.*, X.Y.*, X.x, X.Y.x, or exact X.Y.Z
+    const parts = c.split(".")
+    const vparts = parseVersion(version)
+    for (let i = 0; i < parts.length && i < 3; i++) {
+        if (parts[i] === "*" || parts[i] === "x" || parts[i] === "X") return true
+        const expected = parseInt(parts[i], 10)
+        if (isNaN(expected) || vparts[i] !== expected) return false
+    }
+    // All listed parts matched literally; remaining parts (if any) must be 0
+    for (let i = parts.length; i < 3; i++) {
+        if (vparts[i] !== 0) return false
+    }
+    return true
+}
+
+function satisfies(version, constraint) {
+    if (!constraint) return true
+    return constraint.split(",").every(c => _matchSingleConstraint(version, c))
+}
+
+function parseRequires(s) {
+    const out = []
+    splitList(s || "").forEach(entry => {
+        // "<name>" or "<name> <constraint>"
+        const idx = entry.search(/\s+/)
+        if (idx < 0) {
+            out.push({ name: entry, constraint: "*" })
+        } else {
+            out.push({ name: entry.substring(0, idx), constraint: entry.substring(idx + 1).trim() })
+        }
+    })
+    return out
+}
+
+// HopperProvides entries are "<name>" or "<name> <version>". A bare name
+// falls back to the package's own HopperPackageVersion — the same idea
+// as RPM's `Provides: aalib = 1.2.0` (where the package's real name and
+// version may differ from the virtual identity it exposes).
+function parseProvides(s, fallbackVersion) {
+    const out = []
+    splitList(s || "").forEach(entry => {
+        const idx = entry.search(/\s+/)
+        if (idx < 0) {
+            out.push({ name: entry, version: fallbackVersion })
+        } else {
+            const v = entry.substring(idx + 1).trim()
+            out.push({ name: entry.substring(0, idx), version: v || fallbackVersion })
+        }
+    })
+    return out
+}
+
+// Look up the version a candidate exposes for `name`. If `name` matches
+// the package's own name (or isn't declared in HopperProvides at all),
+// returns the package's own version.
+function providedVersionOf(candidate, name) {
+    if (candidate.provides) {
+        for (let i = 0; i < candidate.provides.length; i++) {
+            if (candidate.provides[i].name === name) return candidate.provides[i].version
+        }
+    }
+    return candidate.version
+}
+
+// ============================================================
+// Candidate index (installed + upstream)
+// ============================================================
+
+function _manifestToCandidate(m, source) {
+    const name    = m.HopperPackageName || ""
+    const version = m.HopperPackageVersion || "0.0.0"
+    const provides = parseProvides(m.HopperProvides || "", version)
+    // Every package implicitly provides itself at its own version. Only
+    // synthesise this when the manifest didn't declare it explicitly.
+    if (name && !provides.some(p => p.name === name)) {
+        provides.unshift({ name: name, version: version })
+    }
+    return {
+        name:     name,
+        version:  version,
+        requires: parseRequires(m.HopperRequires || ""),
+        provides: provides,
+        source:   source, // "installed" | "upstream"
+        manifest: m
+    }
+}
+
+// Returns map: packageName -> array<Candidate>
+function buildCandidateIndex() {
+    const idx = new Map()
+    function add(c) {
+        if (!idx.has(c.name)) idx.set(c.name, [])
+        // De-dupe (name+version+source)
+        const arr = idx.get(c.name)
+        if (arr.some(x => x.version === c.version && x.source === c.source)) return
+        arr.push(c)
+    }
+
+    listInstalledManifests().forEach(m => add(_manifestToCandidate(m, "installed")))
+    fetchRemoteCandidates().forEach(m => add(_manifestToCandidate(m, "upstream")))
+
+    return idx
+}
+
+// Anything that satisfies a requirement on `name`: a package whose own
+// HopperPackageName matches OR whose HopperProvides declares `name`.
+// Each candidate now carries `provides` as {name, version} pairs; the
+// package's own (name, version) is always present (see
+// _manifestToCandidate), so a single pass over `provides` is enough.
+function findProviders(idx, name) {
+    const out = []
+    const seen = new Set()
+    idx.forEach(candidates => {
+        candidates.forEach(c => {
+            if (seen.has(c)) return
+            if (c.provides.some(p => p.name === name)) {
+                out.push(c)
+                seen.add(c)
+            }
+        })
+    })
+    return out
+}
+
+// Sort: installed first (no churn), then highest version, then upstream order.
+function sortCandidates(cands) {
+    return cands.slice().sort((a, b) => {
+        if (a.source !== b.source) return (a.source === "installed") ? -1 : 1
+        return -compareVersion(a.version, b.version)
+    })
+}
+
+// ============================================================
+// Resolver (snapshot-based backtracking; precursor to a SAT solver)
+// ============================================================
+//
+// State: chosen :: Map<packageName, Candidate>
+// At every choice point we snapshot the whole map so that backtracking
+// also undoes any transitive picks. The candidate ordering encodes the
+// preference policy:
+//
+//   1. Keep installed if it satisfies the constraint.
+//   2. Otherwise pick the newest upstream version that satisfies.
+//   3. If newer versions cause downstream conflicts, walk older versions
+//      (downgrade) until either something fits or candidates are exhausted.
+//
+// The structure is intentionally close to DPLL: each "decision" is the
+// candidate we assign to a variable, and "unit propagation" is the
+// recursive resolve() call over each requirement. Replacing this with
+// clause learning / a watched-literals scheme later would be local.
+
+function resolveAll(idx, requirements) {
+    const chosen = new Map()
+    const issues = []
+
+    function snapshot()           { return new Map(chosen) }
+    function restore(snap)        { chosen.clear(); snap.forEach((v, k) => chosen.set(k, v)) }
+
+    function _resolve(reqName, constraint, trail) {
+        const existing = chosen.get(reqName)
+        if (existing !== undefined) {
+            const v = providedVersionOf(existing, reqName)
+            return satisfies(v, constraint)
+                ? { ok: true }
+                : { ok: false, reason: `${reqName} pinned to ${v}, but ${trail.join(" -> ")} requires ${constraint}` }
+        }
+
+        const providers = findProviders(idx, reqName)
+        if (providers.length === 0) {
+            return { ok: false, reason: `no package provides "${reqName}" (required by ${trail.join(" -> ") || "<root>"})` }
+        }
+        // Satisfaction checks the virtual version the candidate exposes
+        // for `reqName` (HopperProvides), not necessarily the package's
+        // own HopperPackageVersion.
+        const matching = sortCandidates(providers.filter(c => satisfies(providedVersionOf(c, reqName), constraint)))
+        if (matching.length === 0) {
+            const versions = providers.map(p => `${providedVersionOf(p, reqName)}[${p.source}]`).join(", ")
+            return { ok: false, reason: `no version of "${reqName}" satisfies ${constraint} (available: ${versions})` }
+        }
+
+        let lastReason = null
+        for (let i = 0; i < matching.length; i++) {
+            const cand = matching[i]
+            const snap = snapshot()
+            chosen.set(cand.name, cand)
+
+            let allOk = true
+            const subTrail = trail.concat([`${cand.name}@${cand.version}`])
+            for (let j = 0; j < cand.requires.length; j++) {
+                const req = cand.requires[j]
+                const r = _resolve(req.name, req.constraint, subTrail)
+                if (!r.ok) {
+                    allOk = false
+                    lastReason = r.reason
+                    break
+                }
+            }
+            if (allOk) return { ok: true }
+            restore(snap)
+        }
+
+        return { ok: false, reason: lastReason || `no working candidate for "${reqName}"` }
+    }
+
+    requirements.forEach(req => {
+        const r = _resolve(req.name, req.constraint, [])
+        if (!r.ok) issues.push(r.reason)
+    })
+
+    return { chosen, issues }
+}
+
+// Compare resolved assignment against currently-installed state.
+function classifyPlan(idx, chosen) {
+    const installedByName = new Map()
+    listInstalledManifests().forEach(m => installedByName.set(m.HopperPackageName, m))
+
+    const actions = []
+    chosen.forEach((cand, name) => {
+        const inst = installedByName.get(name)
+        if (cand.source === "installed") {
+            actions.push({ action: "keep", name, version: cand.version })
+        }
+        else if (inst === undefined) {
+            actions.push({ action: "install", name, version: cand.version })
+        }
+        else {
+            const cmp = compareVersion(cand.version, inst.HopperPackageVersion)
+            if      (cmp > 0) actions.push({ action: "upgrade",   name, from: inst.HopperPackageVersion, to: cand.version })
+            else if (cmp < 0) actions.push({ action: "downgrade", name, from: inst.HopperPackageVersion, to: cand.version })
+            else              actions.push({ action: "reinstall", name, version: cand.version })
+        }
+    })
+    return actions
+}
+
+function printPlan(actions, target) {
+    const changing = actions.filter(a => a.action !== "keep")
+    if (changing.length === 0) {
+        println(`Nothing to do: ${target} is already installed and satisfied.`)
+        return
+    }
+    println("Plan:")
+    changing.forEach(a => {
+        switch (a.action) {
+            case "install":   println(`  + install    ${a.name} ${a.version}`); break
+            case "upgrade":   println(`  ^ upgrade    ${a.name} ${a.from} -> ${a.to}`); break
+            case "downgrade": println(`  v downgrade  ${a.name} ${a.from} -> ${a.to}`); break
+            case "reinstall": println(`  = reinstall  ${a.name} ${a.version}`); break
+        }
+    })
+}
+
+// ============================================================
+// Remote mirrors
+// ============================================================
+//
+// `mirrors.list` lives next to the installed package manifests.
+// Each non-empty, non-`#` line is the URL prefix of a Hopper mirror.
+// The mirror MUST expose `<prefix>mirror_manifest` (key:value pairs
+// describing the mirror) and `<prefix>filelist` (CSV with rows of
+// `packagename,version,hoppermanifest-filename`).
+//
+// Trailing slash on the prefix is optional and will be added if missing.
+
+function loadMirrorList() {
+    const f = files.open(MIRROR_LIST_PATH)
+    if (!f.exists || f.isDirectory) return []
+    return f.sread().split("\n")
+        .map(line => line.replace(/\r$/, "").trim())
+        .filter(line => line.length > 0 && line[0] !== "#")
+        .map(line => line.endsWith("/") ? line : (line + "/"))
+}
+
+function parseFileList(text) {
+    const out = []
+    text.split("\n").forEach(raw => {
+        const line = raw.replace(/\r$/, "").trim()
+        if (line.length === 0 || line[0] === "#") return
+        const parts = line.split(",")
+        if (parts.length < 3) return
+        out.push({
+            name:    parts[0].trim(),
+            version: parts[1].trim(),
+            file:    parts[2].trim(),
+        })
+    })
+    return out
+}
+
+function fetchManifestsFromMirror(prefix) {
+    const mfText = net.fetchText(prefix + "mirror_manifest")
+    if (mfText === null) {
+        printerrln(`  ! could not reach mirror: ${prefix}`)
+        return []
+    }
+    const mirror = parseManifest(mfText)
+    const mirrorName = mirror.HopperMirrorName || prefix
+
+    const flText = net.fetchText(prefix + "filelist")
+    if (flText === null) {
+        printerrln(`  ! mirror "${mirrorName}" has no filelist`)
+        return []
+    }
+
+    const out = []
+    parseFileList(flText).forEach(entry => {
+        const manifestText = net.fetchText(prefix + entry.file)
+        if (manifestText === null) {
+            printerrln(`  ! mirror "${mirrorName}" missing ${entry.file}`)
+            return
+        }
+        const m = parseManifest(manifestText)
+        m._mirrorName   = mirrorName
+        m._mirrorPrefix = prefix
+        m._manifestUrl  = prefix + entry.file
+        out.push(m)
+    })
+    return out
+}
+
+// Per-invocation memoisation. Search and install both pull the same
+// data; we only want to hit the network once per `hopper ...` call.
+let _remoteCache = null
+
+function fetchRemoteCandidates() {
+    if (_remoteCache !== null) return _remoteCache
+
+    const mirrors = loadMirrorList()
+    if (mirrors.length === 0) {
+        _remoteCache = []
+        return _remoteCache
+    }
+
+    if (!net.isAvailable()) {
+        printerrln("Warning: no HTTP modem attached; remote mirrors will be skipped.")
+        _remoteCache = []
+        return _remoteCache
+    }
+
+    const out = []
+    mirrors.forEach(prefix => {
+        fetchManifestsFromMirror(prefix).forEach(m => out.push(m))
+    })
+    _remoteCache = out
+    return _remoteCache
+}
+
+// ============================================================
+// Search
+// ============================================================
+
+function fieldCandidates(manifest, field) {
+    switch (field) {
+        case "provides":    return splitList(manifest.HopperProvides || "")
+        case "requires":    return splitList(manifest.HopperRequires || "")
+        case "description": return [manifest.ProperDescription || ""]
+        case "author":      return [manifest.ProperAuthor || ""]
+        default:            return [manifest.ProperName || "", manifest.HopperPackageName || ""]
+    }
+}
+
+function matchesQuery(manifest, field, query) {
+    const q = query.toLowerCase()
+    return fieldCandidates(manifest, field).some(c => c.toLowerCase().indexOf(q) >= 0)
+}
+
+function printSearchResult(m, origin) {
+    const name = m.ProperName || m.HopperPackageName || "(unnamed)"
+    const ver  = m.HopperPackageVersion || "?"
+    println(`  [${origin}] ${name} -- ${m.HopperPackageName} ${ver}`)
+    if (m.ProperDescription) println(`           ${m.ProperDescription}`)
+}
+
+function cmdSearch(args) {
+    let field = "name"
+    let query = undefined
+    for (let i = 0; i < args.length; i++) {
+        const a = args[i]
+        if      (a === "--provides")    field = "provides"
+        else if (a === "--requires")    field = "requires"
+        else if (a === "--description") field = "description"
+        else if (a === "--author")      field = "author"
+        else if (a.startsWith("--"))    { printerrln(`Unknown option: ${a}`); return 1 }
+        else                            query = a
+    }
+    if (query === undefined) {
+        printerrln("Usage: hopper search [--provides|--requires|--description|--author] <query>")
+        return 1
+    }
+
+    println(`Searching installed packages in ${SYSTEM_PACKEAGE_DEF_DIR} ...`)
+    const sysHits = listInstalledManifests().filter(m => matchesQuery(m, field, query))
+    if (sysHits.length === 0) println("  (no matches)")
+    else sysHits.forEach(m => printSearchResult(m, "installed"))
+
+    println("")
+    println("Searching remote mirrors ...")
+    const remote = fetchRemoteCandidates()
+    if (remote.length === 0) {
+        println("  (no mirrors configured or reachable)")
+    }
+    else {
+        const netHits = remote.filter(m => matchesQuery(m, field, query))
+        if (netHits.length === 0) println("  (no matches)")
+        else netHits.forEach(m => printSearchResult(m, m._mirrorName || "remote"))
+    }
+
+    return 0
+}
+
+// ============================================================
+// Install
+// ============================================================
+//
+// Each upstream manifest declares its payload via `PackageFileList`,
+// a semicolon-separated list of full URLs. Hopper fetches each URL and
+// drops the result in /hopper/bin (default) or /hopper/include (.mjs).
+// The locally-saved manifest gets a `SystemPackagePath` field appended
+// listing the resulting absolute paths, which is what `cmdRemove` later
+// walks to clean up.
+
+function _installOne(action, candidate) {
+    const m = candidate.manifest
+    const files_ = parsePackageFileList(m.PackageFileList)
+    if (files_.length === 0) {
+        printerrln(`  ! ${candidate.name}: upstream manifest has no PackageFileList; cannot install`)
+        return false
+    }
+
+    // Fetch first, write second: a single 404 should not leave a
+    // half-installed package behind.
+    const fetched = []
+    for (let i = 0; i < files_.length; i++) {
+        const f = files_[i]
+        println(`  fetch  ${f.url}`)
+        const body = net.fetchText(f.url)
+        if (body === null || body === undefined) {
+            printerrln(`  ! failed to fetch ${f.url}`)
+            return false
+        }
+        fetched.push({ entry: f, body: body })
+    }
+
+    // If we are replacing an existing user-installed copy, remove its
+    // old files first so a renamed payload doesn't leave orphans.
+    if (action !== "install") {
+        const oldManifestPath = `${USER_PACKAGE_DEF_DIR}/${candidate.name}.${MANIFEST_EXT}`
+        const old = readManifestFile(oldManifestPath)
+        if (old !== undefined) {
+            splitList(old.SystemPackagePath || "").forEach(p => {
+                expandSystemPath(p).forEach(abs => {
+                    const fd = files.open(abs)
+                    if (fd.exists) {
+                        try { fd.remove() }
+                        catch (e) { printerrln(`  ! could not remove old ${abs}: ${e}`) }
+                    }
+                })
+            })
+        }
+    }
+
+    // Write payload files.
+    fetched.forEach(item => {
+        const fd = files.open(item.entry.localPath)
+        if (!fd.exists) fd.mkFile()
+        fd.swrite(item.body)
+        println(`  write  ${item.entry.localPath}`)
+    })
+
+    // Save the manifest with SystemPackagePath appended.
+    const sysPath = fetched.map(item => declarablePath(item.entry.localPath)).join(";")
+    const manifestPath = `${USER_PACKAGE_DEF_DIR}/${candidate.name}.${MANIFEST_EXT}`
+    const mfd = files.open(manifestPath)
+    if (!mfd.exists) mfd.mkFile()
+    mfd.swrite(serializeManifest(m, sysPath))
+    println(`  write  ${manifestPath}`)
+    return true
+}
+
+function cmdInstall(args) {
+    let query = undefined
+    let version = undefined
+    for (let i = 0; i < args.length; i++) {
+        if (args[i] === "-v") { version = args[i + 1]; i++ }
+        else if (args[i].startsWith("--")) { printerrln(`Unknown option: ${args[i]}`); return 1 }
+        else query = args[i]
+    }
+    if (query === undefined) {
+        printerrln("Usage: hopper install <package> [-v <version>]")
+        return 1
+    }
+
+    const targetConstraint = version || "*"
+    const verSuffix = (targetConstraint !== "*") ? ` (${targetConstraint})` : ""
+    println(`Resolving ${query}${verSuffix} ...`)
+
+    const idx = buildCandidateIndex()
+
+    // Sanity check: target must exist in the index (installed or upstream).
+    if (findProviders(idx, query).length === 0) {
+        printerrln(`Error: package "${query}" not found (not on upstream, not installed).`)
+        return 4
+    }
+
+    // Seed order matters: the target goes FIRST so its (possibly tight)
+    // constraints can drive upgrades of dependencies. The installed-set
+    // requirements follow at "*" so the resolver still has to keep them
+    // alive (preferring installed candidates when their version still fits,
+    // otherwise upgrading or downgrading them).
+    const seed = [{ name: query, constraint: targetConstraint }]
+    listInstalledManifests().forEach(m => {
+        if (m.HopperPackageName === query) return
+        seed.push({ name: m.HopperPackageName, constraint: "*" })
+    })
+
+    const { chosen, issues } = resolveAll(idx, seed)
+    if (issues.length > 0) {
+        printerrln("Resolution failed:")
+        issues.forEach(reason => printerrln(`  - ${reason}`))
+        printerrln("")
+        printerrln("No solution found -- not installable.")
+        return 3
+    }
+
+    const plan = classifyPlan(idx, chosen)
+    printPlan(plan, query)
+
+    const changing = plan.filter(a => a.action !== "keep")
+    if (changing.length === 0) return 0
+
+    // Pre-flight: refuse to clobber system packages, and require every
+    // upstream candidate to actually carry a payload list.
+    const blockers = []
+    changing.forEach(a => {
+        const cand = chosen.get(a.name)
+        const inst = findInstalledManifest(a.name)
+        if (inst && inst._origin === "system") {
+            blockers.push(`${a.name}: cannot ${a.action} -- a system package with that name is already installed`)
+        }
+        if (cand && cand.source === "upstream" && !(cand.manifest.PackageFileList && cand.manifest.PackageFileList.length > 0)) {
+            blockers.push(`${a.name}: upstream manifest declares no PackageFileList`)
+        }
+    })
+    if (blockers.length > 0) {
+        printerrln("Cannot proceed:")
+        blockers.forEach(b => printerrln(`  - ${b}`))
+        return 5
+    }
+
+    if (!net.isAvailable()) {
+        printerrln("No HTTP modem attached; cannot fetch package files.")
+        return 6
+    }
+
+    println("")
+    if (!confirm("Proceed with installation?", true)) {
+        println("Aborted.")
+        return 0
+    }
+
+    ensureUserDirs()
+
+    let failed = 0
+    for (let i = 0; i < changing.length; i++) {
+        const a = changing[i]
+        const cand = chosen.get(a.name)
+        if (a.action === "install" || a.action === "reinstall") {
+            println(`${a.action} ${a.name} ${a.version}`)
+        } else {
+            println(`${a.action} ${a.name} ${a.from} -> ${a.to}`)
+        }
+        if (!_installOne(a.action, cand)) {
+            failed++
+            printerrln(`  ! ${a.name}: aborted`)
+            break
+        }
+    }
+    if (failed > 0) {
+        printerrln(`${failed} package(s) failed to install.`)
+        return 7
+    }
+
+    println("Done.")
+    return 0
+}
+
+// ============================================================
+// Remove
+// ============================================================
+
+// Convert a SystemPackagePath entry (e.g. "/tvdos/bin/taut*") into a
+// concrete list of files on the A: drive. Supports a simple '*' wildcard
+// in the filename component.
+function expandSystemPath(pattern) {
+    const sysDrive = "A:"
+
+    if (pattern.indexOf("*") < 0) {
+        return [`${sysDrive}${pattern}`]
+    }
+
+    const fwd = pattern.lastIndexOf("/")
+    const bck = pattern.lastIndexOf("\\")
+    const lastSep = Math.max(fwd, bck)
+    const dirPart  = (lastSep < 0) ? "" : pattern.substring(0, lastSep)
+    const namePart = (lastSep < 0) ? pattern : pattern.substring(lastSep + 1)
+
+    const dir = files.open(`${sysDrive}${dirPart}/`)
+    if (!dir.exists || !dir.isDirectory) return []
+
+    const escaped = namePart.replace(/[.+^${}()|[\]\\]/g, "\\$&").replace(/\*/g, ".*")
+    const re = new RegExp(`^${escaped}$`, "i")
+
+    const out = []
+    dir.list().forEach(entry => {
+        if (entry.isDirectory) return
+        if (re.test(entry.name)) out.push(entry.fullPath)
+    })
+    return out
+}
+
+function cmdRemove(args) {
+    const query = args[0]
+    if (query === undefined) {
+        printerrln("Usage: hopper remove <package>")
+        return 1
+    }
+
+    const m = findInstalledManifest(query)
+    if (m === undefined) {
+        printerrln(`Package not installed: ${query}`)
+        return 2
+    }
+    if (m._origin === "system") {
+        printerrln(`Cannot remove ${query}: it is a system package.`)
+        return 6
+    }
+
+    const name = m.ProperName || m.HopperPackageName || query
+    const ver  = m.HopperPackageVersion || "?"
+    println(`Preparing removal of ${name} (${m.HopperPackageName} ${ver}) ...`)
+
+    const paths = splitList(m.SystemPackagePath || "")
+    println("")
+    println("The following files will be deleted:")
+    if (paths.length === 0) {
+        println("  (manifest declares no files)")
+    }
+    paths.forEach(p => {
+        const expanded = expandSystemPath(p)
+        if (expanded.length === 0) {
+            println(`  (no match on disk) ${p}`)
+        }
+        else {
+            expanded.forEach(e => println(`  ${e}`))
+        }
+    })
+    println(`  ${m._manifestPath}`)
+
+    println("")
+    if (!confirm("Proceed with removal?", false)) {
+        println("Aborted.")
+        return 0
+    }
+
+    const removed = deleteInstalledFiles(m)
+    removed.forEach(p => println(`  removed ${p}`))
+    if (removed.length === 0) println("  (nothing was removed)")
+    return 0
+}
+
+// ============================================================
+// Dispatch
+// ============================================================
+
+function printUsage() {
+    println("Hopper - Package manager for TVDOS")
+    println("")
+    println("Usage:")
+    println("  hopper {search,se} [--provides|--requires|--description|--author] <query>")
+    println("  hopper {install,in} <package> [-v <version>]")
+    println("  hopper {remove,rm} <package>")
+}
+
+const _hopperArgs = (typeof exec_args !== "undefined" && exec_args) ? exec_args.slice(1) : []
+const _hopperCmd  = _hopperArgs[0]
+const _hopperRest = _hopperArgs.slice(1)
+
+switch (_hopperCmd) {
+    case "search":
+    case "se":
+        return cmdSearch(_hopperRest)
+    case "install":
+    case "in":
+        return cmdInstall(_hopperRest)
+    case "remove":
+    case "rm":
+        return cmdRemove(_hopperRest)
+    case undefined:
+        printUsage()
+        return 0
+    default:
+        printerrln(`Unknown command: ${_hopperCmd}`)
+        printUsage()
+        return 1
+}

assets/disk0/tvdos/bin/lfs.js

@@ -15,7 +15,10 @@ Uint16  Encoding
     10 00 : UTF-8
     10 01 : UTF-16BE
     10 02 : UTF-16LE
-Byte[5] Padding
+Byte    Flags
+    0b 0000 000r
+        r: path is relative
+Bytes[4] Reserved
 
 # FileBlocks
 Uint8    File type (only 1 is used)
@@ -28,27 +31,36 @@ instead of compressing individual files)
 
 function printUsage() {
     println(`Collects files under a directory into a single archive.
-Usage: lfs [-c/-x/-t] dest.lfs path\\to\\source
+Usage: lfs [-c/-x/-t] [-r] dest.lfs path\\to\\source
 To collect a directory into myarchive.lfs:
        lfs -c myarchive.lfs path\\to\\directory
+To collect a directory into myarchive.lfs, using relative path:
+       lfs -c -r myarchive.lfs path\\to\\directory
 To extract an archive to path\\to\\my\\files:
        lfs -x myarchive.lfs path\\to\\my\\files
 To list the collected files:
        lfs -t myarchive.lfs`)
 }
 
-let option = exec_args[1]
+let option = undefined
-const lfsPath = exec_args[2]
+let useRelative = false
-const dirPath = exec_args[3]
+const positional = []
+for (let i = 1; i < exec_args.length; i++) {
+    const a = exec_args[i]
+    if (a === undefined) continue
+    const au = a.toUpperCase()
+    if (au === "-C" || au === "-X" || au === "-T") option = au
+    else if (au === "-R") useRelative = true
+    else positional.push(a)
+}
+const lfsPath = positional[0]
+const dirPath = positional[1]
 
-
+if (option === undefined || lfsPath === undefined || (option != "-T" && dirPath === undefined)) {
-if (option === undefined || lfsPath === undefined || option.toUpperCase() != "-T" && dirPath === undefined) {
     printUsage()
     return 0
 }
 
-option = option.toUpperCase()
-
 
 function recurseDir(file, action) {
     if (!file.isDirectory) {
@@ -76,13 +88,14 @@ if ("-C" == option) {
         return 1
     }
 
-    let out = "TVDOSLFS\x01\x00\x00\x00\x00\x00\x00\x00"
+    const flagsByte = useRelative ? 0x01 : 0x00
+    let out = "TVDOSLFS\x01\x00\x00" + String.fromCharCode(flagsByte) + "\x00\x00\x00\x00"
     const rootDirPathLen = rootDir.fullPath.length
 
     recurseDir(rootDir, file=>{
         let f = files.open(file.fullPath)
         let flen = f.size
-        let fname = file.fullPath.substring(rootDirPathLen + 1)
+        let fname = useRelative ? file.fullPath.substring(rootDirPathLen + 1) : file.fullPath
         let plen = fname.length
 
         out += "\x01" + String.fromCharCode(
@@ -116,6 +129,8 @@ else if ("-T" == option || "-X" == option) {
         return 2
     }
 
+    const archiveRelative = (bytes.charCodeAt(11) & 0x01) !== 0
+
     if ("-X" == option && !rootDir.exists) {
         rootDir.mkDir()
     }
@@ -132,9 +147,12 @@ else if ("-T" == option || "-X" == option) {
 
         if ("-X" == option) {
             let filebytes = bytes.substring(curs, curs + filelen)
-            let outfile = files.open(`${rootDir.fullPath}\\${path}`)
+            // Fully qualified paths (e.g. "A:\foo\bar.txt") get their drive prefix
+            // stripped so the archive contents re-root under the destination dir.
+            let subPath = archiveRelative ? path : path.replace(/^[A-Za-z]:[\\\/]?/, "")
+            let outfile = files.open(`${rootDir.fullPath}\\${subPath}`)
 
-            mkDirs(files.open(`${rootDir.driveLetter}:${files.open(`${rootDir.fullPath}\\${path}`).parentPath}`))
+            mkDirs(files.open(`${outfile.driveLetter}:${outfile.parentPath}`))
             outfile.mkFile()
             outfile.swrite(filebytes)
         }

assets/disk0/tvdos/bin/microtone.alias

@@ -0,0 +1 @@
+taut $0

assets/disk0/tvdos/bin/playmv1.js

@@ -326,7 +326,7 @@ while (!stopPlay && seqread.getReadCount() < FILE_LENGTH) {
                     // RAW PCM packets (decode on the fly)
                     else if (packetType == 0x1000 || packetType == 0x1001) {
                         let frame = seqread.readBytes(readLength)
-                        audio.putPcmDataByPtr(frame, readLength, 0)
+                        audio.putPcmDataByPtr(0, frame, readLength, 0)
                         audio.setSampleUploadLength(0, readLength)
                         audio.startSampleUpload(0)
                         sys.free(frame)

assets/disk0/tvdos/bin/playpcm.js

@@ -162,7 +162,7 @@ while (!stopPlay && seqread.getReadCount() < FILE_SIZE && readLength > 0) {
 
             seqread.readBytes(readLength, readPtr)
 
-            audio.putPcmDataByPtr(readPtr, readLength, 0)
+            audio.putPcmDataByPtr(0, readPtr, readLength, 0)
             audio.setSampleUploadLength(0, readLength)
             audio.startSampleUpload(0)
 

assets/disk0/tvdos/bin/playtad.js

@@ -1,7 +1,9 @@
 const SND_BASE_ADDR = audio.getBaseAddr()
 const SND_MEM_ADDR = audio.getMemAddr()
-const TAD_INPUT_ADDR = SND_MEM_ADDR - 262144  // TAD input buffer (matches TAV packet 0x24)
+// tadInputBin lives at audio-local offset 917504 and tadDecodedBin at 983040
-const TAD_DECODED_ADDR = SND_MEM_ADDR - 262144 + 65536  // TAD decoded buffer
+// (post-bef85f6 memory map; the old 262144 offset now hits the enlarged sampleBin).
+const TAD_INPUT_ADDR = SND_MEM_ADDR - 917504  // TAD input buffer (matches TAV packet 0x24)
+const TAD_DECODED_ADDR = SND_MEM_ADDR - 983040  // TAD decoded buffer
 
 if (!SND_BASE_ADDR) return 10
 

assets/disk0/tvdos/bin/playtav.js

@@ -9,6 +9,7 @@ const MAXMEM = sys.maxmem()
 const WIDTH = 560
 const HEIGHT = 448
 const TAV_MAGIC = [0x1F, 0x54, 0x53, 0x56, 0x4D, 0x54, 0x41, 0x56] // "\x1FTSVM TAV"
+const TAP_MAGIC = [0x1F, 0x54, 0x53, 0x56, 0x4D, 0x54, 0x41, 0x50] // "\x1FTSVM TAP"
 const UCF_MAGIC = [0x1F, 0x54, 0x53, 0x56, 0x4D, 0x55, 0x43, 0x46] // "\x1FTSVM UCF"
 const TAV_VERSION = 1  // Initial DWT version
 const UCF_VERSION = 1
@@ -17,6 +18,7 @@ const ADDRESSING_INTERNAL = 0x02
 const SND_BASE_ADDR = audio.getBaseAddr()
 const SND_MEM_ADDR = audio.getMemAddr()
 const pcm = require("pcm")
+const AUDIO_DEVICE = 0
 const MP2_FRAME_SIZE = [144,216,252,288,360,432,504,576,720,864,1008,1152,1440,1728]
 const TAV_TEMPORAL_LEVELS = 2
 
@@ -151,13 +153,10 @@ graphics.clearPixels4(0)
 const gpuGraphicsMode = graphics.getGraphicsMode()
 
 // Initialize audio
-audio.resetParams(0)
+audio.resetParams(AUDIO_DEVICE)
-audio.purgeQueue(0)
+audio.purgeQueue(AUDIO_DEVICE)
-audio.setPcmMode(0)
+audio.setPcmMode(AUDIO_DEVICE)
-audio.setMasterVolume(0, 255)
+audio.setMasterVolume(AUDIO_DEVICE, 255)
-
-// set colour zero as half-opaque black
-graphics.setPalette(0, 0, 0, 0, 7)
 
 // Parse SSF-TC subtitle packet and add to event buffer (0x31)
 function parseSubtitlePacketTC(packetSize) {
@@ -367,6 +366,8 @@ let header = {
     width: 0,
     height: 0,
     fps: 0,
+    fps_num: 0,           // Fractional FPS numerator (from XFPS or derived from fps)
+    fps_den: 1,           // Fractional FPS denominator (from XFPS, default 1)
     totalFrames: 0,
     waveletFilter: 0,     // TAV-specific: wavelet filter type
     decompLevels: 0,      // TAV-specific: decomposition levels
@@ -381,6 +382,22 @@ let header = {
     fileRole: 0
 }
 
+// Helper function to parse XFPS string ("num/den" format) and update header
+function parseXFPS(xfpsStr) {
+    let parts = xfpsStr.split("/")
+    if (parts.length === 2) {
+        let num = parseInt(parts[0], 10)
+        let den = parseInt(parts[1], 10)
+        if (!isNaN(num) && !isNaN(den) && den > 0) {
+            header.fps_num = num
+            header.fps_den = den
+            header.fps = num / den
+            return true
+        }
+    }
+    return false
+}
+
 // Read and validate header
 for (let i = 0; i < 8; i++) {
     header.magic[i] = seqread.readOneByte()
@@ -389,7 +406,7 @@ for (let i = 0; i < 8; i++) {
 // Validate magic number
 let magicValid = true
 for (let i = 0; i < 8; i++) {
-    if (header.magic[i] !== TAV_MAGIC[i]) {
+    if (header.magic[i] !== TAV_MAGIC[i] &&header.magic[i] !== TAP_MAGIC[i] ) {
         magicValid = false
         break
     }
@@ -401,10 +418,16 @@ if (!magicValid) {
     return
 }
 
+// Check if this is a TAP still image file (magic ends with 'P' instead of 'V')
+const isTapFile = (header.magic[7] === TAP_MAGIC[7])
+
 header.version = seqread.readOneByte()
 header.width = seqread.readShort()
 header.height = seqread.readShort()
 header.fps = seqread.readOneByte()
+// Set default fractional fps (will be overridden by XFPS if present)
+header.fps_num = header.fps
+header.fps_den = 1
 header.totalFrames = seqread.readInt()
 header.waveletFilter = seqread.readOneByte()
 header.decompLevels = seqread.readOneByte()
@@ -457,7 +480,7 @@ const isLossless = (header.videoFlags & 0x04) !== 0
 
 console.log(`TAV Decoder`)
 console.log(`Resolution: ${header.width}x${header.height}`)
-console.log(`FPS: ${header.fps}`)
+console.log(`FPS: ${header.fps === 255 ? "(see XFPS)" : header.fps}`)
 console.log(`Total frames: ${header.totalFrames}`)
 console.log(`Wavelet filter: ${header.waveletFilter === WAVELET_5_3_REVERSIBLE ? "5/3 reversible" : header.waveletFilter === WAVELET_9_7_IRREVERSIBLE ? "9/7 irreversible" : header.waveletFilter === WAVELET_BIORTHOGONAL_13_7 ? "Biorthogonal 13/7" : header.waveletFilter === WAVELET_DD4 ? "DD-4" : header.waveletFilter === WAVELET_HAAR ? "Haar" : "unknown"}`)
 console.log(`Decomposition levels: ${header.decompLevels}`)
@@ -469,6 +492,135 @@ console.log(`Features: ${hasAudio ? "Audio " : ""}${hasSubtitles ? "Subtitles "
 console.log(`Video flags raw: 0x${header.videoFlags.toString(16)}`)
 console.log(`Scan type: ${isInterlaced ? "Interlaced" : "Progressive"}`)
 
+// Handle TAP still image file
+if (isTapFile) {
+    console.log("TAP still image detected")
+
+    // Allocate single frame buffer for still image
+    const FRAME_PIXELS = header.width * header.height
+    const FRAME_SIZE = FRAME_PIXELS * 3
+
+    const RGB_BUFFER = sys.malloc(FRAME_SIZE)
+    const PREV_RGB_BUFFER = sys.malloc(FRAME_SIZE)
+    sys.memset(RGB_BUFFER, 0, FRAME_SIZE)
+    sys.memset(PREV_RGB_BUFFER, 0, FRAME_SIZE)
+
+    // Read the image packet (should be I-frame)
+    let packetType = seqread.readOneByte()
+
+    // Skip non-video packets until we find the image data
+    while (packetType !== TAV_PACKET_IFRAME) {
+        if (packetType === TAV_PACKET_EXTENDED_HDR) {
+            // Parse extended header - look for XFPS
+            let numPairs = seqread.readShort()
+            for (let i = 0; i < numPairs; i++) {
+                // Read key (4 bytes)
+                let keyBytes = seqread.readBytes(4)
+                let key = ""
+                for (let j = 0; j < 4; j++) {
+                    key += String.fromCharCode(sys.peek(keyBytes + j))
+                }
+                sys.free(keyBytes)
+
+                // Read value type and value
+                let valueType = seqread.readOneByte()
+                if (valueType === 0x04) {  // Uint64 - 8 bytes
+                    seqread.skip(8)
+                } else if (valueType === 0x10) {  // Bytes - length-prefixed
+                    let length = seqread.readShort()
+                    let dataBytes = seqread.readBytes(length)
+                    // Check for XFPS key
+                    if (key === "XFPS") {
+                        let xfpsStr = ""
+                        for (let j = 0; j < length; j++) {
+                            xfpsStr += String.fromCharCode(sys.peek(dataBytes + j))
+                        }
+                        parseXFPS(xfpsStr)
+                    }
+                    sys.free(dataBytes)
+                }
+            }
+        } else if (packetType === TAV_PACKET_SCREEN_MASK) {
+            // Skip screen mask packet - single entry: frame_num(4) + top(2) + right(2) + bottom(2) + left(2)
+            seqread.skip(12)
+        } else if (packetType === TAV_PACKET_TIMECODE) {
+            seqread.skip(8)
+        } else {
+            console.log(`got unknown packet type 0x${packetType.toString(16)}`)
+            let size = seqread.readInt()
+            seqread.skip(size)
+        }
+        packetType = seqread.readOneByte()
+    }
+
+    if (packetType === TAV_PACKET_IFRAME) {
+        // Read and decode I-frame
+        const compressedSize = seqread.readInt()
+        const compressedPtr = seqread.readBytes(compressedSize)
+
+        // Decode using TAV hardware decoder
+        graphics.tavDecodeCompressed(
+            compressedPtr, compressedSize,
+            RGB_BUFFER, PREV_RGB_BUFFER,
+            header.width, header.height,
+            header.qualityLevel,
+            QLUT[header.qualityY], QLUT[header.qualityCo], QLUT[header.qualityCg],
+            header.channelLayout, 0, header.waveletFilter, header.decompLevels,
+            isLossless, header.version, header.entropyCoder, 2
+        )
+        sys.free(compressedPtr)
+
+        // Upload to framebuffer
+        graphics.uploadRGBToFramebuffer(RGB_BUFFER, header.width, header.height, 0, false)
+
+    }
+
+    // Free buffers
+    sys.free(RGB_BUFFER)
+    sys.free(PREV_RGB_BUFFER)
+
+    // Show "backspace to exit" message
+    con.clear()
+    con.curs_set(0)
+    con.move(1, 1)
+    println("Push and hold Backspace to exit")
+
+    // Wait loop for still image viewing (similar to decodeipf.js)
+    let wait = true
+    let t1 = sys.nanoTime()
+    let tapNotifHideTimer = 0
+    const TAP_NOTIF_SHOWUPTIME = 3000000000  // 3 seconds
+
+    while (wait) {
+        sys.poke(-40, 1)
+        if (sys.peek(-41) == 67) {  // Backspace
+            wait = false
+            con.curs_set(1)
+        }
+
+        sys.sleep(50)
+
+        let t2 = sys.nanoTime()
+        tapNotifHideTimer += (t2 - t1)
+        if (tapNotifHideTimer > TAP_NOTIF_SHOWUPTIME) {
+            con.clear()
+        }
+        t1 = t2
+    }
+
+    // Clean up and exit (matching normal video playback cleanup)
+    con.clear()
+    con.curs_set(1)
+
+    // Reset font ROM
+    sys.poke(-1299460, 20)
+    sys.poke(-1299460, 21)
+
+    graphics.setPalette(0, 0, 0, 0, 0)
+    con.move(cy, cx) // restore cursor
+    return errorlevel
+}
+
 // Adjust decode height for interlaced content
 // For interlaced: header.height is display height (448)
 // Each field is half of display height (448/2 = 224)
@@ -998,10 +1150,10 @@ try {
                 else if (keyCode == 62) { // SPACE - pause/resume
                     paused = !paused
                     if (paused) {
-                        audio.stop(0)
+                        audio.stop(AUDIO_DEVICE)
                         serial.println(`Paused at frame ${frameCount}`)
                     } else {
-                        audio.play(0)
+                        audio.play(AUDIO_DEVICE)
                         serial.println(`Resumed`)
                     }
                 }
@@ -1022,10 +1174,10 @@ try {
                         baseTimecodeFrameCount = 0
                         currentTimecodeNs = 0
                         nextSubtitleEventIndex = 0  // Reset subtitle event processing
-                        audio.purgeQueue(0)
+                        audio.purgeQueue(AUDIO_DEVICE)
                         if (paused) {
-                            audio.play(0)
+                            audio.play(AUDIO_DEVICE)
-                            audio.stop(0)
+                            audio.stop(AUDIO_DEVICE)
                         }
                         skipped = true
                     }
@@ -1047,10 +1199,10 @@ try {
                         baseTimecodeFrameCount = 0
                         currentTimecodeNs = 0
                         nextSubtitleEventIndex = 0  // Reset subtitle event processing
-                        audio.purgeQueue(0)
+                        audio.purgeQueue(AUDIO_DEVICE)
                         if (paused) {
-                            audio.play(0)
+                            audio.play(AUDIO_DEVICE)
-                            audio.stop(0)
+                            audio.stop(AUDIO_DEVICE)
                         }
                         skipped = true
                     }
@@ -1078,10 +1230,10 @@ try {
                                 break
                             }
                         }
-                        audio.purgeQueue(0)
+                        audio.purgeQueue(AUDIO_DEVICE)
                         if (paused) {
-                            audio.play(0)
+                            audio.play(AUDIO_DEVICE)
-                            audio.stop(0)
+                            audio.stop(AUDIO_DEVICE)
                         }
                         skipped = true
                     }
@@ -1117,10 +1269,10 @@ try {
                                 break
                             }
                         }
-                        audio.purgeQueue(0)
+                        audio.purgeQueue(AUDIO_DEVICE)
                         if (paused) {
-                            audio.play(0)
+                            audio.play(AUDIO_DEVICE)
-                            audio.stop(0)
+                            audio.stop(AUDIO_DEVICE)
                         }
                         skipped = true
                     } else if (!seekTarget) {
@@ -1159,7 +1311,7 @@ try {
                     baseTimecodeFrameCount = 0
                     currentTimecodeNs = 0
                     nextSubtitleEventIndex = 0  // Reset subtitle event processing
-                    audio.purgeQueue(0)
+                    audio.purgeQueue(AUDIO_DEVICE)
                     currentFileIndex++
                     if (skipped) {
                         skipped = false
@@ -1170,7 +1322,7 @@ try {
 
                     console.log(`\nStarting file ${currentFileIndex}:`)
                     console.log(`Resolution: ${header.width}x${header.height}`)
-                    console.log(`FPS: ${header.fps}`)
+                    console.log(`FPS: ${header.fps === 255 ? "(see XFPS)" : header.fps}`)
                     console.log(`Total frames: ${header.totalFrames}`)
                     console.log(`Wavelet filter: ${header.waveletFilter === WAVELET_5_3_REVERSIBLE ? "5/3 reversible" : header.waveletFilter === WAVELET_9_7_IRREVERSIBLE ? "9/7 irreversible" : header.waveletFilter === WAVELET_BIORTHOGONAL_13_7 ? "Biorthogonal 13/7" : header.waveletFilter === WAVELET_DD4 ? "DD-4" : header.waveletFilter === WAVELET_HAAR ? "Haar" : "unknown"}`)
                     console.log(`Quality: Y=${header.qualityY}, Co=${header.qualityCo}, Cg=${header.qualityCg}`)
@@ -1583,7 +1735,7 @@ try {
 
                 seqread.readBytes(audioLen, SND_BASE_ADDR - 2368)
                 audio.mp2Decode()
-                audio.mp2UploadDecoded(0)
+                audio.mp2UploadDecoded(AUDIO_DEVICE)
 
             }
             else if (packetType === TAV_PACKET_AUDIO_TAD) {
@@ -1594,9 +1746,11 @@ try {
                     tadInitialised = true
                 }
 
-                seqread.readBytes(payloadLen, SND_MEM_ADDR - 262144)
+                // tadInputBin lives at audio-local offset 917504 (post-bef85f6 memory map);
+                // the previous 262144 offset now points into the enlarged sampleBin.
+                seqread.readBytes(payloadLen, SND_MEM_ADDR - 917504)
                 audio.tadDecode()
-                audio.tadUploadDecoded(0, sampleLen)
+                audio.tadUploadDecoded(AUDIO_DEVICE, sampleLen)
             }
             else if (packetType === TAV_PACKET_AUDIO_NATIVE) {
                 // PCM length must not exceed 65536 bytes!
@@ -1608,10 +1762,10 @@ try {
                 let pcmLen = gzip.decompFromTo(zstdPtr, zstdLen, pcmPtr) // <- segfaults!
                 if (pcmLen > 65536) throw Error(`PCM data too long -- got ${pcmLen} bytes`)
 
-                audio.putPcmDataByPtr(pcmPtr, pcmLen, 0)
+                audio.putPcmDataByPtr(AUDIO_DEVICE, pcmPtr, pcmLen, 0)
 
-                audio.setSampleUploadLength(0, pcmLen)
+                audio.setSampleUploadLength(AUDIO_DEVICE, pcmLen)
-                audio.startSampleUpload(0)
+                audio.startSampleUpload(AUDIO_DEVICE)
                 sys.free(zstdPtr)
 
                 sys.free(pcmPtr)
@@ -1704,7 +1858,19 @@ try {
                         }
                         sys.free(dataBytes)
 
-                        if (interactive) {
+                        // Parse XFPS if present (always try, not just when fps=255)
+                        if (key === "XFPS") {
+                            if (parseXFPS(dataStr)) {
+                                // Update frame timing with new fps
+                                frametime = 1000000000.0 / header.fps
+                                FRAME_TIME = 1.0 / header.fps
+                                if (interactive) {
+                                    serial.println(`  ${key}: ${dataStr} -> ${header.fps.toFixed(3)} fps`)
+                                }
+                            } else if (interactive) {
+                                serial.println(`  ${key}: "${dataStr}" (parse failed)`)
+                            }
+                        } else if (interactive) {
                             serial.println(`  ${key}: "${dataStr}"`)
                         }
                     } else {
@@ -1883,7 +2049,7 @@ try {
 
                 // Fire audio on first frame
                 if (!audioFired) {
-                    audio.play(0)
+                    audio.play(AUDIO_DEVICE)
                     audioFired = true
                 }
 
@@ -1971,7 +2137,7 @@ try {
 
                 // Fire audio on first frame
                 if (!audioFired) {
-                    audio.play(0)
+                    audio.play(AUDIO_DEVICE)
                     audioFired = true
                 }
 
@@ -2007,8 +2173,8 @@ try {
                     sys.memcpy(predecodedPcmBuffer + predecodedPcmOffset, SND_BASE_ADDR, uploadSize)
 
                     // Set upload parameters and trigger upload to queue
-                    audio.setSampleUploadLength(0, uploadSize)
+                    audio.setSampleUploadLength(AUDIO_DEVICE, uploadSize)
-                    audio.startSampleUpload(0)
+                    audio.startSampleUpload(AUDIO_DEVICE)
 
                     predecodedPcmOffset += uploadSize
                 }
@@ -2292,10 +2458,10 @@ finally {
     sys.poke(-1299460, 20)
     sys.poke(-1299460, 21)
 
-    audio.stop(0)
+    audio.stop(AUDIO_DEVICE)
-    audio.purgeQueue(0)
+    audio.purgeQueue(AUDIO_DEVICE)
 }
 
-graphics.setPalette(0, 0, 0, 0, 0)
+graphics.resetPalette()
 con.move(cy, cx) // restore cursor
 return errorlevel

assets/disk0/tvdos/bin/playucf.js

@@ -307,7 +307,7 @@ for (let i = 0; i < cueElements.length; i++) {
             // Execute the player with modified environment
             exec_args[1] = targetPath
             if (playerFile) {
-                let playerPath = `A:\\tvdos\\bin\\${playerFile}.js`
+                let playerPath = `A:${_TVDOS.variables.DOSDIR}/bin/${playerFile}.js`
                 if (files.open(playerPath).exists) {
                     eval(files.readText(playerPath))
                 } else {
@@ -334,7 +334,7 @@ for (let i = 0; i < cueElements.length; i++) {
     }
 
     // Execute the appropriate player
-    let playerPath = `A:\\tvdos\\bin\\${playerFile}.js`
+    let playerPath = `A:${_TVDOS.variables.DOSDIR}/bin/${playerFile}.js`
     if (!files.open(playerPath).exists) {
         serial.println(`Warning: Player script not found: ${playerPath}`)
         continue

assets/disk0/tvdos/bin/playwav.js

@@ -289,7 +289,7 @@ while (!stopPlay && seqread.getReadCount() < FILE_SIZE - 8) {
                     let decodedSampleLength = decodeInfilePcm(readPtr, decodePtr, readLength)
                     printdbg(`        decodedSampleLength: ${decodedSampleLength}`)
 
-                    audio.putPcmDataByPtr(decodePtr, decodedSampleLength, 0)
+                    audio.putPcmDataByPtr(0, decodePtr, decodedSampleLength, 0)
                     audio.setSampleUploadLength(0, decodedSampleLength)
                     audio.startSampleUpload(0)
 

assets/disk0/tvdos/bin/taut_fileop.js

@@ -0,0 +1,77 @@
+/**
+ * TAUT File Operations
+ * Sub-program launched by taut.js when the File tab is active.
+ * Rows 1-3 are owned by the parent; this program draws rows 4+.
+ *
+ * exec_args[1] = path to .taud file
+ * Sets _G.TAUT.UI.NEXTPANEL before returning to request a panel switch.
+ *
+ * Created by minjaesong on 2026-04-27
+ */
+
+const win = require("wintex")
+
+const PANEL_COUNT = 7
+const MY_PANEL   = 6 // VIEW_FILE
+
+const [SCRH, SCRW] = con.getmaxyx()
+const PANEL_Y = 4
+const PANEL_H = SCRH - PANEL_Y
+
+const colStatus  = 253
+const colContent = 240
+const colHdr     = 230
+
+function drawFileOpContents(wo) {
+    for (let y = PANEL_Y; y < SCRH; y++) {
+        con.move(y, 1)
+        con.color_pair(colContent, 255)
+        print(' '.repeat(SCRW))
+    }
+    con.move(PANEL_Y + 1, 3)
+    con.color_pair(colHdr, 255)
+    print('[ File ]')
+    con.move(PANEL_Y + 3, 3)
+    con.color_pair(colStatus, 255)
+    print('placeholder — not yet implemented')
+}
+
+function drawHints() {
+    con.move(SCRH, 1)
+    con.color_pair(colStatus, 255)
+    print(' '.repeat(SCRW - 1))
+    con.move(SCRH, 1)
+    con.color_pair(colHdr, 255); print('Tab ')
+    con.color_pair(colStatus, 255); print('Panel')
+}
+
+function fileOpInput(wo, event) {
+    // placeholder — no interaction yet
+}
+
+const panel = new win.WindowObject(1, PANEL_Y, SCRW, PANEL_H, fileOpInput, drawFileOpContents, undefined, ()=>{})
+
+panel.drawContents()
+drawHints()
+
+let done = false
+while (!done) {
+    input.withEvent(event => {
+        if (event[0] !== 'key_down') return
+        const keysym     = event[1]
+        const keyJustHit = (1 == event[2])
+        const shiftDown  = (event.includes(59) || event.includes(60))
+
+        if (!keyJustHit) return
+
+        if (keysym === '<TAB>') {
+            _G.TAUT.UI.NEXTPANEL = (MY_PANEL + (shiftDown ? -1 : 1) + PANEL_COUNT) % PANEL_COUNT
+            done = true
+            return
+        }
+
+        panel.processInput(event)
+    })
+}
+
+return 0

assets/disk0/tvdos/bin/taut_helpmsg.js

@@ -0,0 +1,171 @@
+if (!_G.TAUT) _G.TAUT = {};
+let help = {}
+
+let ts = require("typesetter")
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+
+/*
+Tags:
+<b> - print the text in emphasis colour (colVoiceHdr aka 230)
+<c> - centre the line. If the line spans multiple lines, centre each line
+<r> - align right
+<l> - align left
+<o> - create virtual typesetting box. Left anchor: where the text cursor is. Right anchor: end of the line
+&microtone; - replace with the brand string (<col 211>Micro</col><col 239>tone</col>)
+
+&bul; - replace with bullet (\u00F9)
+&ddot; - replace with double-dot (\u008419u)
+&mdot; - replace with BIGDOT (\u00FA)
+&updn; - up-down arrow (\u008418u)
+&udlr; - four direction arrow (\u008428u\u008429u)
+
+&keyoffsym; - pattern view key-off symbol (\u00A0\u00B1\u00B1\u00A1)
+&notecutsym; - pattern view note-cut symbol (\u00A4\u00A4\u00A4\u00A4)
+
+&demisharp;
+&sharp;
+&sesquisharp;
+&doublesharp;
+&triplesharp;
+&quadsharp;
+&demiflat;
+&flat;
+&sesquiflat;
+&doubleflat;
+&tripleflat;
+&quadflat;
+&accuptick;
+&accdntick;
+&accupup;
+&accdndn;
+
+&nbsp; - nonbreakable space (only meaningful for typesetters)
+&shy; - soft hyphen (only meaningful for typesetters)
+
+default alignment: fully justified
+ */
+
+let helpNotation = `<c>CONTROL NOTATION</c>
+<c>\u00B7${'\u00B8'.repeat(16)}\u00B9</c>
+&microtone; <O>shortcuts differentiate normal and shifted shortcuts.</O>
+&bul;<b>a</b>&ddot;<b>z</b> : <O>alphabet without shift-in</O>
+&bul;<b>A</b>&ddot;<b>Z</b> : <O>alphabet with shift-in</O>
+&bul;<b>^q</b> : <O>hit 'q' with control key</O>
+&bul;<b>^Q</b> : <O>hit 'q' with control and shift key</O>
+`
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+
+let helpJam = `<c>NOTE JAMMING</c>
+<c>\u00B7${'\u00B8'.repeat(12)}\u00B9</c>
+Push keys to play or insert notes.
+&nbsp;w&nbsp;e&nbsp;&nbsp;&nbsp;t&nbsp;y&nbsp;u
+a&nbsp;s&nbsp;d&nbsp;f&nbsp;g&nbsp;h&nbsp;j&nbsp;k
+`
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+
+let helpCommon = `<c>COMMON CONTROLS</c>
+<c>\u00B7${'\u00B8'.repeat(15)}\u00B9</c>
+&bul;<b>!</b> : <O>show this help message</O>
+&bul;<b>Y</b> : <O>plays the entire song from the current cue</O>
+&bul;<b>U</b> : <O>plays the current cue then stop</O>
+&bul;<b>I</b> : <O>plays the current row</O>
+&bul;<b>O</b> : <O>stops the playback</O>
+&bul;<b>tab</b> : <O>switchs forward a tab</O>
+&bul;<b>TAB</b> : <O>switchs backward a tab</O>
+&bul;<b>q</b> : <O>closes &microtone;</O>
+`
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+
+let helpTimeline = `<c>TIMELINE VIEW</c>
+<c>\u00B7${'\u00B8'.repeat(13)}\u00B9</c>
+Timeline has two distinct modes: view and edit mode. Two modes are toggled using the space bar.
+
+<b>&nbsp;VIEW MODE</b>
+<b>\u00B7${'\u00B8'.repeat(9)}\u00B9</b>
+&bul;Note jamming : <O>plays the note</O>
+&bul;<b>&udlr;</b> : <O>moves the viewing cursor by voices and rows</O>
+&bul;<b>pg&updn;</b> : <O>goes to previous/next cue</O>
+&bul;<b>W</b>&mdot;<b>E</b>&mdot;<b>R</b> : <O>toggles timeline view mode. W-most detailed, R-most abridged</O>
+&bul;<b>n</b> : <O>toggles soloing of the selected voice</O>
+&bul;<b>m</b> : <O>toggles muting of the selected voice</O>
+&bul;<b>[</b>&mdot;<b>]</b> : <O>changes tick rate of playhead</O>
+
+<b>&nbsp;EDIT MODE</b>
+<b>\u00B7${'\u00B8'.repeat(9)}\u00B9</b>
+&bul;Note jamming : <O>(note column) inserts the note</O>
+&bul;<b>{</b>&mdot;<b>}</b> : <O>(note column) lowers/raises a note by one octave (or period)</O>
+&bul;<b>[</b>&mdot;<b>]</b> : <O>(note column) lowers/raises a note by one unit</O>
+&bul;<b>z</b> : <O>(note column) inserts a key-off &keyoffsym;</O>
+&bul;<b>x</b> : <O>(note column) inserts a note-cut &notecutsym;</O>
+&bul;<b>.</b> : <O>clears fields</O>
+&bul;<b>bksp</b> : <O>deletes one character on the selected column</O>
+&bul;<b>0</b>&ddot;<b>9</b> <b>a</b>&ddot;<b>f</b> : <O>inserts a (hexa)decimal number</O>
+&bul;<b>0</b>&ddot;<b>9</b> <b>a</b>&ddot;<b>z</b> : <O>(fx column) inserts an effect</O>
+&bul;<b>^</b>&mdot;<b>v</b> : <O>(volume column) slide up/down</O>
+&bul;<b>&lt;</b>&mdot;<b>&gt;</b>: <O>(panning column) slide left/right</O>
+&bul;<b>-</b>&mdot;<b>=</b> : <O>(vol/pan col) fine slide down/up</O>
+&bul;<b>&udlr;</b> : <O>moves the viewing cursor by columns and rows</O>
+&bul;<b>pg&updn;</b> : <O>goes to previous/next cue</O>
+
+<b>&nbsp;ACCIDENTALS</b>
+<b>\u00B7${'\u00B8'.repeat(11)}\u00B9</b>
+&demisharp;&nbsp;&sharp;&nbsp;&doublesharp;&nbsp;&triplesharp;&nbsp;&quadsharp;&nbsp;&demiflat;&nbsp;&flat;&nbsp;&doubleflat;&nbsp;&tripleflat;&nbsp;&nbsp;&accuptick;&nbsp;&nbsp;&accupup;&nbsp;&nbsp;&accdntick;&nbsp;&nbsp;&accdndn;
+<b>C&nbsp;&nbsp;c&nbsp;&nbsp;cx&nbsp;x&nbsp;&nbsp;xx&nbsp;B&nbsp;&nbsp;b&nbsp;&nbsp;bb&nbsp;bbb&nbsp;^&nbsp;&nbsp;^^&nbsp;v&nbsp;&nbsp;vv</b>
+
+<b>&nbsp;GLOBAL EDIT</b>
+<b>\u00B7${'\u00B8'.repeat(11)}\u00B9</b>
+&bul;<b>Q</b> : <O>retunes current song into different tuning and strategy. In general, nearest-note works best for macrotonals, nearest-harmonic and nearest-delta works best for highly microtonals (31+); 17- and 19-TET takes nearest-harmonic pretty well, while 22-TET seem to only benefit from the nearest-note</O>
+`
+
+let helpProjectFlags = `<c>MIXER FLAGS</c>
+<c>\u00B7${'\u00B8'.repeat(11)}\u00B9</c>
+Mixer flags define how should the mixer behave.
+
+<b>&nbsp;TONE MODE</b>
+<b>\u00B7${'\u00B8'.repeat(9)}\u00B9</b>
+&bul;Linear pitch : <O>pitch shift effects operate on linear pitch scale. The default and recommended setting for a new project</O>
+&bul;Amiga pitch : <O>pitch shift effects operate on Amiga period scale. Backwards compatible setting for MOD/S3M/XM/IT formats</O>
+&bul;Linear freq : <O>pitch shift effects operate on linear frequency scale. Backwards compatible setting for MONOTONE format</O>
+
+<b>&nbsp;INTERPOLATION</b>
+<b>\u00B7${'\u00B8'.repeat(13)}\u00B9</b>
+&bul;Default : <O>three-tap fast sinc interpolation. The default and recommended setting for a new project</O>
+&bul;None : <O>zeroth-order hold</O>
+&bul;A500 : <O>emulates what Paula chip of Amiga 500 does. <b>S 0x00</b> effects only work with this and Amiga 1200 mode</O>
+&bul;A1200 : <O>emulates what Paula chip of Amiga 1200 does</O>
+&bul;SNES : <O>four-tap gaussian interpolation used by SNES</O>
+&bul;DPCM : <O>simulates Differential Pulse Code Modulation used by NES</O>
+`
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+
+// assemble help text pieces to complete help message
+
+const HRULE = '\u00B4\u00B5'.repeat((_G.TAUT.HELPMSG_WIDTH) >>> 1) + '\n'
+
+// taut.js's popup uses (HELP_COL_TEXT on background) as the default colour pair.
+// The shared typesetter module owns the palette and the markup expander.
+function typeset(text) {
+    return ts.typeset(text, _G.TAUT.HELPMSG_WIDTH)
+}
+
+let helpMessages = [ // index: taut.js PANEL_NAMES
+    /* Timeline */[helpJam, helpTimeline, helpCommon, helpNotation].join(HRULE),
+    /* Cues */[helpCommon, helpNotation].join(HRULE), // placeholder
+    /* Patterns */[helpCommon, helpNotation].join(HRULE), // placeholder
+    /* Samples */[helpCommon, helpNotation].join(HRULE), // placeholder
+    /* Instruments */[helpCommon, helpNotation].join(HRULE), // placeholder
+    /* Project */[helpProjectFlags, helpCommon, helpNotation].join(HRULE), // placeholder
+    /* File */[helpCommon, helpNotation].join(HRULE), // placeholder
+]
+
+help.MSG_BY_TABS = helpMessages.map(it => typeset(it))
+help.typeset     = typeset
+help.COL_TEXT    = ts.COL_TEXT
+help.COL_EMPH    = ts.COL_EMPH
+
+if (!_G.TAUT.HELPMSG) _G.TAUT.HELPMSG=help;

assets/disk0/tvdos/bin/taut_instredit.js

@@ -0,0 +1,77 @@
+/**
+ * TAUT Instrument Editor
+ * Sub-program launched by taut.js when the Instrmnt tab is active.
+ * Rows 1-3 are owned by the parent; this program draws rows 4+.
+ *
+ * exec_args[1] = path to .taud file
+ * Sets _G.TAUT.UI.NEXTPANEL before returning to request a panel switch.
+ *
+ * Created by minjaesong on 2026-04-27
+ */
+
+const win = require("wintex")
+
+const PANEL_COUNT = 7
+const MY_PANEL   = 4 // VIEW_INSTRMNT
+
+const [SCRH, SCRW] = con.getmaxyx()
+const PANEL_Y = 4
+const PANEL_H = SCRH - PANEL_Y
+
+const colStatus  = 253
+const colContent = 240
+const colHdr     = 230
+
+function drawInstEditContents(wo) {
+    for (let y = PANEL_Y; y < SCRH; y++) {
+        con.move(y, 1)
+        con.color_pair(colContent, 255)
+        print(' '.repeat(SCRW))
+    }
+    con.move(PANEL_Y + 1, 3)
+    con.color_pair(colHdr, 255)
+    print('[ Instrument Editor ]')
+    con.move(PANEL_Y + 3, 3)
+    con.color_pair(colStatus, 255)
+    print('placeholder — not yet implemented')
+}
+
+function drawHints() {
+    con.move(SCRH, 1)
+    con.color_pair(colStatus, 255)
+    print(' '.repeat(SCRW - 1))
+    con.move(SCRH, 1)
+    con.color_pair(colHdr, 255); print('Tab ')
+    con.color_pair(colStatus, 255); print('Panel')
+}
+
+function instEditInput(wo, event) {
+    // placeholder — no interaction yet
+}
+
+const panel = new win.WindowObject(1, PANEL_Y, SCRW, PANEL_H, instEditInput, drawInstEditContents, undefined, ()=>{})
+
+panel.drawContents()
+drawHints()
+
+let done = false
+while (!done) {
+    input.withEvent(event => {
+        if (event[0] !== 'key_down') return
+        const keysym     = event[1]
+        const keyJustHit = (1 == event[2])
+        const shiftDown  = (event.includes(59) || event.includes(60))
+
+        if (!keyJustHit) return
+
+        if (keysym === '<TAB>') {
+            _G.TAUT.UI.NEXTPANEL = (MY_PANEL + (shiftDown ? -1 : 1) + PANEL_COUNT) % PANEL_COUNT
+            done = true
+            return
+        }
+
+        panel.processInput(event)
+    })
+}
+
+return 0

assets/disk0/tvdos/bin/taut_sampleedit.js

@@ -0,0 +1,77 @@
+/**
+ * TAUT Sample Editor
+ * Sub-program launched by taut.js when the Samples tab is active.
+ * Rows 1-3 are owned by the parent; this program draws rows 4+.
+ *
+ * exec_args[1] = path to .taud file
+ * Sets _G.TAUT.UI.NEXTPANEL before returning to request a panel switch.
+ *
+ * Created by minjaesong on 2026-04-27
+ */
+
+const win = require("wintex")
+
+const PANEL_COUNT = 7
+const MY_PANEL   = 3 // VIEW_SAMPLES
+
+const [SCRH, SCRW] = con.getmaxyx()
+const PANEL_Y = 4
+const PANEL_H = SCRH - PANEL_Y
+
+const colStatus  = 253
+const colContent = 240
+const colHdr     = 230
+
+function drawSampleEditContents(wo) {
+    for (let y = PANEL_Y; y < SCRH; y++) {
+        con.move(y, 1)
+        con.color_pair(colContent, 255)
+        print(' '.repeat(SCRW))
+    }
+    con.move(PANEL_Y + 1, 3)
+    con.color_pair(colHdr, 255)
+    print('[ Sample Editor ]')
+    con.move(PANEL_Y + 3, 3)
+    con.color_pair(colStatus, 255)
+    print('placeholder — not yet implemented')
+}
+
+function drawHints() {
+    con.move(SCRH, 1)
+    con.color_pair(colStatus, 255)
+    print(' '.repeat(SCRW - 1))
+    con.move(SCRH, 1)
+    con.color_pair(colHdr, 255); print('Tab ')
+    con.color_pair(colStatus, 255); print('Panel')
+}
+
+function sampleEditInput(wo, event) {
+    // placeholder — no interaction yet
+}
+
+const panel = new win.WindowObject(1, PANEL_Y, SCRW, PANEL_H, sampleEditInput, drawSampleEditContents, undefined, ()=>{})
+
+panel.drawContents()
+drawHints()
+
+let done = false
+while (!done) {
+    input.withEvent(event => {
+        if (event[0] !== 'key_down') return
+        const keysym     = event[1]
+        const keyJustHit = (1 == event[2])
+        const shiftDown  = (event.includes(59) || event.includes(60))
+
+        if (!keyJustHit) return
+
+        if (keysym === '<TAB>') {
+            _G.TAUT.UI.NEXTPANEL = (MY_PANEL + (shiftDown ? -1 : 1) + PANEL_COUNT) % PANEL_COUNT
+            done = true
+            return
+        }
+
+        panel.processInput(event)
+    })
+}
+
+return 0

assets/disk0/tvdos/bin/tautbtn.r8

@@ -0,0 +1 @@
+<EFBFBD><EFBFBD>洄洄洄洄洄泚<EFBFBD>泚<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>_<EFBFBD>_

assets/disk0/tvdos/bin/tautbtn0.r8

@@ -0,0 +1 @@
+<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>

assets/disk0/tvdos/bin/zfm.js

@@ -1,4 +1,6 @@
 const win = require("wintex")
+const keys = require("keysym")
+
 const COL_TEXT = 253
 const COL_BACK = 255
 const COL_BACK_SEL = 81
@@ -26,39 +28,96 @@ const COL_HL_EXT = {
     "wav": 31,
     "adpcm": 31,
     "pcm": 32,
-    "mp3": 33,
+//    "mp3": 33,
     "tad": 33,
     "mp2": 34,
     "mv1": 213,
     "mv2": 213,
     "mv3": 213,
     "tav": 213,
+    "ipf": 190,
     "ipf1": 190,
     "ipf2": 190,
+    "im3": 190,
+    "tap": 190,
     "txt": 223,
     "md": 223,
-    "log": 223
+    "log": 223,
+    "taud":109,
 }
 
 const EXEC_FUNS = {
     "wav": (f) => _G.shell.execute(`playwav "${f}" -i`),
     "adpcm": (f) => _G.shell.execute(`playwav "${f}" -i`),
-    "mp3": (f) => _G.shell.execute(`playmp3 "${f}" -i`),
+//    "mp3": (f) => _G.shell.execute(`playmp3 "${f}" -i`),
     "mp2": (f) => _G.shell.execute(`playmp2 "${f}" -i`),
     "mv1": (f) => _G.shell.execute(`playmv1 "${f}" -i`),
     "mv2": (f) => _G.shell.execute(`playtev "${f}" -i`),
     "mv3": (f) => _G.shell.execute(`playtav "${f}" -i`),
     "tav": (f) => _G.shell.execute(`playtav "${f}" -i`),
+    "im3": (f) => _G.shell.execute(`playtav "${f}" -i`),
+    "tap": (f) => _G.shell.execute(`playtav "${f}" -i`),
     "tad": (f) => _G.shell.execute(`playtad "${f}" -i`),
     "pcm": (f) => _G.shell.execute(`playpcm "${f}" -i`),
+    "ipf": (f) => _G.shell.execute(`decodeipf "${f}" -i`),
     "ipf1": (f) => _G.shell.execute(`decodeipf "${f}" -i`),
     "ipf2": (f) => _G.shell.execute(`decodeipf "${f}" -i`),
     "bas": (f) => _G.shell.execute(`basic "${f}"`),
     "txt": (f) => _G.shell.execute(`less "${f}"`),
     "md": (f) => _G.shell.execute(`less "${f}"`),
-    "log": (f) => _G.shell.execute(`less "${f}"`)
+    "log": (f) => _G.shell.execute(`less "${f}"`),
+    "taud": (f) => _G.shell.execute(`playtaud "${f}"`),
 }
 
+function makeExecFun(template) {
+    return (f) => _G.shell.execute(template.replaceAll("{0}", `"${f}"`))
+}
+
+function loadZfmrc() {
+    try {
+        let zfmrcPath = `A:${_TVDOS.variables.USERCONFIGPATH}\\zfmrc`
+        let zfmrcFile = files.open(zfmrcPath)
+        if (!zfmrcFile.exists) return
+
+        let content = zfmrcFile.sread()
+        let lines = content.split(/\r?\n/)
+        let currentSection = null
+
+        for (let i = 0; i < lines.length; i++) {
+            let line = lines[i].trim()
+            if (line.length === 0 || line.startsWith("#") || line.startsWith(";")) continue
+
+            if (line.startsWith("[") && line.endsWith("]")) {
+                currentSection = line.substring(1, line.length - 1).toUpperCase()
+                continue
+            }
+
+            if (currentSection === "EXEC_FUNS") {
+                let commaIdx = line.indexOf(",")
+                if (commaIdx < 0) continue
+                let ext = line.substring(0, commaIdx).trim().toLowerCase()
+                let template = line.substring(commaIdx + 1).trim()
+                if (ext.length === 0 || template.length === 0) continue
+                EXEC_FUNS[ext] = makeExecFun(template)
+            }
+            else if (currentSection === "COL_HL_EXT") {
+                let commaIdx = line.indexOf(",")
+                if (commaIdx < 0) continue
+                let ext = line.substring(0, commaIdx).trim().toLowerCase()
+                let colStr = line.substring(commaIdx + 1).trim()
+                if (ext.length === 0 || colStr.length === 0) continue
+                let col = parseInt(colStr, 10)
+                if (isNaN(col)) continue
+                COL_HL_EXT[ext] = col
+            }
+        }
+    } catch (e) {
+        serial.println("zfm: failed to load zfmrc: " + e.message)
+    }
+}
+
+loadZfmrc()
+
 let windowMode = 0 // 0 == left, 1 == right
 let windowFocus = [0] // is a stack; 0: files window, 1: palette window, 2: popup window
 
@@ -72,6 +131,7 @@ let cursor = [0, 0] // absolute position!
 
 function bytesToReadable(i) {
     return ''+ (
+       (i > 999999999999) ? (((i / 10000000000)|0)/100 + "T") :
        (i > 999999999) ? (((i / 10000000)|0)/100 + "G") :
        (i > 999999) ? (((i / 10000)|0)/100 + "M") :
        (i > 9999) ? (((i / 100)|0)/10 + "K") :
@@ -412,6 +472,8 @@ let filenavOninput = (window, event) => {
     let keycodes = [event[3],event[4],event[5],event[6],event[7],event[8],event[9],event[10]]
     let keycode = keycodes[0]
 
+    let scrollPeek = (LIST_HEIGHT / 3)|0
+
     if (keyJustHit && keysym == "q") {
         exit = true
     }
@@ -420,19 +482,19 @@ let filenavOninput = (window, event) => {
         redraw() // this would double-redraw (hence no panel switching) or something if redraw() is not merely a request to do so
     }
     else if (keysym == "<UP>") {
-        [cursor[windowMode], scroll[windowMode]] = win.scrollVert(-1, dirFileList[windowMode].length, LIST_HEIGHT, cursor[windowMode], scroll[windowMode], 1)
+        [cursor[windowMode], scroll[windowMode]] = win.scrollVert(-1, dirFileList[windowMode].length, LIST_HEIGHT, cursor[windowMode], scroll[windowMode], scrollPeek)
         drawFilePanel()
     }
     else if (keysym == "<DOWN>") {
-        [cursor[windowMode], scroll[windowMode]] = win.scrollVert(+1, dirFileList[windowMode].length, LIST_HEIGHT, cursor[windowMode], scroll[windowMode], 1)
+        [cursor[windowMode], scroll[windowMode]] = win.scrollVert(+1, dirFileList[windowMode].length, LIST_HEIGHT, cursor[windowMode], scroll[windowMode], scrollPeek)
         drawFilePanel()
     }
     else if (keysym == "<PAGE_UP>") {
-        [cursor[windowMode], scroll[windowMode]] = win.scrollVert(-LIST_HEIGHT, dirFileList[windowMode].length, LIST_HEIGHT, cursor[windowMode], scroll[windowMode], 1)
+        [cursor[windowMode], scroll[windowMode]] = win.scrollVert(-LIST_HEIGHT, dirFileList[windowMode].length, LIST_HEIGHT, cursor[windowMode], scroll[windowMode], scrollPeek)
         drawFilePanel()
     }
     else if (keysym == "<PAGE_DOWN>") {
-        [cursor[windowMode], scroll[windowMode]] = win.scrollVert(+LIST_HEIGHT, dirFileList[windowMode].length, LIST_HEIGHT, cursor[windowMode], scroll[windowMode], 1)
+        [cursor[windowMode], scroll[windowMode]] = win.scrollVert(+LIST_HEIGHT, dirFileList[windowMode].length, LIST_HEIGHT, cursor[windowMode], scroll[windowMode], scrollPeek)
         drawFilePanel()
     }
     else if (keyJustHit && keycode == 66) { // enter
@@ -665,11 +727,11 @@ while (!exit) {
         let keysym = event[1]
         let keyJustHit = (1 == event[2])
 
-        if (keyJustHit && event[3] != 66) { // release the latch right away if the key is not Return
+        if (keyJustHit && event[3] != keys.ENTER && keysym != "q") { // release the latch right away if the key is neither Return nor 'q'
             firstRunLatch = false
         }
 
-        if (keyJustHit && firstRunLatch) { // filter out the initial ENTER key as they would cause unwanted behaviours
+        if (keyJustHit && firstRunLatch) { // filter out the initial ENTER/'q' key as they would cause unwanted behaviours
             firstRunLatch = false
         }
         else {

assets/disk0/tvdos/hopper/getopt.hop.per

@@ -0,0 +1,11 @@
+HopperManifestVersion:1
+HopperPackageName:getopt
+HopperPackageVersion:1.0.0
+HopperPackageMaintainer:CuriousTorvald
+HopperProvides:getopt;
+HopperRequires:
+ProperName:getopt.js
+ProperAuthor:David Pacheco
+ProperDescription:node.js implementation of POSIX getopt() (and then some)
+Licence:MIT
+SystemPackagePath:/tvdos/include/getopt.mjs

assets/disk0/tvdos/hopper/libfs.hop.per

@@ -0,0 +1,12 @@
+HopperManifestVersion:1
+HopperPackageName:libfs
+HopperPackageVersion:1.0.0
+HopperPackageMaintainer:CuriousTorvald
+HopperProvides:libfs;
+HopperRequires:tvdos 1.*;
+ProperName:LibFS
+ProperAuthor:CuriousTorvald
+ProperDescription:NodeJS-compatible Filesystem module for TVDOS
+Licence:MIT
+SupportMe:https://github.com/sponsors/curioustorvald/
+SystemPackagePath:/tvdos/include/fs.mjs

assets/disk0/tvdos/hopper/libgl.hop.per

@@ -0,0 +1,12 @@
+HopperManifestVersion:1
+HopperPackageName:libgl
+HopperPackageVersion:1.0.0
+HopperPackageMaintainer:CuriousTorvald
+HopperProvides:libgl;
+HopperRequires:
+ProperName:LibGL
+ProperAuthor:CuriousTorvald
+ProperDescription:TVDOS Graphics Library
+Licence:MIT
+SupportMe:https://github.com/sponsors/curioustorvald/
+SystemPackagePath:/tvdos/include/gl.mjs

assets/disk0/tvdos/hopper/libpcm.hop.per

@@ -0,0 +1,12 @@
+HopperManifestVersion:1
+HopperPackageName:libpcm
+HopperPackageVersion:1.0.0
+HopperPackageMaintainer:CuriousTorvald
+HopperProvides:libpcm;
+HopperRequires:
+ProperName:LibPCM
+ProperAuthor:CuriousTorvald
+ProperDescription:PCM decoder for TSVM
+Licence:MIT
+SupportMe:https://github.com/sponsors/curioustorvald/
+SystemPackagePath:/tvdos/include/pcm.mjs

assets/disk0/tvdos/hopper/libpsg.hop.per

@@ -0,0 +1,12 @@
+HopperManifestVersion:1
+HopperPackageName:libpsg
+HopperPackageVersion:1.0.0
+HopperPackageMaintainer:CuriousTorvald
+HopperProvides:libpsg;
+HopperRequires:
+ProperName:LibPSG
+ProperAuthor:CuriousTorvald
+ProperDescription:Programmable sound generator library for TSVM
+Licence:MIT
+SupportMe:https://github.com/sponsors/curioustorvald/
+SystemPackagePath:/tvdos/include/psg.mjs

assets/disk0/tvdos/hopper/libseqread.hop.per

@@ -0,0 +1,12 @@
+HopperManifestVersion:1
+HopperPackageName:libseqread
+HopperPackageVersion:1.0.0
+HopperPackageMaintainer:CuriousTorvald
+HopperProvides:libseqread;
+HopperRequires:tvdos 1.*;
+ProperName:LibSeqread
+ProperAuthor:CuriousTorvald
+ProperDescription:Sequentially read files from disk drive
+Licence:MIT
+SupportMe:https://github.com/sponsors/curioustorvald/
+SystemPackagePath:/tvdos/include/seqread.mjs;/tvdos/include/seqreadtape.mjs

assets/disk0/tvdos/hopper/libtaud.hop.per

@@ -0,0 +1,12 @@
+HopperManifestVersion:1
+HopperPackageName:libtaud
+HopperPackageVersion:1.0.0
+HopperPackageMaintainer:CuriousTorvald
+HopperProvides:libtaud;
+HopperRequires:tvdos 1.*;
+ProperName:LibTaud
+ProperAuthor:CuriousTorvald
+ProperDescription:Helper functions for interaction between Taud format and TSVM Tracker
+Licence:MIT
+SupportMe:https://github.com/sponsors/curioustorvald/
+SystemPackagePath:/tvdos/include/taud.mjs

assets/disk0/tvdos/hopper/libterranbasic.hop.per

@@ -0,0 +1,12 @@
+HopperManifestVersion:1
+HopperPackageName:libterranbasic
+HopperPackageVersion:1.0.0
+HopperPackageMaintainer:CuriousTorvald
+HopperProvides:libterranbasic;
+HopperRequires:
+ProperName:LibTerranBasic
+ProperAuthor:CuriousTorvald
+ProperDescription:Terran BASIC runtime helper for compiled programs
+Licence:MIT
+SupportMe:https://github.com/sponsors/curioustorvald/
+SystemPackagePath:/tvdos/include/tbas.mjs

assets/disk0/tvdos/hopper/microtone.hop.per

@@ -0,0 +1,12 @@
+HopperManifestVersion:1
+HopperPackageName:microtone
+HopperPackageVersion:1.0.0
+HopperPackageMaintainer:CuriousTorvald
+HopperProvides:microtone;
+HopperRequires:tvdos 1.*;wintex 1.*;libtaud 1.*;libgl 1.*
+ProperName:Microtone
+ProperAuthor:CuriousTorvald
+ProperDescription:Microtonal tracker for TSVM
+Licence:MIT
+SupportMe:https://github.com/sponsors/curioustorvald/
+SystemPackagePath:/tvdos/bin/microtone.alias;/tvdos/bin/taut*

assets/disk0/tvdos/hopper/mirrors.list

@@ -0,0 +1,17 @@
+# Hopper Mirror List
+#
+# One mirror per non-empty, non-comment line.
+# Each entry is the remote URL prefix from which Hopper can fetch
+#     <prefix>mirror_manifest
+#     <prefix>filelist
+#     <prefix><package>.hop.per   (one per row of filelist)
+#
+# `mirror_manifest` declares HopperMirrorName, HopperMirrorMaintainer
+# and HopperMirrorRemotePrefix; `filelist` is CSV of
+#     packagename,version,hoppermanifest-filename
+#
+# Lines starting with `#` and empty lines are ignored.
+# A trailing slash on the prefix is optional; Hopper will add one
+# if missing.
+
+https://raw.githubusercontent.com/curioustorvald/hopper-mirror/refs/heads/master/

assets/disk0/tvdos/hopper/textedit.hop.per

@@ -0,0 +1,12 @@
+HopperManifestVersion:1
+HopperPackageName:textedit
+HopperPackageVersion:1.0.0
+HopperPackageMaintainer:CuriousTorvald
+HopperProvides:edit;
+HopperRequires:tvdos 1.*
+ProperName:edit.js
+ProperAuthor:CuriousTorvald
+ProperDescription:TVDOS default text editor
+Licence:MIT
+SupportMe:https://github.com/sponsors/curioustorvald/
+SystemPackagePath:/tvdos/bin/edit.js

assets/disk0/tvdos/hopper/tvdos.hop.per

@@ -0,0 +1,12 @@
+HopperManifestVersion:1
+HopperPackageName:tvdos
+HopperPackageVersion:1.0.0
+HopperPackageMaintainer:CuriousTorvald
+HopperProvides:tvdos;
+HopperRequires:
+ProperName:TVDOS
+ProperAuthor:CuriousTorvald
+ProperDescription:TSVM Disk Operating System
+Licence:MIT
+SupportMe:https://github.com/sponsors/curioustorvald/
+SystemPackagePath:/tvdos/TVDOS.SYS;/tvdos/hyve.SYS;/tvdos/HSDPADRV.SYS;/tvdos/bin/command.js;/tvdos/sbin/sysctl.js;/tvdos/include/font.mjs;/tvdos/include/keysym.mjs;/tvdos/include/mload.mjs;/tvdos/include/playgui.mjs;/tvdos/include/typesetter.mjs

assets/disk0/tvdos/hopper/wintex.hop.per

@@ -0,0 +1,12 @@
+HopperManifestVersion:1
+HopperPackageName:wintex
+HopperPackageVersion:1.0.0
+HopperPackageMaintainer:CuriousTorvald
+HopperProvides:wintex;
+HopperRequires:
+ProperName:WinTex
+ProperAuthor:CuriousTorvald
+ProperDescription:TUI window management and renderer
+Licence:MIT
+SupportMe:https://github.com/sponsors/curioustorvald/
+SystemPackagePath:/tvdos/include/wintex.mjs

assets/disk0/tvdos/hopper/zfm.hop.per

@@ -0,0 +1,12 @@
+HopperManifestVersion:1
+HopperPackageName:zfm
+HopperPackageVersion:1.0.0
+HopperPackageMaintainer:CuriousTorvald
+HopperProvides:zfm;
+HopperRequires:tvdos 1.*;wintex 1.*
+ProperName:ZFM
+ProperAuthor:CuriousTorvald
+ProperDescription:Z File Manager - Dual-panel file manager for TVDOS
+Licence:MIT
+SupportMe:https://github.com/sponsors/curioustorvald/
+SystemPackagePath:/tvdos/bin/zfm*

assets/disk0/tvdos/include/font.mjs

@@ -0,0 +1,31 @@
+function setHighRom(fullPath) {
+    const fontFile = files.open(fullPath)
+
+    // upload font
+    const fontData = fontFile.bread()
+    for (let i = 0; i < 1920; i++) sys.poke(-133121 - i, fontData[i])
+    sys.poke(-1299460, 19) // write to high rom
+
+    fontFile.close()
+}
+
+function setLowRom(fullPath) {
+    const fontFile = files.open(fullPath)
+
+    // upload font
+    const fontData = fontFile.bread()
+    for (let i = 0; i < 1920; i++) sys.poke(-133121 - i, fontData[i])
+    sys.poke(-1299460, 18) // write to low rom
+
+    fontFile.close()
+}
+
+function resetHighRom() {
+    sys.poke(-1299460, 21)
+}
+
+function resetLowRom() {
+    sys.poke(-1299460, 20)
+}
+
+exports = { setHighRom, setLowRom, resetHighRom, resetLowRom }

assets/disk0/tvdos/include/getopt.mjs

@@ -0,0 +1,305 @@
+/*
+ * getopt.js: node.js implementation of POSIX getopt() (and then some)
+ *
+ * Copyright 2011 David Pacheco. All rights reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+var ASSERT = require('assert').ok;
+
+function goError(msg)
+{
+	return (new Error('getopt: ' + msg));
+}
+
+/*
+ * The BasicParser is our primary interface to the outside world.  The
+ * documentation for this object and its public methods is contained in
+ * the included README.md.
+ */
+function goBasicParser(optstring, argv, optind)
+{
+	var ii;
+
+	ASSERT(optstring || optstring === '', 'optstring is required');
+	ASSERT(optstring.constructor === String, 'optstring must be a string');
+	ASSERT(argv, 'argv is required');
+	ASSERT(argv.constructor === Array, 'argv must be an array');
+
+	this.gop_argv = new Array(argv.length);
+	this.gop_options = {};
+	this.gop_aliases = {};
+	this.gop_optind = optind !== undefined ? optind : 2;
+	this.gop_subind = 0;
+
+	for (ii = 0; ii < argv.length; ii++) {
+		ASSERT(argv[ii].constructor === String,
+		    'argv must be string array');
+		this.gop_argv[ii] = argv[ii];
+	}
+
+	this.parseOptstr(optstring);
+}
+
+exports.BasicParser = goBasicParser;
+
+/*
+ * Parse the option string and update the following fields:
+ *
+ *	gop_silent	Whether to log errors to stderr.  Silent mode is
+ *			indicated by a leading ':' in the option string.
+ *
+ *	gop_options	Maps valid single-letter-options to booleans indicating
+ *			whether each option is required.
+ *
+ *	gop_aliases	Maps valid long options to the corresponding
+ *			single-letter short option.
+ */
+goBasicParser.prototype.parseOptstr = function (optstr)
+{
+	var chr, cp, alias, arg, ii;
+
+	ii = 0;
+	if (optstr.length > 0 && optstr[0] == ':') {
+		this.gop_silent = true;
+		ii++;
+	} else {
+		this.gop_silent = false;
+	}
+
+	while (ii < optstr.length) {
+		chr = optstr[ii];
+		arg = false;
+
+		if (!/^[\w\d\u1000-\u1100]$/.test(chr))
+			throw (goError('invalid optstring: only alphanumeric ' +
+			    'characters and unicode characters between ' +
+			    '\\u1000-\\u1100 may be used as options: ' + chr));
+
+		if (ii + 1 < optstr.length && optstr[ii + 1] == ':') {
+			arg = true;
+			ii++;
+		}
+
+		this.gop_options[chr] = arg;
+
+		while (ii + 1 < optstr.length && optstr[ii + 1] == '(') {
+			ii++;
+			cp = optstr.indexOf(')', ii + 1);
+			if (cp == -1)
+				throw (goError('invalid optstring: missing ' +
+				    '")" to match "(" at char ' + ii));
+
+			alias = optstr.substring(ii + 1, cp);
+			this.gop_aliases[alias] = chr;
+			ii = cp;
+		}
+
+		ii++;
+	}
+};
+
+goBasicParser.prototype.optind = function ()
+{
+	return (this.gop_optind);
+};
+
+/*
+ * For documentation on what getopt() does, see README.md.  The following
+ * implementation invariants are maintained by getopt() and its helper methods:
+ *
+ *	this.gop_optind		Refers to the element of gop_argv that contains
+ *				the next argument to be processed.  This may
+ *				exceed gop_argv, in which case the end of input
+ *				has been reached.
+ *
+ *	this.gop_subind		Refers to the character inside
+ *				this.gop_options[this.gop_optind] which begins
+ *				the next option to be processed.  This may never
+ *				exceed the length of gop_argv[gop_optind], so
+ *				when incrementing this value we must always
+ *				check if we should instead increment optind and
+ *				reset subind to 0.
+ *
+ * That is, when any of these functions is entered, the above indices' values
+ * are as described above.  getopt() itself and getoptArgument() may both be
+ * called at the end of the input, so they check whether optind exceeds
+ * argv.length.  getoptShort() and getoptLong() are called only when the indices
+ * already point to a valid short or long option, respectively.
+ *
+ * getopt() processes the next option as follows:
+ *
+ *	o If gop_optind > gop_argv.length, then we already parsed all arguments.
+ *
+ *	o If gop_subind == 0, then we're looking at the start of an argument:
+ *
+ *	    o Check for special cases like '-', '--', and non-option arguments.
+ *	      If present, update the indices and return the appropriate value.
+ *
+ *	    o Check for a long-form option (beginning with '--').  If present,
+ *	      delegate to getoptLong() and return the result.
+ *
+ *	    o Otherwise, advance subind past the argument's leading '-' and
+ *	      continue as though gop_subind != 0 (since that's now the case).
+ *
+ *	o Delegate to getoptShort() and return the result.
+ */
+goBasicParser.prototype.getopt = function ()
+{
+	if (this.gop_optind >= this.gop_argv.length)
+		/* end of input */
+		return (undefined);
+
+	var arg = this.gop_argv[this.gop_optind];
+
+	if (this.gop_subind === 0) {
+		if (arg == '-' || arg === '' || arg[0] != '-')
+			return (undefined);
+
+		if (arg == '--') {
+			this.gop_optind++;
+			this.gop_subind = 0;
+			return (undefined);
+		}
+
+		if (arg[1] == '-')
+			return (this.getoptLong());
+
+		this.gop_subind++;
+		ASSERT(this.gop_subind < arg.length);
+	}
+
+	return (this.getoptShort());
+};
+
+/*
+ * Implements getopt() for the case where optind/subind point to a short option.
+ */
+goBasicParser.prototype.getoptShort = function ()
+{
+	var arg, chr;
+
+	ASSERT(this.gop_optind < this.gop_argv.length);
+	arg = this.gop_argv[this.gop_optind];
+	ASSERT(this.gop_subind < arg.length);
+	chr = arg[this.gop_subind];
+
+	if (++this.gop_subind >= arg.length) {
+		this.gop_optind++;
+		this.gop_subind = 0;
+	}
+
+	if (!(chr in this.gop_options))
+		return (this.errInvalidOption(chr));
+
+	if (!this.gop_options[chr])
+		return ({ option: chr });
+
+	return (this.getoptArgument(chr));
+};
+
+/*
+ * Implements getopt() for the case where optind/subind point to a long option.
+ */
+goBasicParser.prototype.getoptLong = function ()
+{
+	var arg, alias, chr, eq;
+
+	ASSERT(this.gop_subind === 0);
+	ASSERT(this.gop_optind < this.gop_argv.length);
+	arg = this.gop_argv[this.gop_optind];
+	ASSERT(arg.length > 2 && arg[0] == '-' && arg[1] == '-');
+
+	eq = arg.indexOf('=');
+	alias = arg.substring(2, eq == -1 ? arg.length : eq);
+	if (!(alias in this.gop_aliases))
+		return (this.errInvalidOption(alias));
+
+	chr = this.gop_aliases[alias];
+	ASSERT(chr in this.gop_options);
+
+	if (!this.gop_options[chr]) {
+		if (eq != -1)
+			return (this.errExtraArg(alias));
+
+		this.gop_optind++; /* eat this argument */
+		return ({ option: chr });
+	}
+
+	/*
+	 * Advance optind/subind for the argument value and retrieve it.
+	 */
+	if (eq == -1)
+		this.gop_optind++;
+	else
+		this.gop_subind = eq + 1;
+
+	return (this.getoptArgument(chr));
+};
+
+/*
+ * For the given option letter 'chr' that takes an argument, assumes that
+ * optind/subind point to the argument (or denote the end of input) and return
+ * the appropriate getopt() return value for this option and argument (or return
+ * the appropriate error).
+ */
+goBasicParser.prototype.getoptArgument = function (chr)
+{
+	var arg;
+
+	if (this.gop_optind >= this.gop_argv.length)
+		return (this.errMissingArg(chr));
+
+	arg = this.gop_argv[this.gop_optind].substring(this.gop_subind);
+	this.gop_optind++;
+	this.gop_subind = 0;
+	return ({ option: chr, optarg: arg });
+};
+
+goBasicParser.prototype.errMissingArg = function (chr)
+{
+	if (this.gop_silent)
+		return ({ option: ':', optopt: chr });
+
+	process.stderr.write('option requires an argument -- ' + chr + '\n');
+	return ({ option: '?', optopt: chr, error: true });
+};
+
+goBasicParser.prototype.errInvalidOption = function (chr)
+{
+	if (!this.gop_silent)
+		process.stderr.write('illegal option -- ' + chr + '\n');
+
+	return ({ option: '?', optopt: chr, error: true });
+};
+
+/*
+ * This error is not specified by POSIX, but neither is the notion of specifying
+ * long option arguments using "=" in the same argv-argument, but it's common
+ * practice and pretty convenient.
+ */
+goBasicParser.prototype.errExtraArg = function (chr)
+{
+	if (!this.gop_silent)
+		process.stderr.write('option expects no argument -- ' +
+		    chr + '\n');
+
+	return ({ option: '?', optopt: chr, error: true });
+};

assets/disk0/tvdos/include/gl.mjs

@@ -1,7 +1,7 @@
-/*
+/**
-TVDOS Graphics Library
+ * LibGL — TVDOS Graphics Library
-
+ * Has no affiliation with OpenGL by Khronos Group
-Has no affiliation with OpenGL by Khronos Group
+ * @author CuriousTorvald
  */
 
 
@@ -45,7 +45,7 @@ exports.SpriteSheet = function(tilew, tileh, tex) {
         return ty;
     };
 };
-exports.drawTexPattern = function(texture, x, y, width, height, framebuffer, fgcol, bgcol) {
+exports.drawTexPattern = function(texture, x, y, width = texture.width, height = texture.height, framebuffer = false, fgcol, bgcol) {
     if (!(texture instanceof exports.Texture) && !(texture instanceof exports.MonoTex)) throw Error("Texture is not a GL Texture types");
 
     let paint = (!framebuffer) ? graphics.plotPixel : graphics.plotPixel2

assets/disk0/tvdos/include/keysym.mjs

@@ -0,0 +1,80 @@
+/**
+ * These are key symbols returned by `input.withEvent`, NOT `con.getch()`
+ */
+
+exports = {
+NUM_0:7,
+NUM_1:8,
+NUM_2:9,
+NUM_3:10,
+NUM_4:11,
+NUM_5:12,
+NUM_6:13,
+NUM_7:14,
+NUM_8:15,
+NUM_9:16,
+A:29,
+ALT_LEFT:57,
+ALT_RIGHT:58,
+APOSTROPHE:75,
+AT:77,
+B:30,
+BACK:4,
+BACKSLASH:73,
+C:31,
+CAPS_LOCK:115,
+COMMA:55,
+D:32,
+DEL:67,
+BACKSPACE:67,
+FORWARD_DEL:112,
+DOWN:20,
+LEFT:21,
+RIGHT:22,
+UP:19,
+E:33,
+ENTER:66,
+EQUALS:70,
+F:34,
+G:35,
+GRAVE:68,
+H:36,
+HOME:3,
+I:37,
+J:38,
+K:39,
+L:40,
+LEFT_BRACKET:71,
+M:41,
+MINUS:69,
+N:42,
+O:43,
+P:44,
+PERIOD:56,
+PLUS:81,
+Q:45,
+R:46,
+RIGHT_BRACKET:72,
+S:47,
+SEMICOLON:74,
+SHIFT_LEFT:59,
+SHIFT_RIGHT:60,
+SLASH:76,
+SPACE:62,
+SYM:63, // on MacOS, this is Command (⌘)
+T:48,
+TAB:61,
+U:49,
+V:50,
+W:51,
+X:52,
+Y:53,
+Z:54,
+CONTROL_LEFT:129,
+CONTROL_RIGHT:130,
+ESCAPE:111,
+END:123,
+INSERT:124,
+PAGE_UP:92,
+PAGE_DOWN:93,
+}

assets/disk0/tvdos/include/lfs.mjs

@@ -0,0 +1,171 @@
+/*
+ * lfs.mjs — programmatic extractor for TVDOS Linear File Strip archives.
+ *
+ *   let lfs = require("A:/tvdos/include/lfs.mjs")
+ *
+ *   // Pull one entry out:
+ *   let fd  = lfs.extractOne("A:/path/archive.lfs", "wanted.bin")
+ *   // → file descriptor for $:/TMP/<random>/wanted.bin
+ *
+ *   // Unpack the whole archive:
+ *   let dir = lfs.extractAll("A:/path/archive.lfs")
+ *   // → directory descriptor for $:/TMP/<random>/
+ *
+ * Both functions accept an `autoDecompress` boolean (default true). When
+ * a payload's first four bytes match the gzip (1F 8B 08 xx) or zstd
+ * (28 B5 2F FD) magic, the payload is inflated through gzip.decomp()
+ * before being written. The check is done on the payload bytes — the
+ * archived filename is irrelevant.
+ *
+ * Both functions require a relative-path archive (one produced by
+ * `lfs -c -r`); fully qualified archives carry drive letters that would
+ * not make sense rerooted under $:/TMP.
+ */
+
+const TMP_ROOT     = "$:/TMP"
+const HASH_ALPHABET = "YBNDRFG8EJKMCPQXOTLVWIS2A345H769"
+const HASH_LEN     = 32
+const LFS_HEADER   = "TVDOSLFS\x01"
+const LFS_HEADER_LEN = 16
+const LFS_FLAG_RELATIVE = 0x01
+
+
+function _makeHash(n) {
+    let s = ""
+    const m = HASH_ALPHABET.length
+    for (let i = 0; i < n; i++) s += HASH_ALPHABET[Math.floor(Math.random() * m)]
+    return s
+}
+
+function _isCompressed(s) {
+    if (s.length < 4) return false
+    const b0 = s.charCodeAt(0), b1 = s.charCodeAt(1)
+    const b2 = s.charCodeAt(2), b3 = s.charCodeAt(3)
+    if (b0 === 0x1f && b1 === 0x8b && b2 === 0x08) return true            // gzip
+    if (b0 === 0x28 && b1 === 0xb5 && b2 === 0x2f && b3 === 0xfd) return true  // zstd
+    return false
+}
+
+function _decompress(payload) {
+    // gzip.decomp transparently handles both gzip and zstd; returns Java byte[].
+    return btostr(gzip.decomp(payload))
+}
+
+function _readArchive(lfsPath) {
+    const fd = files.open(lfsPath)
+    if (!fd.exists)     throw new Error("LFS archive not found: " + lfsPath)
+    if (fd.isDirectory) throw new Error("LFS archive is a directory: " + lfsPath)
+
+    const bytes = fd.sread()
+    try { fd.close() } catch (_) {}
+
+    if (bytes.substring(0, LFS_HEADER.length) !== LFS_HEADER)
+        throw new Error("Not an LFS archive: " + lfsPath)
+
+    const flags = bytes.charCodeAt(11)
+    if ((flags & LFS_FLAG_RELATIVE) === 0)
+        throw new Error("LFS archive does not use relative paths: " + lfsPath)
+
+    return bytes
+}
+
+function _allocTmpDir() {
+    const path = TMP_ROOT + "/" + _makeHash(HASH_LEN)
+    const dir  = files.open(path)
+    dir.mkDir()
+    return { fd: dir, path: path }
+}
+
+function _normPath(p) {
+    return p.replace(/\//g, "\\")
+}
+
+function _writeFile(destDirPath, archivePath, payload) {
+    const parts = _normPath(archivePath).split("\\").filter(p => p.length > 0)
+    if (parts.length === 0) return null
+
+    const leaf = parts.pop()
+    let curPath = destDirPath
+    for (let i = 0; i < parts.length; i++) {
+        curPath = curPath + "/" + parts[i]
+        const cur = files.open(curPath)
+        if (!cur.exists) cur.mkDir()
+    }
+    const outfile = files.open(curPath + "/" + leaf)
+    if (!outfile.exists) outfile.mkFile()
+    outfile.swrite(payload)
+    return outfile
+}
+
+
+function extractOne(lfsPath, filename, autoDecompress) {
+    if (autoDecompress === undefined) autoDecompress = true
+    if (filename === undefined || filename === null || filename === "")
+        throw new Error("filename is required")
+
+    const bytes  = _readArchive(lfsPath)
+    const needle = _normPath(filename)
+
+    let curs = LFS_HEADER_LEN
+    while (curs < bytes.length) {
+        const fileType = bytes.charCodeAt(curs)
+        const pathlen  = (bytes.charCodeAt(curs+1) << 8) | bytes.charCodeAt(curs+2)
+        curs += 3
+        const path = bytes.substring(curs, curs + pathlen)
+        curs += pathlen
+        const filelen = (bytes.charCodeAt(curs) << 24)
+                      | (bytes.charCodeAt(curs+1) << 16)
+                      | (bytes.charCodeAt(curs+2) << 8)
+                      |  bytes.charCodeAt(curs+3)
+        curs += 4
+
+        if (_normPath(path) === needle) {
+            let payload = bytes.substring(curs, curs + filelen)
+            if (autoDecompress && _isCompressed(payload)) payload = _decompress(payload)
+
+            const dest  = _allocTmpDir()
+            const leaf  = needle.split("\\").pop()
+            const outfile = files.open(dest.path + "/" + leaf)
+            if (!outfile.exists) outfile.mkFile()
+            outfile.swrite(payload)
+            return outfile
+        }
+
+        curs += filelen
+    }
+
+    throw new Error("File not found in archive: " + filename)
+}
+
+
+function extractAll(lfsPath, autoDecompress) {
+    if (autoDecompress === undefined) autoDecompress = true
+
+    const bytes = _readArchive(lfsPath)
+    const dest  = _allocTmpDir()
+
+    let curs = LFS_HEADER_LEN
+    while (curs < bytes.length) {
+        const fileType = bytes.charCodeAt(curs)
+        const pathlen  = (bytes.charCodeAt(curs+1) << 8) | bytes.charCodeAt(curs+2)
+        curs += 3
+        const path = bytes.substring(curs, curs + pathlen)
+        curs += pathlen
+        const filelen = (bytes.charCodeAt(curs) << 24)
+                      | (bytes.charCodeAt(curs+1) << 16)
+                      | (bytes.charCodeAt(curs+2) << 8)
+                      |  bytes.charCodeAt(curs+3)
+        curs += 4
+
+        let payload = bytes.substring(curs, curs + filelen)
+        if (autoDecompress && _isCompressed(payload)) payload = _decompress(payload)
+        _writeFile(dest.path, path, payload)
+
+        curs += filelen
+    }
+
+    return dest.fd
+}
+
+
+exports = { extractOne, extractAll }

assets/disk0/tvdos/include/net.mjs

@@ -0,0 +1,123 @@
+/*
+ * net.mjs — Internet text-fetch helper for TVDOS
+ *
+ * Wraps the HttpModem peripheral (driven by `_TVDOS.DRV.FS.NET`, see
+ * TVDOS.SYS:1001-1034) behind a small, regular-URL-friendly API. The
+ * helper looks up whichever drive letter the boot probe assigned to the
+ * HTTP modem and translates ordinary URLs (`https://host/path`) into the
+ * scheme-without-double-slash form (`https:host/path`) that the modem
+ * expects on the wire.
+ *
+ * Usage
+ * -----
+ *     let net = require("A:/tvdos/include/net.mjs")
+ *
+ *     if (!net.isAvailable())
+ *         printerrln("No HTTP modem attached")
+ *
+ *     let body = net.fetchText("https://example.com/index.html")
+ *     if (body === null) printerrln("Fetch failed")
+ *     else println(body)
+ */
+
+
+let _cachedDrive = null
+
+/** Scan TVDOS drive table for an HTTP-typed device. Returns the drive
+ *  letter (e.g. "B") or null. */
+function _findHttpDrive() {
+    if (typeof _TVDOS === 'undefined' || !_TVDOS.DRIVEINFO) return null
+    if (_cachedDrive !== null && _TVDOS.DRIVEINFO[_cachedDrive] &&
+        _TVDOS.DRIVEINFO[_cachedDrive].type === 'HTTP')
+        return _cachedDrive
+
+    for (let letter in _TVDOS.DRIVEINFO) {
+        let info = _TVDOS.DRIVEINFO[letter]
+        if (info && info.type === 'HTTP') {
+            _cachedDrive = letter
+            return letter
+        }
+    }
+    return null
+}
+
+/** Convert a regular URL into the form the HTTP modem accepts:
+ *  - strip the `//` between scheme and authority
+ *  - drop any URL fragment
+ *  - assume `https` when no scheme is provided
+ */
+function _normaliseUrl(url) {
+    if (typeof url !== 'string')
+        throw new TypeError("url must be a string")
+    let s = url.trim()
+    if (s.length === 0) throw new Error("url is empty")
+
+    // Drop fragment — the modem speaks to the server, # is client-side.
+    let hash = s.indexOf('#')
+    if (hash >= 0) s = s.substring(0, hash)
+
+    // scheme://host/path  →  scheme:host/path
+    let m = s.match(/^([a-zA-Z][a-zA-Z0-9+.\-]*):\/\/(.*)$/)
+    if (m) return m[1].toLowerCase() + ':' + m[2]
+
+    // Already in scheme:host/path form (the modem's native shape)
+    if (/^[a-zA-Z][a-zA-Z0-9+.\-]*:[^/]/.test(s)) return s
+
+    // No scheme — default to https
+    if (!/^[a-zA-Z][a-zA-Z0-9+.\-]*:/.test(s))
+        return 'https:' + s.replace(/^\/\//, '')
+
+    return s
+}
+
+
+let net = {}
+
+/** Returns the drive letter currently bound to the HTTP modem, or null
+ *  when no such device is attached. */
+net.getHttpDrive = function () {
+    return _findHttpDrive()
+}
+
+/** True iff an HTTP modem is reachable through TVDOS. */
+net.isAvailable = function () {
+    return _findHttpDrive() !== null
+}
+
+/** Translate a URL into the `<drive>:\<modem-url>` form that
+ *  `files.open()` would route through `_TVDOS.DRV.FS.NET`. Useful when
+ *  another component wants the descriptor directly. Throws if no HTTP
+ *  modem is attached. */
+net.toModemPath = function (url) {
+    let drive = _findHttpDrive()
+    if (drive === null) throw new Error("No HTTP modem device is attached")
+    return drive + ':\\' + _normaliseUrl(url)
+}
+
+/** Open a TVDOS file descriptor backed by the HTTP modem for the given
+ *  URL. The descriptor's sread()/bread() trigger the actual fetch.
+ *  Throws if no HTTP modem is attached. */
+net.open = function (url) {
+    return files.open(net.toModemPath(url))
+}
+
+/** Fetch the body of `url` as a string. Returns the response text on
+ *  success, or null when the modem reports a non-zero status (bad URL,
+ *  I/O error, etc.). Throws if no HTTP modem is attached. */
+net.fetchText = function (url) {
+    let fd = net.open(url)
+    let text = fd.sread()
+    try { fd.close() } catch (_) {}
+    return (text === undefined) ? null : text
+}
+
+/** Like fetchText, but throws an Error instead of returning null on
+ *  fetch failure. */
+net.fetchTextOrThrow = function (url) {
+    let body = net.fetchText(url)
+    if (body === null) throw new Error("Failed to fetch URL: " + url)
+    return body
+}
+
+
+exports = net

assets/disk0/tvdos/include/pcm.mjs

@@ -1,3 +1,8 @@
+/**
+ * LibPCM — PCM decoder for TSVM
+ * @author CuriousTorvald
+ */
+
 const HW_SAMPLING_RATE = 32000
 function printdbg(s) { if (0) serial.println(s) }
 function printvis(s) { if (0) println(s) }
@@ -29,7 +34,7 @@ function s16Tou8(i) {
 }
 function u16Tos16(i) { return (i > 32767) ? i - 65536 : i }
 function randomRound(k) {
-    let rnd = (Math.random() + Math.random()) / 2.0 // this produces triangular distribution
+    let rnd = Math.random() // note to self: no triangular here
     return (rnd < (k - (k|0))) ? Math.ceil(k) : Math.floor(k)
 }
 function lerp(start, end, x) {

assets/disk0/tvdos/include/psg.mjs

@@ -0,0 +1,414 @@
+/**
+ * LibPSG — PSG emulator and mixer for TSVM
+ * Software-mixes various PSG channels and sends them to sound device as PCM
+ * @author CuriousTorvald
+ */
+
+const HW_SAMPLING_RATE = 32000
+
+function clamp(val, low, hi) { return (val < low) ? low : (val > hi) ? hi : val }
+function clampS16(i) { return clamp(i, -32768, 32767) }
+const uNybToSnyb = [0,1,2,3,4,5,6,7,-8,-7,-6,-5,-4,-3,-2,-1]
+// returns: [unsigned high, unsigned low, signed high, signed low]
+function getNybbles(b) { return [b >> 4, b & 15, uNybToSnyb[b >> 4], uNybToSnyb[b & 15]] }
+function s8Tou8(i) { return i + 128 }
+function s16Tou8(i) {
+//    return s8Tou8((i >> 8) & 255)
+    // apply dithering
+    let ufval = (i / 65536.0) + 0.5
+    let ival = randomRound(ufval * 255.0)
+    return ival|0
+}
+function u16Tos16(i) { return (i > 32767) ? i - 65536 : i }
+function randomRound(k) {
+    let rnd = Math.random() // note to self: no triangular here
+    return (rnd < (k - (k|0))) ? Math.ceil(k) : Math.floor(k)
+}
+function lerp(start, end, x) {
+    return (1 - x) * start + x * end
+}
+function lerpAndRound(start, end, x) {
+    return Math.round(lerp(start, end, x))
+}
+
+
+
+// output format: immediately uploadable into TSVM audio adapter
+
+// ── Internal helpers ────────────────────────────────────────────────────────
+
+function secToSamples(sec) { return Math.round(HW_SAMPLING_RATE * sec) }
+
+function isNative(buf) { return buf.native }
+
+function readU8(buf, ch, i) {
+    return isNative(buf) ? (sys.peek(buf[ch] + i) & 255) : buf[ch][i]
+}
+function writeU8(buf, ch, i, v) {
+    if (isNative(buf)) sys.poke(buf[ch] + i, v)
+    else buf[ch][i] = v
+}
+
+// ── Buffer management ───────────────────────────────────────────────────────
+
+function makeBuffer(length) {
+    // returns [Uint8Array, Uint8Array] (stereo) that will be used to collect samples made by LibPSG.
+    // Length: seconds. Number of elements: round(HW_SAMPLING_RATE * length)
+    const n = secToSamples(length)
+    const L = new Uint8Array(n)
+    const R = new Uint8Array(n)
+    L.fill(128)
+    R.fill(128)
+    return { 0: L, 1: R, samples: n, native: false }
+}
+
+function makeBufferNative(length) {
+    // returns native buffer object (stereo) that will be used to collect samples made by LibPSG.
+    // Length: seconds. Number of elements: round(HW_SAMPLING_RATE * length)
+    // Free with freeBufferNative() when done.
+    const n = secToSamples(length)
+    const L = sys.malloc(n); sys.memset(L, 128, n)
+    const R = sys.malloc(n); sys.memset(R, 128, n)
+    return { 0: L, 1: R, samples: n, native: true }
+}
+
+function freeBufferNative(buf) {
+    sys.free(buf[0])
+    sys.free(buf[1])
+}
+
+function clearBuffer(buf, offsetSec, lengthSec) {
+    // Re-silence a buffer region (fill with 128) for re-use across frames.
+    const start = (offsetSec != null) ? secToSamples(offsetSec) : 0
+    const total = (lengthSec != null) ? secToSamples(lengthSec) : (buf.samples - start)
+    if (!buf.native) {
+        buf[0].fill(128, start, start + total)
+        buf[1].fill(128, start, start + total)
+    } else {
+        sys.memset(buf[0] + start, 128, total)
+        sys.memset(buf[1] + start, 128, total)
+    }
+}
+
+// ── Shared mix core ─────────────────────────────────────────────────────────
+
+// sampleFn(i) must return a float in [-1, 1].
+// Mixing maths: decode u8 → s16, apply op, clamp, dither back to u8.
+function mixInto(buf, lengthSec, offsetSec, op, amp, pan, sampleFn) {
+    const startIdx = secToSamples(offsetSec)
+    const n = secToSamples(lengthSec)
+    // Linear pan law: centre (pan=0) → both channels at full amp
+    const gainL = Math.max(0, Math.min(1, 1.0 - pan))
+    const gainR = Math.max(0, Math.min(1, 1.0 + pan))
+    const opCode = (op === 'sub') ? 1 : (op === 'mul') ? 2 : 0  // default: add
+    for (let i = 0; i < n; i++) {
+        const v = sampleFn(i)           // oscillator value in [-1, 1]
+        const oscBase = v * amp * 32767
+        const oscL = Math.round(oscBase * gainL) | 0
+        const oscR = Math.round(oscBase * gainR) | 0
+        for (let ch = 0; ch < 2; ch++) {
+            const osc = (ch === 0) ? oscL : oscR
+            const cur = (readU8(buf, ch, startIdx + i) - 128) << 8
+            let out
+            switch (opCode) {
+                case 0: out = cur + osc; break
+                case 1: out = cur - osc; break
+                case 2: out = (cur * osc) >> 15; break
+            }
+            writeU8(buf, ch, startIdx + i, s16Tou8(clampS16(out)))
+        }
+    }
+}
+
+// ── Waveform generators ─────────────────────────────────────────────────────
+
+function makeSquare(buf, length, offset, freq, duty, op, amp, pan, phaseOffset) {
+    // buffer: [Uint8Array, Uint8Array] or native buffer
+    // length: in seconds
+    // offset: in seconds
+    // duty: 0.0 to 1.0. default 0.5 (fraction of period where output is +1)
+    // freq: Hz
+    // op: add / mul / sub; default: add
+    // amp: 0.0 to 1.0; default: 0.5
+    // pan: -1.0 to 1.0; default: 0.0
+    // phaseOffset: optional absolute-time base (seconds) added to phase calc only,
+    //              not to the buffer write position — use to ensure phase continuity
+    //              across successive calls (e.g. frame boundaries).
+    if (duty == null) duty = 0.5
+    if (op   == null) op   = 'add'
+    if (amp  == null) amp  = 0.5
+    if (pan  == null) pan  = 0.0
+    const tBase = (phaseOffset || 0) + offset
+    mixInto(buf, length, offset, op, amp, pan, function(i) {
+        const phase = ((tBase + i / HW_SAMPLING_RATE) * freq) % 1
+        return (phase < duty) ? 1.0 : -1.0
+    })
+}
+
+function makeTriangle(buf, length, offset, freq, duty, op, amp, pan, phaseOffset) {
+    // buffer: [Uint8Array, Uint8Array] or native buffer
+    // length: in seconds
+    // offset: in seconds
+    // duty: skew. -1.0 = falling sawtooth, 0.0 = symmetric triangle, 1.0 = rising sawtooth
+    // freq: Hz
+    // op: add / mul / sub; default: add
+    // amp: 0.0 to 1.0; default: 0.5
+    // pan: -1.0 to 1.0; default: 0.0
+    // phaseOffset: optional absolute-time base (seconds) added to phase calc only —
+    //              see makeSquare for details.
+    if (duty == null) duty = 0.0
+    if (op   == null) op   = 'add'
+    if (amp  == null) amp  = 0.5
+    if (pan  == null) pan  = 0.0
+    // riseFrac: fraction of period spent rising from -1 to +1
+    // 0.0 → falling saw, 0.5 → symmetric triangle, 1.0 → rising saw
+    const riseFrac = (duty + 1.0) * 0.5
+    const tBase = (phaseOffset || 0) + offset
+    mixInto(buf, length, offset, op, amp, pan, function(i) {
+        const phase = ((tBase + i / HW_SAMPLING_RATE) * freq) % 1
+        if (riseFrac <= 0) {
+            return 1.0 - 2.0 * phase                               // falling saw
+        } else if (riseFrac >= 1) {
+            return -1.0 + 2.0 * phase                              // rising saw
+        } else if (phase < riseFrac) {
+            return -1.0 + 2.0 * (phase / riseFrac)                 // rising slope
+        } else {
+            return 1.0 - 2.0 * ((phase - riseFrac) / (1.0 - riseFrac)) // falling slope
+        }
+    })
+}
+
+function makeAliasedTriangle(buf, length, offset, freq, duty, op, amp, pan, phaseOffset) {
+    // buffer: [Uint8Array, Uint8Array] or native buffer
+    // Famicom-style triangle — output is quantised to 16 DAC levels (4-bit, NES APU style).
+    // The staircase quantisation introduces harmonics that mimic NES character.
+    // length: in seconds
+    // offset: in seconds
+    // duty: skew. -1.0 = falling sawtooth, 0.0 = symmetric triangle, 1.0 = rising sawtooth
+    // freq: Hz
+    // op: add / mul / sub; default: add
+    // amp: 0.0 to 1.0; default: 0.5
+    // pan: -1.0 to 1.0; default: 0.0
+    // phaseOffset: optional absolute-time base (seconds) added to phase calc only —
+    //              see makeSquare for details.
+    if (duty == null) duty = 0.0
+    if (op   == null) op   = 'add'
+    if (amp  == null) amp  = 0.5
+    if (pan  == null) pan  = 0.0
+    const riseFrac = (duty + 1.0) * 0.5
+    const tBase = (phaseOffset || 0) + offset
+    mixInto(buf, length, offset, op, amp, pan, function(i) {
+        const phase = ((tBase + i / HW_SAMPLING_RATE) * freq) % 1
+        let v
+        if (riseFrac <= 0) {
+            v = 1.0 - 2.0 * phase
+        } else if (riseFrac >= 1) {
+            v = -1.0 + 2.0 * phase
+        } else if (phase < riseFrac) {
+            v = -1.0 + 2.0 * (phase / riseFrac)
+        } else {
+            v = 1.0 - 2.0 * ((phase - riseFrac) / (1.0 - riseFrac))
+        }
+        // Quantise to 16 levels (NES triangle 4-bit DAC: 0..15 → -1..+1)
+        const level = Math.max(0, Math.min(15, Math.round((v + 1.0) * 7.5)))
+        return level / 7.5 - 1.0
+    })
+}
+
+// ── LFSR helpers (for noise types 1 and 2) ─────────────────────────────────
+
+function lfsrStep(state, mode) {
+    // mode 0 (long/NES mode 0): feedback tap at bit 1; period 32767
+    // mode 1 (short/NES mode 1): feedback tap at bit 6; period 93 (metallic/tonal)
+    const bit0   = state & 1
+    const bitTap = (mode === 0) ? (state >> 1) & 1 : (state >> 6) & 1
+    const feed   = bit0 ^ bitTap
+    return ((feed << 14) | (state >> 1)) & 0x7FFF
+}
+
+function lfsrAdvance(state, steps, mode) {
+    for (let k = 0; k < steps; k++) state = lfsrStep(state, mode)
+    return state
+}
+
+// NES APU documented LFSR periods
+const LFSR_PERIOD_LONG  = 32767  // mode 0
+const LFSR_PERIOD_SHORT = 93     // mode 1
+
+function makeNoise(buf, length, offset, freq, type, op, amp, pan, phaseOffset) {
+    // buffer: [Uint8Array, Uint8Array] or native buffer
+    // length: in seconds
+    // offset: in seconds
+    // type:
+    //   -1: 8-bit white noise (random float per period, sample-and-hold)
+    //    0: 1-bit white noise (random ±1 per period, sample-and-hold)
+    //    1: 1-bit LFSR long mode  — NES mode 0, tap=bit0^bit1, period 32767 (full-spectrum)
+    //    2: 1-bit LFSR short mode — NES mode 1, tap=bit0^bit6, period 93 (metallic/tonal)
+    // freq: Hz (clock rate of the noise generator)
+    // op: add / mul / sub; default: add
+    // amp: 0.0 to 1.0; default: 0.5
+    // pan: -1.0 to 1.0; default: 0.0
+    // phaseOffset: optional absolute-time base (seconds) added to phase/LFSR calc only —
+    //              see makeSquare for details.
+    //
+    // LFSR types (1 and 2) are deterministic given (phaseOffset+offset, freq): calling
+    // with monotonically advancing phaseOffset+offset produces a seamless noise stream
+    // across frames. White noise types (-1, 0) are random per call.
+    if (op  == null) op  = 'add'
+    if (amp == null) amp = 0.5
+    if (pan == null) pan = 0.0
+    const tBase = (phaseOffset || 0) + offset
+
+    if (type === -1) {
+        // 8-bit white: new random float in [-1, 1] each clock period
+        let prevClock = -1
+        let noiseVal = 0.0
+        mixInto(buf, length, offset, op, amp, pan, function(i) {
+            const currentClock = Math.floor((tBase + i / HW_SAMPLING_RATE) * freq) | 0
+            if (currentClock !== prevClock) {
+                prevClock = currentClock
+                noiseVal = Math.random() * 2.0 - 1.0
+            }
+            return noiseVal
+        })
+    } else if (type === 0) {
+        // 1-bit white: random ±1 each clock period
+        let prevClock = -1
+        let noiseVal = 1.0
+        mixInto(buf, length, offset, op, amp, pan, function(i) {
+            const currentClock = Math.floor((tBase + i / HW_SAMPLING_RATE) * freq) | 0
+            if (currentClock !== prevClock) {
+                prevClock = currentClock
+                noiseVal = (Math.random() >= 0.5) ? 1.0 : -1.0
+            }
+            return noiseVal
+        })
+    } else {
+        // LFSR-based noise (types 1 and 2)
+        const mode   = (type === 2) ? 1 : 0
+        const period = (mode === 0) ? LFSR_PERIOD_LONG : LFSR_PERIOD_SHORT
+        // Advance to deterministic position for this tBase so consecutive frame
+        // calls with monotonically advancing phaseOffset produce a seamless noise stream.
+        const startClock = Math.floor(tBase * freq) | 0
+        let lfsr      = lfsrAdvance(1, startClock % period, mode)
+        let prevClock = startClock
+        mixInto(buf, length, offset, op, amp, pan, function(i) {
+            const currentClock = Math.floor((tBase + i / HW_SAMPLING_RATE) * freq) | 0
+            const delta = currentClock - prevClock
+            if (delta > 0) {
+                const steps = delta % period
+                if (steps > 0) lfsr = lfsrAdvance(lfsr, steps, mode)
+                prevClock = currentClock
+            }
+            return (lfsr & 1) ? 1.0 : -1.0
+        })
+    }
+}
+
+function makeAliasedTriangleNES(buf, length, offset, freq, duty, op, amp, pan, phaseOffset) {
+    // NES APU triangle — quantised to the authentic 32-step, 4-bit (0..15) staircase.
+    // The 32-step sequence is: 15,14,...,1,0, 0,1,...,14,15 (descending then ascending).
+    // This mirrors the real NES triangle DAC which has 32 equal-height steps per period.
+    // duty parameter is accepted for API symmetry but ignored (NES triangle is always symmetric).
+    // phaseOffset: optional absolute-time base (seconds) — see makeSquare for details.
+    if (op  == null) op  = 'add'
+    if (amp == null) amp = 0.5
+    if (pan == null) pan = 0.0
+    const tBase = (phaseOffset || 0) + offset
+    mixInto(buf, length, offset, op, amp, pan, function(i) {
+        const phase = ((tBase + i / HW_SAMPLING_RATE) * freq) % 1
+        const step32 = Math.floor(phase * 32) | 0  // 0..31
+        // step 0..15: descend from 15 to 0; step 16..31: ascend from 0 to 15
+        const level = (step32 < 16) ? (15 - step32) : (step32 - 16)
+        return level / 7.5 - 1.0  // map 0..15 → -1..+1
+    })
+}
+
+// ── Send to audio hardware ──────────────────────────────────────────────────
+
+function sendBuffer(buf, playhead, offsetSec, lengthSec, stagingPtr) {
+    // Interleaves the L and R channels into a staging region (LRLRLR…) and uploads
+    // to the audio adapter pcmBin via the standard putPcmDataByPtr pipeline.
+    //
+    // offsetSec:  start of region to send (default: 0)
+    // lengthSec:  duration to send (default: entire buffer from offsetSec)
+    // stagingPtr: optional caller-owned native buffer (≥ min(chunk, 32768) * 2 bytes).
+    //             Pass a pre-allocated pointer to avoid malloc/free per call —
+    //             useful for the per-frame tvnes pattern.
+    //
+    // The function auto-chunks at 32768 stereo samples (pcmBin capacity).
+    // Blocks briefly if the audio queue is saturated (queue depth > 2).
+    const start = (offsetSec != null) ? secToSamples(offsetSec) : 0
+    const total = (lengthSec != null) ? secToSamples(lengthSec) : (buf.samples - start)
+    const MAX_CHUNK = 32768  // pcmBin = 65536 bytes; stereo → max 32768 samples per upload
+    const ownsStaging = (stagingPtr == null)
+    if (ownsStaging) stagingPtr = sys.malloc(Math.min(total, MAX_CHUNK) * 2)
+
+    let remaining = total
+    let cursor    = start
+    while (remaining > 0) {
+        const take = Math.min(remaining, MAX_CHUNK)
+        // Interleave L, R into staging buffer
+        for (let i = 0; i < take; i++) {
+            sys.poke(stagingPtr + 2 * i,     readU8(buf, 0, cursor + i))
+            sys.poke(stagingPtr + 2 * i + 1, readU8(buf, 1, cursor + i))
+        }
+        // Wait for room in the playback queue (mirrors playwav.js idiom)
+        // while (audio.getPosition(playhead) > 2) sys.sleep(2)
+        audio.putPcmDataByPtr(playhead, stagingPtr, take * 2, 0)
+        audio.setSampleUploadLength(playhead, take * 2)
+        audio.startSampleUpload(playhead)
+        remaining -= take
+        cursor    += take
+    }
+
+    if (ownsStaging) sys.free(stagingPtr)
+}
+
+// Lazily-allocated JS-side interleave scratch; shared across sendBufferFast calls.
+let _sendFastScratch = null
+
+function sendBufferFast(buf, playhead, offsetSec, lengthSec, stagingPtr) {
+    // Like sendBuffer but interleaves L/R via a JS Uint8Array + one sys.pokeBytes per chunk,
+    // instead of ~2n sys.poke calls.  Requires a non-native (JS-backed) buffer.
+    // Falls back to sendBuffer for native buffers.
+    if (isNative(buf)) { sendBuffer(buf, playhead, offsetSec, lengthSec, stagingPtr); return }
+
+    const start = (offsetSec != null) ? secToSamples(offsetSec) : 0
+    const total = (lengthSec != null) ? secToSamples(lengthSec) : (buf.samples - start)
+    const MAX_CHUNK = 32768
+    const ownsStaging = (stagingPtr == null)
+    if (ownsStaging) stagingPtr = sys.malloc(Math.min(total, MAX_CHUNK) * 2)
+
+    const scratchNeeded = Math.min(total, MAX_CHUNK) * 2
+    if (_sendFastScratch == null || _sendFastScratch.length < scratchNeeded) {
+        _sendFastScratch = new Uint8Array(scratchNeeded)
+    }
+
+    let remaining = total
+    let cursor    = start
+    while (remaining > 0) {
+        const take = Math.min(remaining, MAX_CHUNK)
+        const L = buf[0], R = buf[1], sc = _sendFastScratch
+        for (let i = 0; i < take; i++) {
+            sc[2 * i]     = L[cursor + i]
+            sc[2 * i + 1] = R[cursor + i]
+        }
+        sys.pokeBytes(stagingPtr, sc.subarray(0, take * 2), take * 2)
+        // while (audio.getPosition(playhead) > 2) sys.sleep(2)
+        audio.putPcmDataByPtr(playhead, stagingPtr, take * 2, 0)
+        audio.setSampleUploadLength(playhead, take * 2)
+        audio.startSampleUpload(playhead)
+        remaining -= take
+        cursor    += take
+    }
+
+    if (ownsStaging) sys.free(stagingPtr)
+}
+
+exports = {
+    HW_SAMPLING_RATE,
+    makeBuffer, makeBufferNative, freeBufferNative, clearBuffer,
+    makeSquare, makeTriangle, makeAliasedTriangle, makeAliasedTriangleNES, makeNoise,
+    sendBuffer, sendBufferFast
+}

assets/disk0/tvdos/include/seqread.mjs

@@ -1,4 +1,7 @@
-
+/**
+ * LibSeqread — sequentially read files from disk drive
+ * @author CuriousTorvald
+ */
 let readCount = 0
 let port = undefined
 let fileHeader = new Uint8Array(4096)

assets/disk0/tvdos/include/seqreadtape.mjs

@@ -1,3 +1,8 @@
+/**
+ * LibSeqread extension for Tape Drive — sequentially read tape
+ * @author CuriousTorvald
+ */
+
 // Sequential reader for HSDPA TAPE devices
 // Unlike seqread.mjs which is limited to 4096 bytes per read due to serial communication,
 // this module can read larger chunks efficiently from HSDPA devices.

assets/disk0/tvdos/include/taud.mjs

@@ -0,0 +1,321 @@
+/*
+ * LibTaud — Helper functions for interaction between Taud format and TSVM Tracker
+ * Requires TVDOS to function.
+ * @author CuriousTorvald
+ */
+
+// ── Format constants ────────────────────────────────────────────────────────
+
+const TAUD_MAGIC        = [0x1F,0x54,0x53,0x56,0x4D,0x61,0x75,0x64]  // \x1F TSVMaud
+const TAUD_VERSION      = 1
+const TAUD_HEADER_SIZE  = 32     // magic(8) + version(1) + numSongs(1) + compSize(4) + projOff(4) + sig(14)
+const TAUD_SONG_ENTRY   = 32     // see encodeSongEntry / decodeSongEntry below
+// Sample+instrument image: 8 MB sample pool (banked, 16 × 512 K) + 64 K instrument bin = 8256 kB total.
+// (terranmon.txt:1985-1997, 2533-2564 — bank-switched via MMIO 46.)
+const SAMPLE_BANK_SIZE  = 524288             // 512 K — size of the sample-bin window
+const SAMPLE_BANK_COUNT = 16                 // 16 banks × 512 K = 8 MB
+const SAMPLEBIN_SIZE    = SAMPLE_BANK_SIZE * SAMPLE_BANK_COUNT   // 8 MB
+const INSTBIN_SIZE      = 65536              // 256 inst × 256 bytes
+const SAMPLEINST_SIZE   = SAMPLEBIN_SIZE + INSTBIN_SIZE          // 8454144 = 8256 kB
+const SAMPLEBIN_WINDOW_OFFSET = 0            // peripheral memory window for the active sample bank
+const INSTBIN_WINDOW_OFFSET   = 720896       // peripheral memory offset of instrument bin
+const PATTERN_SIZE      = 512    // bytes per pattern (64 rows × 8 bytes)
+const NUM_PATTERNS_MAX  = 256
+const NUM_CUES          = 1024
+const CUE_SIZE          = 32     // bytes per cue entry (packed 12-bit×20 voices + instruction + pad)
+
+// Signature written into the file (14 bytes, space-padded)
+const CAPTURE_SIGNATURE = "LibTaud/TSVM  "
+
+// ── Internal helpers ────────────────────────────────────────────────────────
+
+function _peekU32LE(ptr, off) {
+    return ((sys.peek(ptr+off)   & 0xFF)       ) |
+           ((sys.peek(ptr+off+1) & 0xFF) <<  8 ) |
+           ((sys.peek(ptr+off+2) & 0xFF) << 16 ) |
+           ((sys.peek(ptr+off+3) & 0xFF) * 0x1000000)  // avoid sign-extend
+}
+
+function _pokeU32LE(ptr, off, v) {
+    sys.poke(ptr+off,   (v        ) & 0xFF)
+    sys.poke(ptr+off+1, (v >>>  8) & 0xFF)
+    sys.poke(ptr+off+2, (v >>> 16) & 0xFF)
+    sys.poke(ptr+off+3, (v >>> 24) & 0xFF)
+}
+
+// ── uploadTaudFile ──────────────────────────────────────────────────────────
+
+/**
+ * Load one song from a Taud file into the tracker hardware and configure the
+ * given playhead ready to play.
+ *
+ * @param inFile             Full path with drive letter, e.g. "A:/music/song.taud"
+ * @param songIndex          0-based index of the song in the SONG TABLE
+ * @param playhead Playhead number (0-3) to configure
+ */
+function uploadTaudFile(inFile, songIndex, playhead) {
+    const drive    = inFile[0].toUpperCase()
+    const diskPath = inFile.substring(2)
+
+    const memBase  = audio.getMemAddr()
+
+    // -- 1. Read whole file into VM memory ------------------------------------
+    const fileHandle = files.open(inFile)
+
+    if (!fileHandle.exists) {
+        throw Error("taud: file not exists")
+    }
+
+    const fileSize = fileHandle.size
+    const filePtr  = sys.malloc(fileSize)
+    fileHandle.pread(filePtr, fileSize, 0)
+
+    let pos = 0
+
+    // -- 2. Verify magic ------------------------------------------------------
+    for (let i = 0; i < 8; i++) {
+        let magicc = sys.peek(filePtr + i)
+        if (magicc !== TAUD_MAGIC[i]) {
+            sys.free(filePtr)
+            throw Error("taud: bad magic byte " + magicc.toString(16) + " at index " + i)
+        }
+    }
+    pos = 8
+
+    // -- 3. Parse header ------------------------------------------------------
+    // version(1) + numSongs(1) + compressedSize(4) + rsvd(2) + signature(16) = 24 bytes
+    let version        = sys.peek(filePtr + pos) & 0xFF;  pos++
+    let numSongs       = sys.peek(filePtr + pos) & 0xFF;  pos++
+    let compressedSize = _peekU32LE(filePtr, pos);         pos += 4
+    pos += 18  // skip reserved(2) + signature(16)
+    // pos == 32 == TAUD_HEADER_SIZE
+
+    if (songIndex < 0 || songIndex >= numSongs) {
+        sys.free(filePtr)
+        throw Error("taud: songIndex " + songIndex + " out of range (numSongs=" + numSongs + ")")
+    }
+
+    // -- 4. Decompress and upload sample+instrument bin -----------------------
+    // The decompressed image is 8256 kB (8 MB samples bank-major + 64 K instruments)
+    // which exceeds the 8 MB user-space cap, so we route through a hardware helper
+    // that decompresses straight into the adapter's native sample/instrument
+    // storage instead of staging a buffer in user memory.
+    audio.uploadSampleInstBlob(filePtr + pos, compressedSize)
+    audio.setSampleBank(0)
+    pos += compressedSize
+
+    // -- 5. Parse song-table entry for the requested song --------------------
+    let entryOff   = pos + songIndex * TAUD_SONG_ENTRY
+    let songOffset = _peekU32LE(filePtr, entryOff)
+    let numVoices  = sys.peek(filePtr + entryOff + 4) & 0xFF
+    let numPatsLo  = sys.peek(filePtr + entryOff + 5) & 0xFF
+    let numPatsHi  = sys.peek(filePtr + entryOff + 6) & 0xFF
+    let bpmStored  = sys.peek(filePtr + entryOff + 7) & 0xFF
+    let tickRate   = sys.peek(filePtr + entryOff + 8) & 0xFF
+    let mixerflags = sys.peek(filePtr + entryOff + 15) & 0xFF
+    let songGlobalVolume = sys.peek(filePtr + entryOff + 16) & 0xFF
+    let songMixingVolume = sys.peek(filePtr + entryOff + 17) & 0xFF
+    let patBinCompSize   = _peekU32LE(filePtr, entryOff + 18)
+    let cueSheetCompSize = _peekU32LE(filePtr, entryOff + 22)
+
+    let bpm        = bpmStored + 25
+    let patsToLoad = numPatsLo | (numPatsHi << 8)
+
+    // -- 6. Decompress + upload patterns --------------------------------------
+    let patBinSize  = patsToLoad * PATTERN_SIZE
+    let patBinPtr   = sys.malloc(patBinSize)
+    gzip.decompFromTo(filePtr + songOffset, patBinCompSize, patBinPtr)
+
+    let patBytes = new Array(PATTERN_SIZE)
+    for (let p = 0; p < patsToLoad; p++) {
+        for (let k = 0; k < PATTERN_SIZE; k++)
+            patBytes[k] = sys.peek(patBinPtr + p * PATTERN_SIZE + k) & 0xFF
+        audio.uploadPattern(p, patBytes)
+    }
+    sys.free(patBinPtr)
+
+    // -- 7. Decompress + upload cue sheet -------------------------------------
+    let cueSheetSize = NUM_CUES * CUE_SIZE
+    let cueSheetPtr  = sys.malloc(cueSheetSize)
+    gzip.decompFromTo(filePtr + songOffset + patBinCompSize, cueSheetCompSize, cueSheetPtr)
+
+    let cueBytes = new Array(CUE_SIZE)
+    for (let c = 0; c < NUM_CUES; c++) {
+        for (let k = 0; k < CUE_SIZE; k++)
+            cueBytes[k] = sys.peek(cueSheetPtr + c * CUE_SIZE + k) & 0xFF
+        audio.uploadCue(c, cueBytes)
+    }
+    sys.free(cueSheetPtr)
+
+    // -- 8. Configure playhead ------------------------------------------------
+    audio.setTrackerMode(playhead)
+    audio.setBPM(playhead, bpm)
+    audio.setTickRate(playhead, tickRate > 0 ? tickRate : 6)
+    audio.setTrackerMixerFlags(playhead, mixerflags)
+    audio.setSongGlobalVolume(playhead, songGlobalVolume)
+    audio.setSongMixingVolume(playhead, songMixingVolume)
+
+
+    fileHandle.close()
+    sys.free(filePtr)
+}
+
+// ── captureTrackerDataToFile ────────────────────────────────────────────────
+
+/**
+ * Dump the current tracker hardware state (sample bin, instruments, patterns
+ * in bank 0, cue sheet) to a single-song Taud file.  BPM and tick-rate are
+ * taken from playhead 0.
+ *
+ * @param outFile Full path with drive letter, e.g. "A:/music/out.taud"
+ */
+function captureTrackerDataToFile(outFile) {
+    const drive    = outFile[0].toUpperCase()
+    const diskPath = outFile.substring(2)
+
+    const memBase  = audio.getMemAddr()
+    const baseAddr = audio.getBaseAddr()
+
+    // -- 1. Compress sample+instrument bin ------------------------------------
+    // The 8256 kB raw image (8 MB samples + 64 K instruments) cannot fit in the
+    // 8 MB user space, so we hand the entire compress step to a hardware helper
+    // that reads directly out of the adapter's native sample/instrument storage.
+    // Realistic sample data compresses well under both gzip and zstd; we cap the
+    // destination at "uncompressed size + 8 K" headroom which suffices for any
+    // sane musical content.
+    const COMP_BUF_CAP = 1024 * 1024 * 4   // 4 MiB cap for compressed sample+inst blob
+    let compBuf       = sys.malloc(COMP_BUF_CAP)
+    let compressedSize = audio.captureSampleInstBlob(compBuf, COMP_BUF_CAP)
+    if (compressedSize > COMP_BUF_CAP) {
+        sys.free(compBuf)
+        throw Error("taud: compressed sample+inst blob exceeded " + COMP_BUF_CAP + " bytes (got " + compressedSize + ")")
+    }
+
+    // -- 2. Find last non-empty pattern in bank 0 (all-zero = uninitialized) --
+    let numPatsActual = 0
+    outer: for (let p = NUM_PATTERNS_MAX - 1; p >= 0; p--) {
+        let patBase = 131072 + p * PATTERN_SIZE  // offset within peripheral memory space
+        for (let k = 0; k < PATTERN_SIZE; k++) {
+            if ((sys.peek(memBase - (patBase + k)) & 0xFF) !== 0) {
+                numPatsActual = p + 1
+                break outer
+            }
+        }
+    }
+    if (numPatsActual === 0) numPatsActual = 1  // always emit at least one pattern slot
+
+    let numPats    = numPatsActual  // Uint16, 1-65535
+    let patsToSave = numPatsActual
+
+    // -- 3. BPM / tick-rate / volumes from playhead 0 -------------------------
+    let bpm      = audio.getBPM(0)      || 125
+    let tickRate = audio.getTickRate(0) || 6
+    let bpmStored = (bpm - 25) & 0xFF
+    let songGlobalVolume = audio.getSongGlobalVolume(0)
+    let songMixingVolume = audio.getSongMixingVolume(0)
+    if (songGlobalVolume === undefined || songGlobalVolume === null) songGlobalVolume = 0x80
+    if (songMixingVolume === undefined || songMixingVolume === null) songMixingVolume = 0x80
+
+    // -- 4. Compress pattern bin ----------------------------------------------
+    let patBinSize = patsToSave * PATTERN_SIZE
+    let patBuf     = sys.malloc(patBinSize)
+    sys.memcpy(memBase - 131072, patBuf, patBinSize)
+
+    let patCompBuf = sys.malloc(patBinSize + 4096)
+    let patCompSize = gzip.compFromTo(patBuf, patBinSize, patCompBuf)
+    sys.free(patBuf)
+
+    // -- 5. Compress cue sheet ------------------------------------------------
+    // Cue entry c, byte k is at MMIO address 32768 + c*32 + k,
+    // accessed as sys.peek(baseAddr − (32768 + c*32 + k)).
+    let cueSheetSize = NUM_CUES * CUE_SIZE
+    let cueBuf = sys.malloc(cueSheetSize)
+    for (let c = 0; c < NUM_CUES; c++) {
+        let cueOff = 32768 + c * CUE_SIZE
+        for (let k = 0; k < CUE_SIZE; k++)
+            sys.poke(cueBuf + c * CUE_SIZE + k,
+                sys.peek(baseAddr - (cueOff + k)) & 0xFF)
+    }
+
+    let cueCompBuf  = sys.malloc(cueSheetSize + 4096)
+    let cueCompSize = gzip.compFromTo(cueBuf, cueSheetSize, cueCompBuf)
+    sys.free(cueBuf)
+
+    // -- 6. Compute song offset (absolute from file start) --------------------
+    // Layout: header(32) + compressed(compressedSize) + songTable(1 × TAUD_SONG_ENTRY)
+    let songOffset = TAUD_HEADER_SIZE + compressedSize + 1 * TAUD_SONG_ENTRY
+
+    // -- 7. Build header byte array (32 bytes) --------------------------------
+    let sigBytes = new Array(14)
+    for (let i = 0; i < 14; i++)
+        sigBytes[i] = i < CAPTURE_SIGNATURE.length ? CAPTURE_SIGNATURE.charCodeAt(i) : 0
+
+    let header = [
+        // Magic (8)
+        0x1F, 0x54, 0x53, 0x56, 0x4D, 0x61, 0x75, 0x64,
+        // version, numSongs
+        TAUD_VERSION, 1,
+        // compressedSize uint32 LE (4) -- sample+inst bin
+        (compressedSize        ) & 0xFF,
+        (compressedSize >>>  8) & 0xFF,
+        (compressedSize >>> 16) & 0xFF,
+        (compressedSize >>> 24) & 0xFF,
+        // project data offset (4) -- not emitted
+        0x00, 0x00, 0x00, 0x00,
+    ].concat(sigBytes)  // 8 + 2 + 4 + 4 + 14 = 32 bytes
+
+    // -- 8. Build song-table row (32 bytes) -----------------------------------
+    let songTable = [
+        (songOffset        ) & 0xFF,
+        (songOffset >>>  8) & 0xFF,
+        (songOffset >>> 16) & 0xFF,
+        (songOffset >>> 24) & 0xFF,
+        20,                                    // numVoices
+        numPats & 0xFF, (numPats >>> 8) & 0xFF, // numPatterns Uint16 LE
+        bpmStored,                             // BPM with −25 bias
+        tickRate,                              // initial tick-rate
+        0x00,0xA0,                             // basenote (0xA000 -- C9)
+        0x00,0xAC,0x02,0x46,                   // basefreq (8363 Hz)
+        sys.peek(baseAddr - 7),                // mixer flags
+        songGlobalVolume & 0xFF,               // global volume
+        songMixingVolume & 0xFF,               // mixing volume
+        // pattern bin compressed size (4)
+        (patCompSize        ) & 0xFF,
+        (patCompSize >>>  8) & 0xFF,
+        (patCompSize >>> 16) & 0xFF,
+        (patCompSize >>> 24) & 0xFF,
+        // cue sheet compressed size (4)
+        (cueCompSize        ) & 0xFF,
+        (cueCompSize >>>  8) & 0xFF,
+        (cueCompSize >>> 16) & 0xFF,
+        (cueCompSize >>> 24) & 0xFF,
+        // reserved (6)
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+    ]
+
+    // -- 9. Write header (creates / truncates file) ---------------------------
+    const fileHandle = files.open(outFile)
+    fileHandle.bwrite(header)
+
+    // -- 10. Append compressed sample+inst bin --------------------------------
+    fileHandle.pwrite(compBuf, compressedSize, TAUD_HEADER_SIZE)
+    sys.free(compBuf)
+
+    // -- 11. Write song table -------------------------------------------------
+    fileHandle.bwrite(songTable)
+
+    // -- 12. Append compressed pattern bin ------------------------------------
+    fileHandle.pwrite(patCompBuf, patCompSize,
+        TAUD_HEADER_SIZE + compressedSize + songTable.length)
+    sys.free(patCompBuf)
+
+    // -- 13. Append compressed cue sheet --------------------------------------
+    fileHandle.pwrite(cueCompBuf, cueCompSize,
+        TAUD_HEADER_SIZE + compressedSize + songTable.length + patCompSize)
+    sys.free(cueCompBuf)
+
+
+    fileHandle.flush(); fileHandle.close()
+}
+
+exports = { uploadTaudFile, captureTrackerDataToFile }

assets/disk0/tvdos/include/tbas.mjs

@@ -0,0 +1,621 @@
+// Terran BASIC runtime helper for compiled programs
+// Compiled-by: assets/disk0/tbas/compile.js
+// Loaded at runtime by `let bS = require("tbas")`
+//
+// Contract with compiler:
+//   - The compiler has lowered every BASIC expression to a JS expression
+//     that produces the *raw* JS value (number, string, array, ForGen,
+//     function, BasicMemoMonad, …). Builtins take such raw values, NOT
+//     SyntaxTreeReturnObj wrappers.
+//   - Variable reads: bS.__state.vars.X    (key always uppercased)
+//   - Variable writes: bS.__state.vars.X = v
+//   - Control flow (GOTO/GOSUB/RETURN/FOR/NEXT/IF/ON/END/READ/RESTORE/LABEL/DATA)
+//     is *not* exposed here — the compiler emits inline JS that updates the
+//     `pc` and `gosubStack` directly.
+//
+// Naming: BASIC builtins exposed under their UPPERCASE name (bS.PRINT,
+// bS.PLOT, bS.SIN). Compiler-only helpers prefixed with __.
+
+// ---------------------------------------------------------------------------
+// Types & helpers
+// ---------------------------------------------------------------------------
+
+function isNumable(s) {
+    if (Array.isArray(s)) return false
+    if (s === undefined) return false
+    if (typeof s.trim == "function" && s.trim().length == 0) return false
+    return !isNaN(s)
+}
+const tonum = (t) => t * 1.0
+
+function ForGen(s, e, t) {
+    this.start = s
+    this.end = e
+    this.step = t || 1
+    this.current = this.start
+    this.stepsgn = (this.step > 0) ? 1 : -1
+}
+const isGenerator = (o) =>
+    o !== undefined && o !== null &&
+    o.start !== undefined && o.end !== undefined &&
+    o.step !== undefined && o.stepsgn !== undefined
+const genToArray = (gen) => {
+    let a = []
+    let cur = gen.start
+    while (cur * gen.stepsgn + gen.step * gen.stepsgn <= (gen.end + gen.step) * gen.stepsgn) {
+        a.push(cur)
+        cur += gen.step
+    }
+    return a
+}
+const genHasNext = (o) => o.current * o.stepsgn + o.step * o.stepsgn <= (o.end + o.step) * o.stepsgn
+const genGetNext = (gen, mutated) => {
+    if (mutated !== undefined) gen.current = tonum(mutated)
+    gen.current += gen.step
+    return genHasNext(gen) ? gen.current : undefined
+}
+
+function BasicMemoMonad(m) { this.mType = "value"; this.mVal = m }
+function BasicListMonad(m) { this.mType = "list";  this.mVal = [m] }
+function BasicFunSeq(f)    { this.mType = "funseq"; this.mVal = f }
+const isMonad = (o) => o !== undefined && o !== null && o.mType !== undefined
+
+function arrayToString(a) {
+    let acc = ""
+    for (let k = 0; k < a.length; k++) {
+        if (k > 0) acc += ","
+        acc += (Array.isArray(a[k])) ? arrayToString(a[k]) : a[k]
+    }
+    return "{" + acc + "}"
+}
+
+// ---------------------------------------------------------------------------
+// State container
+// ---------------------------------------------------------------------------
+
+const _initialConsts = () => ({
+    NIL: [],
+    PI: Math.PI,
+    TAU: Math.PI * 2,
+    EULER: Math.E,
+    UNDEFINED: undefined,
+    TRUE: true,
+    FALSE: false,
+    // ID is identity-function: emitted as JS arrow when needed
+    ID: (x) => x,
+})
+
+const state = {
+    vars: _initialConsts(),
+    indexBase: 0,
+    dataConsts: [],
+    dataCursor: 0,
+    gotoLabels: {},   // labelName -> [lnum, stmt]
+    lineList: [],     // sorted ascending list of existing source lines (for GOTO snap)
+    rnd: Math.random(),
+    forVar: {},       // varname -> generator|array (the iterable we still owe to FOR/FOREACH)
+    forLnums: {},     // varname -> [lnum, stmt of the FOR/FOREACH header]
+    forStack: [],
+    trace: false,
+    debug: false,
+}
+
+function __reset() {
+    state.vars = _initialConsts()
+    state.indexBase = 0
+    state.dataConsts = []
+    state.dataCursor = 0
+    state.gotoLabels = {}
+    state.lineList = []
+    state.rnd = Math.random()
+    state.forVar = {}
+    state.forLnums = {}
+    state.forStack = []
+}
+
+function __data(values)  { state.dataConsts = values.slice() }
+function __labels(map)   { state.gotoLabels = Object.assign({}, map) }
+function __setLines(arr) { state.lineList = arr.slice() }
+
+// ---------------------------------------------------------------------------
+// Compiler-emitted operator helpers (need behaviour not directly expressible
+// in raw JS without losing semantics)
+// ---------------------------------------------------------------------------
+
+function __add(lh, rh) {
+    return (!isNaN(lh) && !isNaN(rh)) ? (tonum(lh) + tonum(rh)) : (lh + rh)
+}
+function __div(lh, rh)    { if (rh == 0) throw Error("Division by zero"); return lh / rh }
+function __intdiv(lh, rh) { if (rh == 0) throw Error("Division by zero"); return (lh / rh) | 0 }
+function __mod(lh, rh)    { if (rh == 0) throw Error("Division by zero"); return lh % rh }
+function __pow(lh, rh) {
+    let r = Math.pow(lh, rh)
+    if (isNaN(r)) throw Error("Illegal function call")
+    if (!isFinite(r)) throw Error("Division by zero")
+    return r
+}
+
+function __test(v) { return !!v }   // matches builtin TEST: string "false" is truthy
+
+function __dim(dims) {
+    let revdims = dims.slice().reverse()
+    let inner = new Array(revdims[0]).fill(0)
+    for (let k = 1; k < revdims.length; k++) {
+        const sz = revdims[k]
+        const prev = inner
+        inner = new Array(sz).fill(0).map(_ => JSON.parse(JSON.stringify(prev)))
+    }
+    return inner
+}
+
+function __subscriptError(idx, dim) {
+    return Error("Subscript out of range (index " + idx + ", dim " + dim + ")")
+}
+function __arrGet(arr, idx) {
+    let v = arr
+    for (let i = 0; i < idx.length; i++) {
+        if (v === undefined || v === null) throw __subscriptError(idx[i], i)
+        v = v[idx[i] - state.indexBase]
+    }
+    return v
+}
+function __arrSet(arr, idx, value) {
+    let v = arr
+    for (let i = 0; i < idx.length - 1; i++) {
+        if (v === undefined || v === null) throw __subscriptError(idx[i], i)
+        v = v[idx[i] - state.indexBase]
+    }
+    if (v === undefined || v === null) throw __subscriptError(idx[idx.length - 1], idx.length - 1)
+    v[idx[idx.length - 1] - state.indexBase] = value
+}
+
+// FOR / FOREACH setup. Lowered as:
+//   __forSetup(varname, iterable, bodyLnum, bodyStmt)
+// where iterable is a ForGen (FOR…TO…STEP) OR an Array (FOREACH IN…), and
+// (bodyLnum, bodyStmt) is the PC of the statement immediately following the
+// FOR header — i.e. where NEXT should jump back to. The compiler supplies
+// this directly so the state machine doesn't rely on fall-through.
+function __forSetup(varname, iterable, bodyLnum, bodyStmt) {
+    const v = varname.toUpperCase()
+    if (isGenerator(iterable)) {
+        state.vars[v] = iterable.start
+        state.forVar[v] = iterable
+    } else if (Array.isArray(iterable)) {
+        state.vars[v] = iterable[0]
+        state.forVar[v] = iterable.slice(1)  // remainder
+    } else {
+        throw Error("FOR: not a generator or array")
+    }
+    state.forLnums[v] = [bodyLnum, bodyStmt]
+    state.forStack.push(v)
+}
+
+// NEXT [varname]. Without varname, pops the most recent.
+// Returns [lnum, stmt] to jump back to (just-after the FOR header) if more
+// iterations remain, or undefined if the loop is exhausted (caller falls
+// through).
+function __forNext(varname) {
+    let v
+    if (varname === undefined || varname === null) {
+        v = state.forStack.pop()
+    } else {
+        v = varname.toUpperCase()
+        // remove this varname from the stack
+        const idx = state.forStack.lastIndexOf(v)
+        if (idx >= 0) state.forStack.splice(idx, 1)
+    }
+    if (v === undefined) throw Error("NEXT without FOR")
+
+    const it = state.forVar[v]
+    let nextVal
+    if (isGenerator(it)) {
+        nextVal = genGetNext(it, state.vars[v])
+    } else {
+        nextVal = it.shift()
+    }
+
+    if (nextVal !== undefined) {
+        state.vars[v] = nextVal
+        state.forStack.push(v)
+        return state.forLnums[v]   // already the PC of the loop body
+    } else {
+        if (isGenerator(it)) state.vars[v] = it.current
+        return undefined
+    }
+}
+
+function __readData() {
+    const r = state.dataConsts[state.dataCursor++]
+    if (r === undefined) throw Error("Out of DATA")
+    return r
+}
+
+// Resolve a GOTO/GOSUB target — accepts numeric line, label string, or
+// already-evaluated expression. For numeric targets that don't match an
+// existing source line, snap upward to the next one (matches the
+// interpreter's behaviour, where the main loop simply increments lnum until
+// it finds a populated cmdbuf entry).
+function __resolveTarget(t) {
+    if (typeof t === "string" && state.gotoLabels[t] !== undefined) {
+        return state.gotoLabels[t]
+    }
+    let target
+    if (typeof t === "number")    target = t
+    else if (isNumable(t))        target = tonum(t)
+    else throw Error("Invalid jump target: " + t)
+
+    const lines = state.lineList
+    if (lines.length === 0) return [target, 0]
+    // linear scan is fine for the line counts BASIC programs reach
+    for (let i = 0; i < lines.length; i++) {
+        if (lines[i] >= target) return [lines[i], 0]
+    }
+    return [Infinity, 0]
+}
+
+// Invoke a usrdefun (compiled to a JS function), or — when the parser
+// couldn't tell array-indexing apart from function-call (e.g. `A(5)` for an
+// unknown identifier) — index into an array. Used by MAP/FOLD/FILTER, monad
+// operators, and the compiler's default `function` lowering.
+function __runFn(fn, args) {
+    if (typeof fn === "function") return fn.apply(null, args)
+    if (Array.isArray(fn)) return __arrGet(fn, args)
+    if (isMonad(fn) && fn.mType === "funseq") {
+        let arg = args[0]
+        for (let i = 0; i < fn.mVal.length; i++) arg = __runFn(fn.mVal[i], [arg])
+        return arg
+    }
+    throw Error("Not a callable: " + fn)
+}
+
+// ---------------------------------------------------------------------------
+// Operator builtins (where JS doesn't already do the right thing)
+// ---------------------------------------------------------------------------
+
+function _AND(a, b) { if (typeof a !== "boolean" || typeof b !== "boolean") throw Error("Type mismatch"); return a && b }
+function _OR (a, b) { if (typeof a !== "boolean" || typeof b !== "boolean") throw Error("Type mismatch"); return a || b }
+function _NOT(a)    { return !a }
+
+function _CONS(lh, rh) {  // !
+    if (Array.isArray(rh)) return [lh].concat(rh)
+    if (rh && rh.mType === "list") { rh.mVal = [lh].concat(rh.mVal); return rh }
+    throw Error("Type mismatch")
+}
+function _PUSH(lh, rh) {  // ~
+    if (Array.isArray(lh)) return lh.concat([rh])
+    if (lh && lh.mType === "list") { lh.mVal = [lh.mVal].concat([rh]); return lh }
+    throw Error("Type mismatch")
+}
+function _CONCAT(lh, rh) {  // #
+    if (Array.isArray(lh) && Array.isArray(rh)) return lh.concat(rh)
+    if (lh && rh && lh.mType === "list" && rh.mType === "list") return new BasicListMonad(lh.mVal.concat(rh.mVal))
+    throw Error("Type mismatch")
+}
+
+function _TO(from, to)        { return new ForGen(from, to, 1) }
+function _STEP(gen, step) {
+    if (!isGenerator(gen)) throw Error("Type mismatch (STEP)")
+    return new ForGen(gen.start, gen.end, step)
+}
+
+// ---------------------------------------------------------------------------
+// I/O builtins
+// ---------------------------------------------------------------------------
+
+// PRINT(values, seps) — values: array of resolved JS values; seps: array of
+// length values.length-1 with "," | ";" between each consecutive pair.
+// Trailing semicolon? The compiler signals "no newline" by passing a final
+// `null` element in `values` and "noNewline" flag — we use the convention
+// that the LAST entry of `values` being a marker `__noNewline` suppresses
+// the newline (matches basic.js trailing-null behaviour).
+const __PRINT_NONL = Symbol("PRINT_NONL")
+function PRINT(values, seps) {
+    seps = seps || []
+    if (values.length === 0) {
+        println()
+        return
+    }
+    let suppressNewline = false
+    let realLen = values.length
+    if (values[realLen - 1] === __PRINT_NONL) {
+        suppressNewline = true
+        realLen -= 1
+    }
+    for (let i = 0; i < realLen; i++) {
+        if (i >= 1 && seps[i - 1] === ",") print("\t")
+        const v = values[i]
+        let s
+        if (Array.isArray(v))            s = arrayToString(v)
+        else if (v === undefined || v === "") s = ""
+        else if (v.toString !== undefined)    s = v.toString()
+        else                                  s = v
+        print(s)
+    }
+    if (!suppressNewline) println()
+}
+function EMIT(values, seps) {
+    seps = seps || []
+    if (values.length === 0) { println(); return }
+    let suppressNewline = false
+    let realLen = values.length
+    if (values[realLen - 1] === __PRINT_NONL) { suppressNewline = true; realLen -= 1 }
+    for (let i = 0; i < realLen; i++) {
+        if (i >= 1 && seps[i - 1] === ",") print("\t")
+        const v = values[i]
+        if (v === undefined) print("")
+        else if (isNumable(v)) {
+            const c = con.getyx()
+            con.addch(tonum(v))
+            con.move(c[0], c[1] + 1)
+        } else if (v.toString !== undefined) print(v.toString())
+        else print(v)
+    }
+    if (!suppressNewline) println()
+}
+
+function INPUT(promptOrVarname) {
+    print("? ")
+    let r = sys.read().trim()
+    if (!isNaN(r)) r = tonum(r)
+    return r
+}
+function CIN() { return sys.read().trim() }
+
+// ---------------------------------------------------------------------------
+// Numeric builtins
+// ---------------------------------------------------------------------------
+
+const _num = (f) => (x) => { if (!isNumable(x)) throw Error("Type mismatch"); return f(tonum(x)) }
+const _num2 = (f) => (a, b) => {
+    if (!isNumable(a) || !isNumable(b)) throw Error("Type mismatch")
+    return f(tonum(a), tonum(b))
+}
+
+const ABS   = _num(Math.abs)
+const SGN   = _num(x => x > 0 ? 1 : x < 0 ? -1 : 0)
+const INT   = _num(Math.floor)
+const FLOOR = _num(Math.floor)
+const CEIL  = _num(Math.ceil)
+const FIX   = _num(x => x | 0)
+const ROUND = _num(Math.round)
+const SQR   = _num(Math.sqrt)
+const CBR   = _num(Math.cbrt)
+const SIN   = _num(Math.sin)
+const COS   = _num(Math.cos)
+const TAN   = _num(Math.tan)
+const ASN   = _num(Math.asin)
+const ACO   = _num(Math.acos)
+const ATN   = _num(Math.atan)
+const SINH  = _num(Math.sinh)
+const COSH  = _num(Math.cosh)
+const TANH  = _num(Math.tanh)
+const EXP   = _num(Math.exp)
+const LOG   = _num(Math.log)
+const MIN   = _num2((a,b) => a > b ? b : a)
+const MAX   = _num2((a,b) => a < b ? b : a)
+
+function RND(x) {
+    // matches basic.js:1199 — only re-roll when arg !== 0
+    if (!(x === 0)) state.rnd = Math.random()
+    return state.rnd
+}
+
+// ---------------------------------------------------------------------------
+// String builtins
+// ---------------------------------------------------------------------------
+
+function SPC(n)  { return " ".repeat(n) }
+function LEFT(s, n)         { return String(s).substring(0, n) }
+function RIGHT(s, n)        { return String(s).substring(String(s).length - n) }
+function MID(s, start, len) { return String(s).substring(start - state.indexBase, start - state.indexBase + len) }
+function CHR(n)  { return String.fromCharCode(n) }
+
+// ---------------------------------------------------------------------------
+// List builtins
+// ---------------------------------------------------------------------------
+
+function LEN(x)  { if (x === undefined || x.length === undefined) throw Error("Type mismatch"); return x.length }
+function HEAD(x) { if (!x || x.length < 1) throw Error("Type mismatch"); return x[0] }
+function TAIL(x) { if (!x || x.length < 1) throw Error("Type mismatch"); return x.slice(1) }
+function INIT(x) { if (!x || x.length < 1) throw Error("Type mismatch"); return x.slice(0, x.length - 1) }
+function LAST(x) { if (!x || x.length < 1) throw Error("Type mismatch"); return x[x.length - 1] }
+
+function MAP(fn, functor) {
+    if (typeof fn !== "function" && !(isMonad(fn) && fn.mType === "funseq")) throw Error("MAP: not a function")
+    if (isGenerator(functor)) functor = genToArray(functor)
+    if (!Array.isArray(functor)) throw Error("MAP: not iterable")
+    return functor.map(it => __runFn(fn, [it]))
+}
+function FOLD(fn, init, functor) {
+    if (typeof fn !== "function" && !(isMonad(fn) && fn.mType === "funseq")) throw Error("FOLD: not a function")
+    if (isGenerator(functor)) functor = genToArray(functor)
+    if (!Array.isArray(functor)) throw Error("FOLD: not iterable")
+    let akku = init
+    for (let i = 0; i < functor.length; i++) akku = __runFn(fn, [akku, functor[i]])
+    return akku
+}
+function FILTER(fn, functor) {
+    if (typeof fn !== "function" && !(isMonad(fn) && fn.mType === "funseq")) throw Error("FILTER: not a function")
+    if (isGenerator(functor)) functor = genToArray(functor)
+    if (!Array.isArray(functor)) throw Error("FILTER: not iterable")
+    return functor.filter(it => __runFn(fn, [it]))
+}
+
+// Array literal constructor — emitted by the compiler for `[a,b,c]` syntax
+function ARRAY() { return Array.prototype.slice.call(arguments) }
+
+// ---------------------------------------------------------------------------
+// Graphics / system
+// ---------------------------------------------------------------------------
+
+function CLS()   { con.clear() }
+function CLPX()  { graphics.clearPixels(255) }
+function PLOT(x, y, c) { graphics.plotPixel(x, y, c) }
+function GOTOYX(y, x)  { con.move(y + (1 - state.indexBase), x + (1 - state.indexBase)) }
+function TEXTFORE(c)   { print(String.fromCharCode(27, 91) + "38;5;" + (c | 0) + "m") }
+function TEXTBACK(c)   { print(String.fromCharCode(27, 91) + "48;5;" + (c | 0) + "m") }
+function POKE(addr, v) { sys.poke(addr, v) }
+function PEEK(addr)    { return sys.peek(addr) }
+function GETKEYSDOWN() {
+    const keys = []
+    sys.poke(-40, 255)
+    for (let k = -41; k >= -48; k--) keys.push(sys.peek(k))
+    return keys
+}
+
+function CPUT(devnum, msg) { com.sendMessage(devnum, msg); return com.getStatusCode(devnum) }
+function CGET(devnum, ptr) {
+    const msg = com.pullMessage(devnum)
+    const len = msg.length | 0
+    for (let i = 0; i < len; i++) sys.poke(ptr + i, msg.charCodeAt(i))
+    return len
+}
+function CSTA(devnum) { return com.getStatusCode(devnum) }
+
+// ---------------------------------------------------------------------------
+// Type / debug
+// ---------------------------------------------------------------------------
+
+function TYPEOF(v) {
+    if (v === undefined) return "null"
+    if (typeof v === "boolean") return "bool"
+    if (Array.isArray(v)) return "array"
+    if (isGenerator(v)) return "generator"
+    if (isMonad(v)) return v.mType + "-monad"
+    if (typeof v === "function") return "usrdefun"
+    if (isNumable(v)) return "num"
+    if (typeof v === "string") return "string"
+    return typeof v
+}
+
+function OPTIONBASE(n) {
+    if (n != 0 && n != 1) throw Error("Syntax error: OPTIONBASE")
+    state.indexBase = n | 0
+}
+function OPTIONDEBUG(n) { state.debug = (n | 0) === 1 }
+function OPTIONTRACE(n) { state.trace = (n | 0) === 1 }
+
+// ---------------------------------------------------------------------------
+// Monad / functional ops (best-effort port)
+// ---------------------------------------------------------------------------
+
+function MRET(v)  { return new BasicMemoMonad(v) }
+function MLIST(v) { return new BasicListMonad(v) }
+function MJOIN(m) { if (!isMonad(m)) throw Error("Type mismatch"); return m.mVal }
+
+function _BIND(ma, fn) {     // >>=
+    if (!isMonad(ma)) throw Error(">>=: left is not a monad")
+    if (typeof fn !== "function") throw Error(">>=: right is not a function")
+    const mb = __runFn(fn, [ma.mVal])
+    if (!isMonad(mb)) throw Error(">>=: function did not return a monad")
+    return mb
+}
+function _SEQ(ma, mb) {      // >>~
+    if (!isMonad(ma) || !isMonad(mb)) throw Error("Type mismatch")
+    return mb
+}
+function _COMPOSE(fa, fb) {  // .
+    const ma = (typeof fa === "function") ? [fa] : fa.mVal
+    const mb = (typeof fb === "function") ? [fb] : fb.mVal
+    return new BasicFunSeq(mb.concat(ma))
+}
+function _APPLY(fn, value) {  // $
+    return __runFn(fn, [value])
+}
+function _PIPE(value, fn) {   // &
+    return _APPLY(fn, value)
+}
+function _CURRY(fn, value) {  // ~<
+    if (typeof fn !== "function") throw Error("~<: left is not a function")
+    return function() {
+        const rest = Array.prototype.slice.call(arguments)
+        return fn.apply(null, [value].concat(rest))
+    }
+}
+function _SEQAPP(fns, functor) {  // <*>
+    if (!Array.isArray(fns)) throw Error("<*>: first arg must be an array of functions")
+    if (isGenerator(functor)) functor = genToArray(functor)
+    if (!Array.isArray(functor)) throw Error("<*>: not iterable")
+    let ret = []
+    for (let i = 0; i < fns.length; i++) ret = ret.concat(functor.map(it => __runFn(fns[i], [it])))
+    return ret
+}
+function _SEQCURRYMAP(fns, functor) {  // <~>
+    if (typeof fns === "function") fns = [fns]
+    if (!Array.isArray(fns)) throw Error("<~>: first arg must be a function or array of functions")
+    if (isGenerator(functor)) functor = genToArray(functor)
+    if (!Array.isArray(functor)) throw Error("<~>: not iterable")
+    let ret = []
+    for (let i = 0; i < fns.length; i++) ret = ret.concat(functor.map(it => _CURRY(fns[i], it)))
+    return ret
+}
+
+// ---------------------------------------------------------------------------
+// Exports
+// ---------------------------------------------------------------------------
+
+exports = {
+    // state & introspection
+    __state: state, __reset, __data, __labels, __setLines,
+    __PRINT_NONL,
+
+    // operator helpers
+    __add, __div, __intdiv, __mod, __pow, __test,
+    __dim, __arrGet, __arrSet,
+    __forSetup, __forNext, __readData, __resolveTarget,
+    __runFn,
+
+    // type ctors
+    __ForGen: ForGen, __isGenerator: isGenerator, __genToArray: genToArray,
+    __isMonad: isMonad,
+
+    // operators
+    AND: _AND, OR: _OR, NOT: _NOT,
+    UNARYLOGICNOT: _NOT,
+    UNARYBNOT: (a) => ~a,
+    UNARYMINUS: (a) => -a,
+    UNARYPLUS: (a) => +a,
+    BAND: (a,b)=>a&b, BOR: (a,b)=>a|b, BXOR: (a,b)=>a^b,
+    "<<": (a,b)=>a<<b, ">>": (a,b)=>a>>>b,
+    "!": _CONS, "~": _PUSH, "#": _CONCAT,
+    TO: _TO, STEP: _STEP,
+
+    // i/o
+    PRINT, EMIT, INPUT, CIN,
+
+    // numeric
+    ABS, SGN, INT, FLOOR, CEIL, FIX, ROUND, SQR, CBR,
+    SIN, COS, TAN, ASN, ACO, ATN, SINH, COSH, TANH,
+    EXP, LOG, MIN, MAX, RND,
+
+    // strings
+    SPC, LEFT, RIGHT, MID, CHR,
+
+    // lists
+    LEN, HEAD, TAIL, INIT, LAST, MAP, FOLD, FILTER,
+    ARRAY,
+
+    // graphics / system
+    CLS, CLPX, PLOT, GOTOYX, TEXTFORE, TEXTBACK,
+    POKE, PEEK, GETKEYSDOWN, CPUT, CGET, CSTA,
+
+    // type / option
+    TYPEOF, OPTIONBASE, OPTIONDEBUG, OPTIONTRACE,
+
+    // monads / functional
+    MRET, MLIST, MJOIN,
+    ">>=": _BIND, ">>~": _SEQ,
+    ".":   _COMPOSE, "$": _APPLY, "&": _PIPE, "~<": _CURRY,
+    "<*>": _SEQAPP, "<$>": MAP, "<~>": _SEQCURRYMAP,
+
+    // misc
+    DO: function() { return arguments[arguments.length - 1] },
+    CLEAR: function() { state.vars = _initialConsts() },
+    END: function() { /* compiler emits pc=[Infinity,0] */ },
+    LABEL: function() { /* harvested at compile time */ },
+    DATA:  function() { /* harvested at compile time */ },
+    // DIM as an expression (e.g. `WS = DIM(H, V)`): allocate and return a
+    // freshly zero-filled N-D array. The statement form `DIM A(H, V)` is
+    // compiled inline and never reaches this entry.
+    DIM: function() { return __dim(Array.prototype.slice.call(arguments)) },
+}

assets/disk0/tvdos/include/typesetter.mjs

@@ -0,0 +1,331 @@
+/*
+ * typesetter.mjs - Rich-text typesetter for TVDOS console output.
+ *
+ * Wraps and aligns text using a tiny markup language. Originally lifted
+ * out of taut_helpmsg.js so other tools (motd, help popups, ...) can
+ * share the same formatter.
+ *
+ * Markup
+ * ------
+ *   <b>...</b>   emphasised foreground colour
+ *   <c>...</c>   centre-align this source line
+ *   <r>...</r>   right-align this source line
+ *   <l>...</l>   left-align this source line
+ *   <o>...</o>   virtual typesetting box. Left anchor is the cursor
+ *                column at the open tag, right anchor is the wrap edge.
+ *   default alignment is fully justified (override per-call via opts).
+ *
+ * Entities
+ * --------
+ *   &microtone;          "Microtone" wordmark
+ *   &bul; &ddot; &mdot;  bullet glyphs
+ *   &updn; &udlr;        arrow glyphs
+ *   &keyoffsym; &notecutsym;
+ *   &demisharp; &sharp; &sesquisharp; &doublesharp; &triplesharp; &quadsharp;
+ *   &demiflat; &flat; &sesquiflat; &doubleflat; &tripleflat; &quadflat;
+ *   &accuptick; &accdntick; &accupup; &accdndn;
+ *   &nbsp;               non-breaking space
+ *   &shy;                soft hyphen (currently dropped)
+ *   &lt; &gt;            literal angle brackets
+ *
+ * Usage
+ * -----
+ *   let ts = require("typesetter")
+ *   let lines = ts.typeset(text, width)            // array of width-wide strings
+ *   let lines = ts.typeset(text)                   // width = rest of current row
+ *   let lines = ts.typeset(text, width, { defaultAlign: 'l' })
+ */
+
+
+///////////////////////////////////////////////////////////////////////////////
+// Palette / ANSI helpers
+///////////////////////////////////////////////////////////////////////////////
+
+const COL_TEXT      = 239 // popup body default (== colWHITE)
+const COL_EMPH      = 230 // <b>...</b> highlight (== colVoiceHdr)
+const COL_BRAND     = 211 // first half of "Microtone"
+const COL_BRAND_DIM = 239 // second half of "Microtone"
+
+const fgEsc = (n) => `\x1B[38;5;${n}m`
+const ESC_DEFAULT = fgEsc(COL_TEXT)
+const ESC_EMPH    = fgEsc(COL_EMPH)
+const MICROTONE   = `${fgEsc(COL_BRAND)}Micro${fgEsc(COL_BRAND_DIM)}tone${ESC_DEFAULT}`
+
+
+///////////////////////////////////////////////////////////////////////////////
+// Entity expansion
+///////////////////////////////////////////////////////////////////////////////
+
+// Replace &xxx; entities with their final printable representations.
+function expandEntities(s) {
+    return s
+        .replaceAll('&microtone;',  MICROTONE)
+        .replaceAll('&bul;',        '\u00F9')
+        .replaceAll('&ddot;',       '\u008419u')
+        .replaceAll('&mdot;',       '\u00FA')
+        .replaceAll('&updn;',       '\u008418u')
+        .replaceAll('&udlr;',       '\u008428u\u008429u')
+        .replaceAll('&keyoffsym;',  '\u00A0\u00B1\u00B1\u00A1')
+        .replaceAll('&notecutsym;', '\u00A4\u00A4\u00A4\u00A4')
+        .replaceAll('&nbsp;',       '\u007F')
+        .replaceAll('&shy;',        '')
+        .replaceAll('&lt;',        '<')
+        .replaceAll('&gt;',        '>')
+        .replaceAll('&demisharp;',   '\u0080\u0081')
+        .replaceAll('&sharp;',       '\u0082\u0083')
+        .replaceAll('&sesquisharp;', '\u0084132u\u0085')
+        .replaceAll('&doublesharp;', '\u0086\u0087')
+        .replaceAll('&triplesharp;', '\u0088\u0089')
+        .replaceAll('&quadsharp;',   '\u008A\u008B')
+        .replaceAll('&demiflat;',    '\u008C\u008D')
+        .replaceAll('&flat;',        '\u008E\u008F')
+        .replaceAll('&sesquiflat;',  '\u0090\u0091')
+        .replaceAll('&doubleflat;',  '\u0092\u0093')
+        .replaceAll('&tripleflat;',  '\u0094\u0095')
+        .replaceAll('&quadflat;',    '\u0096\u0097')
+        .replaceAll('&accuptick;',    '\u009A')
+        .replaceAll('&accdntick;',    '\u009B')
+        .replaceAll('&accupup;',    '\u009C')
+        .replaceAll('&accdndn;',    '\u009D')
+}
+
+
+///////////////////////////////////////////////////////////////////////////////
+// Tokeniser
+///////////////////////////////////////////////////////////////////////////////
+
+// Tokenise a (post-entity-expansion) line. Returns an array of:
+//   {type:'word',   text:String, w:int}  - non-breakable run of visible chars (may carry ANSI escapes)
+//   {type:'sp'}                          - a single soft space (eligible for break/expansion)
+//   {type:'anchor', open:Boolean}        - <o>/</o> markers (zero width)
+//
+// Width accounting:
+//   - ANSI escapes (`\x1B[...m`)         : 0 visible chars
+//   - TSVM unicode escapes (`\u0084..u`) : 1 visible char
+//   - non-breaking space (\u007F)        : 1 visible char (consumed as part of a word)
+//   - soft hyphen (\u00AD)               : dropped (not implemented as a break point)
+//   - everything else                    : 1 visible char
+function tokenise(line) {
+    const tokens = []
+    let buf = ''
+    let bufW = 0
+    let i = 0
+
+    const flushWord = () => {
+        if (buf.length > 0) {
+            tokens.push({type: 'word', text: buf, w: bufW})
+            buf = ''
+            bufW = 0
+        }
+    }
+
+    while (i < line.length) {
+        // inline tags (case-sensitive for <b>, case-insensitive for <o>)
+        if (line.slice(i, i + 3) === '<b>')  { buf += ESC_EMPH;    i += 3; continue }
+        if (line.slice(i, i + 4) === '</b>') { buf += ESC_DEFAULT; i += 4; continue }
+        const head3 = line.slice(i, i + 3).toLowerCase()
+        const head4 = line.slice(i, i + 4).toLowerCase()
+        if (head3 === '<o>')  { flushWord(); tokens.push({type: 'anchor', open: true});  i += 3; continue }
+        if (head4 === '</o>') { flushWord(); tokens.push({type: 'anchor', open: false}); i += 4; continue }
+
+        const c  = line[i]
+        const cc = line.charCodeAt(i)
+
+        if (cc === 0x1B) {
+            // pre-existing ANSI escape - copy verbatim, zero visible width
+            const m = line.indexOf('m', i)
+            const end = (m < 0) ? line.length : m + 1
+            buf += line.slice(i, end)
+            i = end
+        }
+        else if (cc === 0x84) {
+            // TSVM \u0084<digits>u escape - copy verbatim, one visible char
+            const u = line.indexOf('u', i)
+            const end = (u < 0) ? line.length : u + 1
+            buf += line.slice(i, end)
+            bufW += 1
+            i = end
+        }
+        else if (c === ' ') {
+            flushWord()
+            tokens.push({type: 'sp'})
+            i += 1
+        }
+        else if (cc === 0x00AD) {
+            // soft hyphen: drop (no break-point handling for now)
+            i += 1
+        }
+        else {
+            buf += c
+            bufW += 1
+            i += 1
+        }
+    }
+    flushWord()
+    return tokens
+}
+
+
+///////////////////////////////////////////////////////////////////////////////
+// Line builder
+///////////////////////////////////////////////////////////////////////////////
+
+// Build wrapped lines from a token stream then format each one according to alignment.
+// Returns an array of strings, each exactly `width` visible chars wide (padded with
+// trailing spaces) so the caller can blit them without further math.
+function wrapAndAlign(tokens, width, alignment) {
+    const lines = [] // each: {tokens, indent, contentW}
+    let curTokens = []
+    let curW = 0
+    let curIndent = 0
+    let nextIndent = 0 // indent the *next* flushed line should use
+
+    const flushLine = () => {
+        // strip trailing soft spaces
+        while (curTokens.length > 0 && curTokens[curTokens.length - 1].type === 'sp') {
+            curTokens.pop()
+            curW -= 1
+        }
+        lines.push({tokens: curTokens, indent: curIndent, contentW: curW})
+        curTokens = []
+        curW = 0
+        curIndent = nextIndent
+    }
+
+    for (const tok of tokens) {
+        if (tok.type === 'anchor') {
+            // anchor opens at the current visible column (accounting for indent)
+            if (tok.open) nextIndent = curIndent + curW
+            else          nextIndent = 0
+            continue
+        }
+
+        if (tok.type === 'sp') {
+            // ignore leading soft spaces on a fresh line
+            if (curW === 0) continue
+            // hard wrap if the line is already at the right edge
+            if (curIndent + curW + 1 > width) { flushLine(); continue }
+            curTokens.push(tok)
+            curW += 1
+            continue
+        }
+
+        // word
+        const tw = tok.w
+        if (curIndent + curW + tw > width) {
+            flushLine()
+            // word too wide for the wrapped line: emit it on its own row (possibly clipped by terminal)
+            if (curIndent + tw > width) {
+                curTokens.push(tok)
+                curW += tw
+                flushLine()
+                continue
+            }
+        }
+        curTokens.push(tok)
+        curW += tw
+    }
+
+    if (curTokens.length > 0 || lines.length === 0) flushLine()
+
+    return lines.map((line, i) => formatLine(line, width, alignment, i === lines.length - 1))
+}
+
+function formatLine(line, totalWidth, alignment, isLast) {
+    if (line.tokens.length === 0) return ' '.repeat(totalWidth)
+
+    const indent    = ' '.repeat(line.indent)
+    const remaining = totalWidth - line.indent - line.contentW
+    const pad       = (n) => (n > 0) ? ' '.repeat(n) : ''
+    const flatText  = () => line.tokens.map(t => (t.type === 'sp') ? ' ' : t.text).join('')
+
+    if (alignment === 'c') {
+        const left = remaining >> 1
+        return indent + pad(left) + flatText() + pad(remaining - left)
+    }
+    if (alignment === 'r') return indent + pad(remaining) + flatText()
+    if (alignment === 'l') return indent + flatText() + pad(remaining)
+
+    // justified: only expand spaces when there's slack and we're not on the
+    // last (or single) wrapped line
+    if (isLast || remaining <= 0) return indent + flatText() + pad(remaining)
+
+    const spaceCount = line.tokens.reduce((n, t) => n + (t.type === 'sp' ? 1 : 0), 0)
+    if (spaceCount === 0) return indent + flatText() + pad(remaining)
+
+    const baseExtra = (remaining / spaceCount) | 0
+    let leftover    = remaining - baseExtra * spaceCount
+
+    let out = indent
+    for (const tok of line.tokens) {
+        if (tok.type === 'sp') {
+            const extra = baseExtra + (leftover > 0 ? 1 : 0)
+            if (leftover > 0) leftover -= 1
+            out += ' '.repeat(1 + extra)
+        } else {
+            out += tok.text
+        }
+    }
+    return out
+}
+
+// Process a single source line: peel a leading <c>/<r>/<l> alignment tag (if present),
+// strip its matching close tag, then tokenise + wrap.
+function typesetSourceLine(line, width, defaultAlign) {
+    if (line.length === 0) return [' '.repeat(width)]
+
+    let alignment = defaultAlign || 'j' // justified default
+    const startMatch = line.match(/^<([crl])>/i)
+    if (startMatch) {
+        alignment = startMatch[1].toLowerCase()
+        line = line.slice(startMatch[0].length)
+        const closeRe = new RegExp(`</${alignment}>$`, 'i')
+        line = line.replace(closeRe, '')
+    }
+
+    const tokens = tokenise(line)
+    return wrapAndAlign(tokens, width, alignment)
+}
+
+function typesetText(text, width, defaultAlign) {
+    text = expandEntities(text)
+    const out = []
+    for (const srcLine of text.split('\n')) {
+        for (const outLine of typesetSourceLine(srcLine, width, defaultAlign)) out.push(outLine)
+    }
+    return out
+}
+
+// Convenience entry: `typeset(text)` defaults the wrap width to "rest of current row".
+// `opts` may be `{ defaultAlign: 'l' | 'c' | 'r' | 'j' }`.
+function typeset(text, customWidth, opts) {
+    let typesetWidth = customWidth
+    if (typesetWidth === undefined) {
+        const SCRW = con.getmaxyx()[1]
+        const currentPosX = con.getyx()[1] // 1-indexed
+        typesetWidth = SCRW - currentPosX + 1
+    }
+    let defaultAlign = (opts && opts.defaultAlign) || 'j'
+    return typesetText(text, typesetWidth, defaultAlign)
+}
+
+
+///////////////////////////////////////////////////////////////////////////////
+// Module exports
+///////////////////////////////////////////////////////////////////////////////
+
+exports = {
+    typeset,
+    typesetText,
+    typesetSourceLine,
+    tokenise,
+    expandEntities,
+    fgEsc,
+    COL_TEXT,
+    COL_EMPH,
+    COL_BRAND,
+    COL_BRAND_DIM,
+    ESC_DEFAULT,
+    ESC_EMPH,
+    MICROTONE,
+}

assets/disk0/tvdos/include/wintex.mjs

@@ -1,3 +1,8 @@
+/**
+ * WinTex — TUI window management and renderer
+ * @author CuriousTorvald
+ */
+
 class WindowObject {
 
     constructor(x, y, w, h, inputProcessor, drawContents, title, drawFrame) {
@@ -91,8 +96,6 @@ class WindowObject {
  * @return [new cursor pos, new scroll pos]
  */
 function scrollVert(dy, listSize, listHeight, currentCursorPos, currentScrollPos, scrollPeek) {
-    let peek = 1
-
     // clamp dy
     if (currentCursorPos + dy > listSize - 1)
         dy = (listSize - 1) - currentCursorPos
@@ -103,13 +106,13 @@ function scrollVert(dy, listSize, listHeight, currentCursorPos, currentScrollPos
     
     // update vertical scroll stats
     if (dy != 0) {
-        let visible = listHeight - 1 - peek
+        let visible = listHeight - 1 - scrollPeek
 
         if (nextRow - currentScrollPos > visible) {
             currentScrollPos = nextRow - visible
         }
-        else if (nextRow - currentScrollPos < 0 + peek) {
+        else if (nextRow - currentScrollPos < 0 + scrollPeek) {
-            currentScrollPos = nextRow - peek // nextRow is less than zero
+            currentScrollPos = nextRow - scrollPeek // nextRow is less than zero
         }
 
         // NOTE: future-proofing here -- scroll clamping is moved outside of go-up/go-down
@@ -140,8 +143,6 @@ function scrollVert(dy, listSize, listHeight, currentCursorPos, currentScrollPos
  * @return [new cursor pos, new scroll pos]
  */
 function scrollHorz(dx, stringSize, stringViewSize, currentCursorPos, currentScrollPos, scrollPeek) {
-    let peek = 1
-
     // clamp dx
     if (currentCursorPos + dx > stringSize - 1)
         dx = (stringSize - 1) - currentCursorPos
@@ -152,13 +153,13 @@ function scrollHorz(dx, stringSize, stringViewSize, currentCursorPos, currentScr
 
     // update vertical scroll stats
     if (dx != 0) {
-        let visible = stringViewSize - 1 - peek
+        let visible = stringViewSize - 1 - scrollPeek
 
         if (nextCol - currentScrollPos > visible) {
             currentScrollPos = nextCol - visible
         }
-        else if (nextCol - currentScrollPos < 0 + peek) {
+        else if (nextCol - currentScrollPos < 0 + scrollPeek) {
-            currentScrollPos = nextCol - peek // nextCol is less than zero
+            currentScrollPos = nextCol - scrollPeek // nextCol is less than zero
         }
 
         // NOTE: future-proofing here -- scroll clamping is moved outside of go-up/go-down

assets/disk0/tvdos/tuidev/Makefile

@@ -0,0 +1,6 @@
+CC = gcc
+CFLAGS = -std=c99 -O3 -Wall -Wextra -Ofast -D_GNU_SOURCE
+
+font_rom_builder:
+	rm -f font_rom_builder
+	$(CC) $(CFLAGS) font_rom_builder.c -o font_rom_builder

assets/disk0/tvdos/tuidev/font_rom_builder.c

@@ -0,0 +1,202 @@
+/*
+ * font_rom_builder.c
+ * Build TSVM 7x14 font ROM from human-readable images (.png, .tga)
+ *
+ * Input: Image with no gaps between characters (7x14 pixels per glyph)
+ * Output: TSVM-compatible font ROM file(s) padded to 1920 bytes
+ *
+ * Usage:
+ *   gcc -O2 -std=c99 -Wall font_rom_builder.c -o font_rom_builder
+ *   ./font_rom_builder <input.png|tga> <output_prefix>
+ *
+ * For 128-char images: outputs <output_prefix>_high.chr
+ * For 256-char images: outputs <output_prefix>_low.chr and <output_prefix>_high.chr
+ *
+ * Image layout:
+ *   - 128 chars: 16 columns × 8 rows = 112×112 pixels
+ *   - 256 chars: 16 columns × 16 rows = 112×224 pixels
+ *             or 32 columns × 8 rows = 224×112 pixels
+ *
+ * ROM format:
+ *   - Each glyph: 14 bytes (one byte per row)
+ *   - Bit 6 = leftmost pixel, Bit 0 = rightmost pixel
+ *   - Each ROM padded to 1920 bytes
+ */
+
+#define _POSIX_C_SOURCE 200809L
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdint.h>
+
+#define GLYPH_W 7
+#define GLYPH_H 14
+#define GLYPH_BYTES 14
+#define ROM_PADDED_SIZE 1920
+
+static void die(const char *msg) {
+    fprintf(stderr, "Error: %s\n", msg);
+    exit(1);
+}
+
+static void write_rom(const char *filename, const uint8_t *glyphs, int glyph_count) {
+    FILE *out = fopen(filename, "wb");
+    if (!out) {
+        fprintf(stderr, "Failed to open output file: %s\n", filename);
+        exit(1);
+    }
+
+    // Write glyph data
+    size_t data_size = glyph_count * GLYPH_BYTES;
+    fwrite(glyphs, 1, data_size, out);
+
+    // Pad to 1920 bytes
+    if (data_size < ROM_PADDED_SIZE) {
+        size_t padding = ROM_PADDED_SIZE - data_size;
+        uint8_t *pad = calloc(padding, 1);
+        fwrite(pad, 1, padding, out);
+        free(pad);
+        fprintf(stderr, "  Wrote %zu bytes + %zu bytes padding = %d bytes total\n",
+                data_size, padding, ROM_PADDED_SIZE);
+    } else {
+        fprintf(stderr, "  Wrote %zu bytes (no padding needed)\n", data_size);
+    }
+
+    fclose(out);
+    fprintf(stderr, "  Output: %s\n", filename);
+}
+
+int main(int argc, char **argv) {
+    if (argc < 3) {
+        fprintf(stderr, "Usage: %s <input.png|tga> <output_prefix>\n", argv[0]);
+        fprintf(stderr, "\n");
+        fprintf(stderr, "Converts human-readable font images to TSVM font ROM format.\n");
+        fprintf(stderr, "\n");
+        fprintf(stderr, "Input requirements:\n");
+        fprintf(stderr, "  - Image with no gaps between characters\n");
+        fprintf(stderr, "  - Each character is 7x14 pixels\n");
+        fprintf(stderr, "  - 128 chars: typically 112x112 (16 cols × 8 rows)\n");
+        fprintf(stderr, "  - 256 chars: typically 112x224 (16 cols × 16 rows)\n");
+        fprintf(stderr, "\n");
+        fprintf(stderr, "Output:\n");
+        fprintf(stderr, "  - 128 chars: <prefix>_high.chr (high ROM only)\n");
+        fprintf(stderr, "  - 256 chars: <prefix>_low.chr + <prefix>_high.chr\n");
+        fprintf(stderr, "  - Each ROM padded to 1920 bytes\n");
+        return 1;
+    }
+
+    const char *input_path = argv[1];
+    const char *output_prefix = argv[2];
+
+    // Get image dimensions using ImageMagick identify
+    char cmd[1024];
+    snprintf(cmd, sizeof(cmd), "identify -format '%%w %%h' \"%s\" 2>/dev/null", input_path);
+
+    FILE *pipe = popen(cmd, "r");
+    if (!pipe) die("Failed to run 'identify' command (ImageMagick required)");
+
+    int img_w = 0, img_h = 0;
+    if (fscanf(pipe, "%d %d", &img_w, &img_h) != 2) {
+        pclose(pipe);
+        die("Failed to read image dimensions (is ImageMagick installed?)");
+    }
+    pclose(pipe);
+
+    fprintf(stderr, "Input: %s (%dx%d)\n", input_path, img_w, img_h);
+
+    // Calculate grid dimensions
+    int cols = img_w / GLYPH_W;
+    int rows = img_h / GLYPH_H;
+    int total_chars = cols * rows;
+
+    if (img_w % GLYPH_W != 0 || img_h % GLYPH_H != 0) {
+        fprintf(stderr, "Warning: Image dimensions not evenly divisible by %dx%d\n",
+                GLYPH_W, GLYPH_H);
+    }
+
+    fprintf(stderr, "Grid: %d columns × %d rows = %d characters\n", cols, rows, total_chars);
+
+    // Validate character count
+    if (total_chars != 128 && total_chars != 256) {
+        fprintf(stderr, "Error: Expected 128 or 256 characters, got %d\n", total_chars);
+        fprintf(stderr, "  For 128 chars: use 112x112 (16×8) or similar layout\n");
+        fprintf(stderr, "  For 256 chars: use 112x224 (16×16) or 224x112 (32×8)\n");
+        return 1;
+    }
+
+    // Read image as grayscale using ImageMagick convert
+    // IMPORTANT: Flatten alpha onto black background first, so transparent pixels become black
+    size_t img_size = img_w * img_h;
+    uint8_t *img_data = malloc(img_size);
+    if (!img_data) die("Memory allocation failed");
+
+    snprintf(cmd, sizeof(cmd),
+             "convert \"%s\" -background black -alpha remove -colorspace Gray -depth 8 gray:- 2>/dev/null",
+             input_path);
+
+    pipe = popen(cmd, "r");
+    if (!pipe) die("Failed to run 'convert' command (ImageMagick required)");
+
+    if (fread(img_data, 1, img_size, pipe) != img_size) {
+        pclose(pipe);
+        die("Failed to read image data from ImageMagick");
+    }
+    pclose(pipe);
+
+    fprintf(stderr, "Read %zu bytes of grayscale data\n", img_size);
+
+    // Extract glyphs
+    uint8_t *glyphs = calloc(total_chars, GLYPH_BYTES);
+    if (!glyphs) die("Memory allocation failed");
+
+    for (int gy = 0; gy < rows; gy++) {
+        for (int gx = 0; gx < cols; gx++) {
+            int glyph_idx = gy * cols + gx;
+            uint8_t *glyph = &glyphs[glyph_idx * GLYPH_BYTES];
+
+            for (int row = 0; row < GLYPH_H; row++) {
+                uint8_t byte = 0;
+                for (int col = 0; col < GLYPH_W; col++) {
+                    int px = gx * GLYPH_W + col;
+                    int py = gy * GLYPH_H + row;
+                    uint8_t pixel = img_data[py * img_w + px];
+
+                    // Threshold: >= 128 is foreground (white/lit)
+                    int is_set = (pixel >= 128) ? 1 : 0;
+
+                    // Pack: bit 6 = leftmost, bit 0 = rightmost
+                    if (is_set) {
+                        byte |= (1u << (6 - col));
+                    }
+                }
+                glyph[row] = byte;
+            }
+        }
+    }
+
+    free(img_data);
+    fprintf(stderr, "Extracted %d glyphs\n", total_chars);
+
+    // Write output ROM file(s)
+    char out_path[1024];
+
+    if (total_chars == 128) {
+        // High ROM only (chars 128-255)
+        snprintf(out_path, sizeof(out_path), "%s.chr", output_prefix);
+        fprintf(stderr, "\nWriting high ROM (128 chars):\n");
+        write_rom(out_path, glyphs, 128);
+    } else {
+        // 256 chars: low ROM (0-127) and high ROM (128-255)
+        snprintf(out_path, sizeof(out_path), "%s_low.chr", output_prefix);
+        fprintf(stderr, "\nWriting low ROM (chars 0-127):\n");
+        write_rom(out_path, glyphs, 128);
+
+        snprintf(out_path, sizeof(out_path), "%s_high.chr", output_prefix);
+        fprintf(stderr, "\nWriting high ROM (chars 128-255):\n");
+        write_rom(out_path, &glyphs[128 * GLYPH_BYTES], 128);
+    }
+
+    free(glyphs);
+    fprintf(stderr, "\nDone.\n");
+    return 0;
+}

buildapp/build_app_linux_arm.sh

@@ -22,6 +22,7 @@ cp -r "../out/$RUNTIME" $DESTDIR/
 
 # Copy over all the assets and a jarfile
 cp -r "../out/TerranBASIC.jar" $DESTDIR/
+cp "../lib/compiler-23.1.10.jar" "../lib/compiler-management-23.1.10.jar" "../lib/truffle-compiler-23.1.10.jar" "../lib/truffle-api-23.1.10.jar" "../lib/truffle-runtime-23.1.10.jar" "../lib/polyglot-23.1.10.jar" "../lib/collections-23.1.10.jar" "../lib/word-23.1.10.jar" "../lib/nativeimage-23.1.10.jar" "../lib/jniutils-23.1.10.jar" $DESTDIR/
 
 # Pack everything to AppImage
 ARCH=arm_aarch64 "./$APPIMAGETOOL" $DESTDIR "out/$DESTDIR.AppImage" || { echo 'Building AppImage failed' >&2; exit 1; }

buildapp/build_app_linux_x86.sh

@@ -22,6 +22,7 @@ cp -r "../out/$RUNTIME" $DESTDIR/
 
 # Copy over all the assets and a jarfile
 cp -r "../out/TerranBASIC.jar" $DESTDIR/
+cp "../lib/compiler-23.1.10.jar" "../lib/compiler-management-23.1.10.jar" "../lib/truffle-compiler-23.1.10.jar" "../lib/truffle-api-23.1.10.jar" "../lib/truffle-runtime-23.1.10.jar" "../lib/polyglot-23.1.10.jar" "../lib/collections-23.1.10.jar" "../lib/word-23.1.10.jar" "../lib/nativeimage-23.1.10.jar" "../lib/jniutils-23.1.10.jar" $DESTDIR/
 
 # Pack everything to AppImage
 "./$APPIMAGETOOL" $DESTDIR "out/$DESTDIR.AppImage" || { echo 'Building AppImage failed' >&2; exit 1; }

buildapp/build_app_mac_arm.sh

@@ -23,5 +23,6 @@ cp -r "../out/$RUNTIME" $DESTDIR/Contents/MacOS/
 
 # Copy over all the assets and a jarfile
 cp -r "../out/TerranBASIC.jar" $DESTDIR/Contents/MacOS/
+cp "../lib/compiler-23.1.10.jar" "../lib/compiler-management-23.1.10.jar" "../lib/truffle-compiler-23.1.10.jar" "../lib/truffle-api-23.1.10.jar" "../lib/truffle-runtime-23.1.10.jar" "../lib/polyglot-23.1.10.jar" "../lib/collections-23.1.10.jar" "../lib/word-23.1.10.jar" "../lib/nativeimage-23.1.10.jar" "../lib/jniutils-23.1.10.jar" $DESTDIR/Contents/MacOS/
 
 echo "Build successful: $DESTDIR"

buildapp/build_app_mac_x86.sh

@@ -23,5 +23,6 @@ cp -r "../out/$RUNTIME" $DESTDIR/Contents/MacOS/
 
 # Copy over all the assets and a jarfile
 cp -r "../out/TerranBASIC.jar" $DESTDIR/Contents/MacOS/
+cp "../lib/compiler-23.1.10.jar" "../lib/compiler-management-23.1.10.jar" "../lib/truffle-compiler-23.1.10.jar" "../lib/truffle-api-23.1.10.jar" "../lib/truffle-runtime-23.1.10.jar" "../lib/polyglot-23.1.10.jar" "../lib/collections-23.1.10.jar" "../lib/word-23.1.10.jar" "../lib/nativeimage-23.1.10.jar" "../lib/jniutils-23.1.10.jar" $DESTDIR/Contents/MacOS/
 
 echo "Build successful: $DESTDIR"

buildapp/build_app_windows_x86.sh

@@ -18,6 +18,7 @@ cp -r "../out/$RUNTIME" $DESTDIR/
 
 # Copy over all the assets and a jarfile
 cp -r "../out/TerranBASIC.jar" $DESTDIR/
+cp "../lib/compiler-23.1.10.jar" "../lib/compiler-management-23.1.10.jar" "../lib/truffle-compiler-23.1.10.jar" "../lib/truffle-api-23.1.10.jar" "../lib/truffle-runtime-23.1.10.jar" "../lib/polyglot-23.1.10.jar" "../lib/collections-23.1.10.jar" "../lib/word-23.1.10.jar" "../lib/nativeimage-23.1.10.jar" "../lib/jniutils-23.1.10.jar" $DESTDIR/
 
 # Temporary solution: zip everything
 zip -r -9 -l "out/$DESTDIR.zip" $DESTDIR

buildapp/tbaslinux_arm/AppRun

@@ -1,3 +1,4 @@
 #!/bin/bash
 cd "${0%/*}"
-./runtime-linux-arm/bin/java -Xms128M -Xmx2G -Dswing.aatext=true -Dawt.useSystemAAFontSettings=lcd -jar ./TerranBASIC.jar
+GRAAL_MODULE_PATH=compiler-23.1.10.jar:compiler-management-23.1.10.jar:truffle-compiler-23.1.10.jar:truffle-api-23.1.10.jar:truffle-runtime-23.1.10.jar:polyglot-23.1.10.jar:collections-23.1.10.jar:word-23.1.10.jar:nativeimage-23.1.10.jar:jniutils-23.1.10.jar
+./runtime-linux-arm/bin/java --upgrade-module-path=$GRAAL_MODULE_PATH -XX:+UnlockExperimentalVMOptions -XX:+EnableJVMCI --add-exports=java.base/jdk.internal.misc=jdk.internal.vm.compiler -Xms128M -Xmx2G -Dswing.aatext=true -Dawt.useSystemAAFontSettings=lcd -jar ./TerranBASIC.jar

buildapp/tbaslinux_x86/AppRun

@@ -1,3 +1,4 @@
 #!/bin/bash
 cd "${0%/*}"
-./runtime-linux-x86/bin/java -Xms128M -Xmx2G -Dswing.aatext=true -Dawt.useSystemAAFontSettings=lcd -jar ./TerranBASIC.jar
+GRAAL_MODULE_PATH=compiler-23.1.10.jar:compiler-management-23.1.10.jar:truffle-compiler-23.1.10.jar:truffle-api-23.1.10.jar:truffle-runtime-23.1.10.jar:polyglot-23.1.10.jar:collections-23.1.10.jar:word-23.1.10.jar:nativeimage-23.1.10.jar:jniutils-23.1.10.jar
+./runtime-linux-x86/bin/java --upgrade-module-path=$GRAAL_MODULE_PATH -XX:+UnlockExperimentalVMOptions -XX:+EnableJVMCI --add-exports=java.base/jdk.internal.misc=jdk.internal.vm.compiler -Xms128M -Xmx2G -Dswing.aatext=true -Dawt.useSystemAAFontSettings=lcd -jar ./TerranBASIC.jar