vic20: default tiny bios

Author: sehugg

presets/vic20/cartheader.dasm

@@ -0,0 +1,5 @@
+ org $a000-2	; so we can write the ...
+ .word $a000	; cartridge 2-byte header
+ .word Start	; start vector
+ .word Start	; RESTORE vector
+ .byte $41, $30, $c3, $c2, $cd ; "A0CBM"

src/common/wasmplatform.ts

@@ -66,13 +66,16 @@ export abstract class BaseWASMMachine {
       this.exports = wasmResult.exports;
     } else throw new Error('could not load WASM file');
   }
+  allocateBIOS(biosBinary: Uint8Array) {
+    this.biosptr = this.exports.malloc(biosBinary.byteLength);
+    this.biosarr = new Uint8Array(this.exports.memory.buffer, this.biosptr, biosBinary.byteLength);
+}
   async fetchBIOS() {
     var biosResponse = await fetch('res/'+this.prefix+'.bios');
     if (biosResponse.status == 200 || (biosResponse as any as Blob).size) {
-      var biosBinary = await biosResponse.arrayBuffer();
-      this.biosptr = this.exports.malloc(biosBinary.byteLength);
-      this.biosarr = new Uint8Array(this.exports.memory.buffer, this.biosptr, biosBinary.byteLength);
-      this.loadBIOS(new Uint8Array(biosBinary));
+      var biosBinary = new Uint8Array(await biosResponse.arrayBuffer());
+      this.allocateBIOS(biosBinary);
+      this.loadBIOS(biosBinary);
     } else throw new Error('could not load BIOS file');
   }
   async initWASM() {

src/machine/vic20.ts

@@ -26,6 +26,12 @@ export class VIC20_WASMMachine extends BaseWASMMachine implements Machine, Probe
   loadBIOS(srcArray: Uint8Array) {
     super.loadBIOS(srcArray);
   }
+  async fetchBIOS() {
+    let bios = new Uint8Array(20480);
+    bios.set(DEFAULT_BIOS, bios.length - DEFAULT_BIOS.length);
+    this.allocateBIOS(bios);
+    this.loadBIOS(new Uint8Array(bios));
+  }
   reset() {
     super.reset();
     // clear keyboard
@@ -170,3 +176,19 @@ export class VIC20_WASMMachine extends BaseWASMMachine implements Machine, Probe
   }
 
 }
+
+// pretty much just runs autostart ROM and not much else...
+const DEFAULT_BIOS = [
+  0xA2, 0x10, 0xA0, 0x91, 0x60, 0x71, 0xFF, 0x71, 0xFF, 0x5C, 0xFF, 0xA2, 0xFF, 0x78, 0x9A, 0xD8, 
+  0x6C, 0x00, 0xA0, 0xA2, 0x45, 0xA0, 0xFF, 0x18, 0x78, 0x6C, 0x18, 0x03, 0x48, 0x8A, 0x48, 0x98, 
+  0x48, 0xAD, 0x1D, 0x91, 0x10, 0x03, 0x6C, 0x02, 0xA0, 0x4C, 0x6C, 0xFF, 0x68, 0xA8, 0x68, 0xAA, 
+  0x68, 0x40, 0x48, 0x8A, 0x48, 0x98, 0x48, 0xBA, 0xBD, 0x04, 0x01, 0x29, 0x10, 0xF0, 0x03, 0x6C, 
+  0x16, 0x03, 0x6C, 0x14, 0x03, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x4C, 0x53, 0xFF, 0x4C, 0x44, 0xFF, 
+  0x4C, 0x44, 0xFF, 0x4C, 0x44, 0xFF, 0x4C, 0x44, 0xFF, 0x4C, 0x44, 0xFF, 0x4C, 0x44, 0xFF, 0x4C, 
+  0x44, 0xFF, 0x4C, 0x44, 0xFF, 0x4C, 0x44, 0xFF, 0x4C, 0x44, 0xFF, 0x4C, 0x44, 0xFF, 0x4C, 0x44, 
+  0xFF, 0x4C, 0x44, 0xFF, 0x4C, 0x44, 0xFF, 0x4C, 0x44, 0xFF, 0x4C, 0x44, 0xFF, 0x4C, 0x44, 0xFF, 
+  0x6C, 0x1A, 0x03, 0x6C, 0x1C, 0x03, 0x6C, 0x1E, 0x03, 0x6C, 0x20, 0x03, 0x6C, 0x22, 0x03, 0x6C, 
+  0x24, 0x03, 0x6C, 0x26, 0x03, 0x4C, 0x44, 0xFF, 0x4C, 0x44, 0xFF, 0x4C, 0x44, 0xFF, 0x4C, 0x44, 
+  0xFF, 0x6C, 0x28, 0x03, 0x6C, 0x2A, 0x03, 0x6C, 0x2C, 0x03, 0x4C, 0x44, 0xFF, 0x4C, 0x44, 0xFF, 
+  0x4C, 0x44, 0xFF, 0x4C, 0x40, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x58, 0xFF, 0x4B, 0xFF, 0x72, 0xFF
+];

src/platform/vic20.ts

@@ -5,9 +5,9 @@ import { PLATFORMS } from "../common/emu";
 import { BaseMAME6502Platform } from "../common/mameplatform";
 
 const VIC20_PRESETS = [
-  {id:'hello.dasm', name:'Hello World (ASM)'},
+//  {id:'hello.dasm', name:'Hello World (ASM)'},
   {id:'hellocart.dasm', name:'Hello Cartridge (ASM)'},
-  {id:'siegegame.c', name:'Siege Game (C)'},
+//  {id:'siegegame.c', name:'Siege Game (C)'},
 ];
 
 const VIC20_MEMORY_MAP = { main:[