graphics: preventing cursorxy(32,80) from scrolling the screen

assets/bios/quick.js

@@ -0,0 +1,32 @@
+
+// probe bootable device
+
+var _BIOS = {};
+
+// Syntax: [Port, Drive-number]
+// Port #0-3: Serial port 1-4
+//      #4+ : Left for future extension
+// Drive-number always starts at 1
+_BIOS.FIRST_BOOTABLE_PORT = [0,1]; // ah screw it
+
+Object.freeze(_BIOS);
+
+///////////////////////////////////////////////////////////////////////////////
+
+// load a bootsector using 'LOADBOOT'
+let portNumber = 0;
+let driveStatus = 0;
+while (portNumber < 4) {
+    if (com.areYouThere(portNumber)) {
+        com.sendMessage(portNumber, "LOADBOOT");
+        driveStatus = com.getStatusCode(portNumber);
+        if (driveStatus == 0) break;
+    }
+    portNumber += 1;
+}
+if (portNumber < 4) {
+    eval(com.fetchResponse(portNumber).trimNull());
+}
+else {
+    printerrln("No bootable medium found.");
+}

assets/disk0/tvdos/bin/command.js

@@ -50,7 +50,7 @@ function greet() {
         con.color_pair(0,253);
         print(" ".repeat(greetLeftPad)+welcome_text+" ".repeat(greetRightPad));
         con.color_pair(253,255);
-        con.addch(16);
+        con.addch(16);print('  ');
         con.move(3,1);
     }
     else
@@ -434,7 +434,7 @@ if (goInteractive) {
                     if (isNaN(errorlevel)) errorlevel = 2;
                 }
                 catch (e) {
-                    printerrln("\n"+e);
+                    printerrln("\n"+(e.stack || e));
                     if (errorlevel === 0 || isNaN(errorlevel)) {
                         errorlevel = 1; // generic failure
                     }

assets/disk0/tvdos/tuidev/demo.js

@@ -0,0 +1,76 @@
+/*
+Screen:
+===================
+Titlebar
+===================
+
+C A N V A S
+
+===================
+
+there are usually two separate canvases: main-screen and menu-screen
+*/
+
+class SimpleScreen {
+
+    constructor(title) {
+        this.title = title;
+        this.termWidth = con.getmaxyx()[1];
+        this.termHeight = con.getmaxyx()[0];
+    }
+
+    drawTitlebar() {
+
+        let titleLeftPad = (this.termWidth - this.title.length - 6) >> 1;
+        let titleRightPad = this.termWidth - titleLeftPad - this.title.length - 6;
+
+        con.move(1,1);
+        con.color_pair(253,255);
+        print('  ');con.addch(17);
+        con.color_pair(0,253);
+        print(" ".repeat(titleLeftPad)+this.title+" ".repeat(titleRightPad));
+        con.color_pair(253,255);
+        con.addch(16);print('  ');
+    }
+    redraw() {
+        con.color_pair(239,255);
+        con.clear();
+        this.drawTitlebar();
+        if (this.canvas !== undefined) this.canvas.redraw();
+    }
+    update() {
+        if (this.canvas !== undefined) this.canvas.update();
+    }
+}
+
+class Canvas {
+    constructor(identifier) {
+        this.id = identifier;
+    }
+    redraw() {}
+    update() {}
+}
+
+class Demo extends SimpleScreen {
+    constructor(title) {
+        super(title);
+        let mainCanvas = new Canvas("main");
+        mainCanvas.redraw = () => {
+
+        }
+        mainCanvas.update = () => {
+            con.move(2 + (Math.random()*(this.termHeight - 1)), 1 + (Math.random()*this.termWidth));
+            con.addch(0xB3 + (Math.random()*39));
+        }
+
+        this.mainCanvas = mainCanvas
+        this.canvas = this.mainCanvas;
+    }
+}
+
+let s = new Demo("Ctrl-C to exit");
+s.redraw();
+while (!con.hitterminate()) {
+    s.update();
+}
+con.clear();

src/net/torvald/tsvm/AppLoader.java

@@ -30,7 +30,7 @@ public class AppLoader {
         //VM vm = new VM(64 << 10, new TheRealWorld(), new VMProgramRom[]{BasicBios.INSTANCE, BasicRom.INSTANCE});
         //VM vm = new VM(64 << 10, new TheRealWorld(), new VMProgramRom[]{OEMBios.INSTANCE, BasicRom.INSTANCE});
 
-        VM vm = new VM(64 << 10, new TheRealWorld(), new VMProgramRom[]{GenericBios.INSTANCE});
+        VM vm = new VM(64 << 10, new TheRealWorld(), new VMProgramRom[]{QuickBios.INSTANCE});
         //VM vm = new VM(64 << 10, new TheRealWorld(), new VMProgramRom[]{TBASRelBios.INSTANCE});
         new LwjglApplication(new VMGUI(vm, appConfig), appConfig);
     }

src/net/torvald/tsvm/peripheral/GraphicsAdapter.kt

@@ -123,7 +123,7 @@ open class GraphicsAdapter(val vm: VM, val config: AdapterConfig, val sgr: Super
         var newx = x
         var newy = y
 
-        if (newx >= TEXT_COLS) {
+        if (newx > TEXT_COLS) {
             newx = 0
             newy += 1
         }

src/net/torvald/tsvm/peripheral/TTY.kt

@@ -39,7 +39,7 @@ class TTY(val vm: VM) : GlassTty(TEXT_ROWS, TEXT_COLS), PeriBase {
         var newx = x
         var newy = y
 
-        if (newx >= TEXT_COLS) {
+        if (newx > TEXT_COLS) {
             newx = 0
             newy += 1
         }

src/net/torvald/tsvm/peripheral/VMProgramRom.kt

@@ -30,6 +30,25 @@ object GenericBios : VMProgramRom {
     override fun get(addr: Int): Byte = contents[addr]
 }
 
+object QuickBios : VMProgramRom {
+    private val contents: ByteArray
+
+    init {
+        val bytes = File("./assets/bios/quick.js").readBytes()
+        contents = bytes.sliceArray(0 until minOf(65536, bytes.size))
+    }
+
+    override fun readAll(): String {
+        // check if bios is compressed in gzip
+        return if (contents.startsWith(GZIP_HEADER))
+            CompressorDelegate.decomp(contents).toString(VM.CHARSET)
+        else
+            contents.toString(VM.CHARSET)
+    }
+
+    override fun get(addr: Int): Byte = contents[addr]
+}
+
 object BasicBios : VMProgramRom {
     private val contents: ByteArray