reading image files in graphics adapter

assets/disk0/make4096pal.js

@@ -0,0 +1,14 @@
+let s = []
+for (let r=0;r<16;r++) {
+for (let g=0;g<16;g++) {
+for (let b=0;b<16;b++) {
+    let rb = r*16+r
+    let gb = g*16+r
+    let bb = b*16+r
+    s.push(rb,gb,bb)
+}
+}
+}
+
+filesystem.open("A","4096.data","W")
+filesystem.writeBytes("A",s)