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<!-- Standalone Generated By Octo (octo-ide.com) -->
<script>data={"program":"","options":{},
"rom":[
162,46,98,0,97,0,100,1,209,33,243,10,67,5,34,38,67,7,34,30,67,8,34,42,67,9,34,34,18,8,129,69,0,238,113,1,0,238,130,69,0,238,114,1,0,238,128
]}</script
>
<script>"use strict";
function haltBreakpoint(name) {
console.log(name);
}
function invertKeymap(k) {
return Object.keys(k).reduce((a,b) => {
Object.keys(k[b]).forEach(x => a[x]=+b)
return a
}, {})
}
function getPref(key) {
try { return JSON.parse(localStorage.getItem(key)) }
catch(e) { console.log(e); return null }
}
function setPref(key, value) {
try { localStorage.setItem(key, JSON.stringify(value)) }
catch(e) { console.log(e); }
}
var keymap = (this.STATIC_KEYMAP) || getPref('octoKeymap') || {
0x0: { x:1 },
0x1: { 1:1 },
0x2: { 2:1 },
0x3: { 3:1 },
0x4: { q:1 },
0x5: { w:1, ArrowUp:1 },
0x6: { e:1, ' ':1 },
0x7: { a:1, ArrowLeft:1 },
0x8: { s:1, ArrowDown:1 },
0x9: { d:1, ArrowRight:1 },
0xA: { z:1 },
0xB: { c:1 },
0xC: { 4:1 },
0xD: { r:1 },
0xE: { f:1 },
0xF: { v:1 },
}
var keymapInverse = invertKeymap(keymap)
var smallfonts = {
octo: [
0xF0, 0x90, 0x90, 0x90, 0xF0, // 0
0x20, 0x60, 0x20, 0x20, 0x70, // 1
0xF0, 0x10, 0xF0, 0x80, 0xF0, // 2
0xF0, 0x10, 0xF0, 0x10, 0xF0, // 3
0x90, 0x90, 0xF0, 0x10, 0x10, // 4
0xF0, 0x80, 0xF0, 0x10, 0xF0, // 5
0xF0, 0x80, 0xF0, 0x90, 0xF0, // 6
0xF0, 0x10, 0x20, 0x40, 0x40, // 7
0xF0, 0x90, 0xF0, 0x90, 0xF0, // 8
0xF0, 0x90, 0xF0, 0x10, 0xF0, // 9
0xF0, 0x90, 0xF0, 0x90, 0x90, // A
0xE0, 0x90, 0xE0, 0x90, 0xE0, // B
0xF0, 0x80, 0x80, 0x80, 0xF0, // C
0xE0, 0x90, 0x90, 0x90, 0xE0, // D
0xF0, 0x80, 0xF0, 0x80, 0xF0, // E
0xF0, 0x80, 0xF0, 0x80, 0x80, // F
],
vip: [
0xF0, 0x90, 0x90, 0x90, 0xF0,
0x60, 0x20, 0x20, 0x20, 0x70,
0xF0, 0x10, 0xF0, 0x80, 0xF0,
0xF0, 0x10, 0xF0, 0x10, 0xF0,
0xA0, 0xA0, 0xF0, 0x20, 0x20,
0xF0, 0x80, 0xF0, 0x10, 0xF0,
0xF0, 0x80, 0xF0, 0x90, 0xF0,
0xF0, 0x10, 0x10, 0x10, 0x10,
0xF0, 0x90, 0xF0, 0x90, 0xF0,
0xF0, 0x90, 0xF0, 0x10, 0xF0,
0xF0, 0x90, 0xF0, 0x90, 0x90,
0xF0, 0x50, 0x70, 0x50, 0xF0,
0xF0, 0x80, 0x80, 0x80, 0xF0,
0xF0, 0x50, 0x50, 0x50, 0xF0,
0xF0, 0x80, 0xF0, 0x80, 0xF0,
0xF0, 0x80, 0xF0, 0x80, 0x80,
],
dream6800: [
0xE0, 0xA0, 0xA0, 0xA0, 0xE0,
0x40, 0x40, 0x40, 0x40, 0x40,
0xE0, 0x20, 0xE0, 0x80, 0xE0,
0xE0, 0x20, 0xE0, 0x20, 0xE0,
0x80, 0xA0, 0xA0, 0xE0, 0x20,
0xE0, 0x80, 0xE0, 0x20, 0xE0,
0xE0, 0x80, 0xE0, 0xA0, 0xE0,
0xE0, 0x20, 0x20, 0x20, 0x20,
0xE0, 0xA0, 0xE0, 0xA0, 0xE0,
0xE0, 0xA0, 0xE0, 0x20, 0xE0,
0xE0, 0xA0, 0xE0, 0xA0, 0xA0,
0xC0, 0xA0, 0xE0, 0xA0, 0xC0,
0xE0, 0x80, 0x80, 0x80, 0xE0,
0xC0, 0xA0, 0xA0, 0xA0, 0xC0,
0xE0, 0x80, 0xE0, 0x80, 0xE0,
0xE0, 0x80, 0xC0, 0x80, 0x80,
],
eti660: [
0xE0, 0xA0, 0xA0, 0xA0, 0xE0,
0x20, 0x20, 0x20, 0x20, 0x20,
0xE0, 0x20, 0xE0, 0x80, 0xE0,
0xE0, 0x20, 0xE0, 0x20, 0xE0,
0xA0, 0xA0, 0xE0, 0x20, 0x20,
0xE0, 0x80, 0xE0, 0x20, 0xE0,
0xE0, 0x80, 0xE0, 0xA0, 0xE0,
0xE0, 0x20, 0x20, 0x20, 0x20,
0xE0, 0xA0, 0xE0, 0xA0, 0xE0,
0xE0, 0xA0, 0xE0, 0x20, 0xE0,
0xE0, 0xA0, 0xE0, 0xA0, 0xA0,
0x80, 0x80, 0xE0, 0xA0, 0xE0,
0xE0, 0x80, 0x80, 0x80, 0xE0,
0x20, 0x20, 0xE0, 0xA0, 0xE0,
0xE0, 0x80, 0xE0, 0x80, 0xE0,
0xE0, 0x80, 0xC0, 0x80, 0x80,
],
fish: [
0x60, 0xA0, 0xA0, 0xA0, 0xC0,
0x40, 0xC0, 0x40, 0x40, 0xE0,
0xC0, 0x20, 0x40, 0x80, 0xE0,
0xC0, 0x20, 0x40, 0x20, 0xC0,
0x20, 0xA0, 0xE0, 0x20, 0x20,
0xE0, 0x80, 0xC0, 0x20, 0xC0,
0x40, 0x80, 0xC0, 0xA0, 0x40,
0xE0, 0x20, 0x60, 0x40, 0x40,
0x40, 0xA0, 0x40, 0xA0, 0x40,
0x40, 0xA0, 0x60, 0x20, 0x40,
0x40, 0xA0, 0xE0, 0xA0, 0xA0,
0xC0, 0xA0, 0xC0, 0xA0, 0xC0,
0x60, 0x80, 0x80, 0x80, 0x60,
0xC0, 0xA0, 0xA0, 0xA0, 0xC0,
0xE0, 0x80, 0xC0, 0x80, 0xE0,
0xE0, 0x80, 0xC0, 0x80, 0x80,
],
}
var bigfonts = {
octo: [
0xFF, 0xFF, 0xC3, 0xC3, 0xC3, 0xC3, 0xC3, 0xC3, 0xFF, 0xFF, // 0
0x18, 0x78, 0x78, 0x18, 0x18, 0x18, 0x18, 0x18, 0xFF, 0xFF, // 1
0xFF, 0xFF, 0x03, 0x03, 0xFF, 0xFF, 0xC0, 0xC0, 0xFF, 0xFF, // 2
0xFF, 0xFF, 0x03, 0x03, 0xFF, 0xFF, 0x03, 0x03, 0xFF, 0xFF, // 3
0xC3, 0xC3, 0xC3, 0xC3, 0xFF, 0xFF, 0x03, 0x03, 0x03, 0x03, // 4
0xFF, 0xFF, 0xC0, 0xC0, 0xFF, 0xFF, 0x03, 0x03, 0xFF, 0xFF, // 5
0xFF, 0xFF, 0xC0, 0xC0, 0xFF, 0xFF, 0xC3, 0xC3, 0xFF, 0xFF, // 6
0xFF, 0xFF, 0x03, 0x03, 0x06, 0x0C, 0x18, 0x18, 0x18, 0x18, // 7
0xFF, 0xFF, 0xC3, 0xC3, 0xFF, 0xFF, 0xC3, 0xC3, 0xFF, 0xFF, // 8
0xFF, 0xFF, 0xC3, 0xC3, 0xFF, 0xFF, 0x03, 0x03, 0xFF, 0xFF, // 9
0x7E, 0xFF, 0xC3, 0xC3, 0xC3, 0xFF, 0xFF, 0xC3, 0xC3, 0xC3, // A
0xFC, 0xFC, 0xC3, 0xC3, 0xFC, 0xFC, 0xC3, 0xC3, 0xFC, 0xFC, // B
0x3C, 0xFF, 0xC3, 0xC0, 0xC0, 0xC0, 0xC0, 0xC3, 0xFF, 0x3C, // C
0xFC, 0xFE, 0xC3, 0xC3, 0xC3, 0xC3, 0xC3, 0xC3, 0xFE, 0xFC, // D
0xFF, 0xFF, 0xC0, 0xC0, 0xFF, 0xFF, 0xC0, 0xC0, 0xFF, 0xFF, // E
0xFF, 0xFF, 0xC0, 0xC0, 0xFF, 0xFF, 0xC0, 0xC0, 0xC0, 0xC0 // F
],
schip: [
0x3C, 0x7E, 0xE7, 0xC3, 0xC3, 0xC3, 0xC3, 0xE7, 0x7E, 0x3C,
0x18, 0x38, 0x58, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x3C,
0x3E, 0x7F, 0xC3, 0x06, 0x0C, 0x18, 0x30, 0x60, 0xFF, 0xFF,
0x3C, 0x7E, 0xC3, 0x03, 0x0E, 0x0E, 0x03, 0xC3, 0x7E, 0x3C,
0x06, 0x0E, 0x1E, 0x36, 0x66, 0xC6, 0xFF, 0xFF, 0x06, 0x06,
0xFF, 0xFF, 0xC0, 0xC0, 0xFC, 0xFE, 0x03, 0xC3, 0x7E, 0x3C,
0x3E, 0x7C, 0xE0, 0xC0, 0xFC, 0xFE, 0xC3, 0xC3, 0x7E, 0x3C,
0xFF, 0xFF, 0x03, 0x06, 0x0C, 0x18, 0x30, 0x60, 0x60, 0x60,
0x3C, 0x7E, 0xC3, 0xC3, 0x7E, 0x7E, 0xC3, 0xC3, 0x7E, 0x3C,
0x3C, 0x7E, 0xC3, 0xC3, 0x7F, 0x3F, 0x03, 0x03, 0x3E, 0x7C,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // no hex chars!
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
],
fish: [
0x7C, 0xC6, 0xCE, 0xDE, 0xD6, 0xF6, 0xE6, 0xC6, 0x7C, 0x00, // at most 7x9 pixels!
0x10, 0x30, 0xF0, 0x30, 0x30, 0x30, 0x30, 0x30, 0xFC, 0x00,
0x78, 0xCC, 0xCC, 0x0C, 0x18, 0x30, 0x60, 0xCC, 0xFC, 0x00,
0x78, 0xCC, 0x0C, 0x0C, 0x38, 0x0C, 0x0C, 0xCC, 0x78, 0x00,
0x0C, 0x1C, 0x3C, 0x6C, 0xCC, 0xFE, 0x0C, 0x0C, 0x1E, 0x00,
0xFC, 0xC0, 0xC0, 0xC0, 0xF8, 0x0C, 0x0C, 0xCC, 0x78, 0x00,
0x38, 0x60, 0xC0, 0xC0, 0xF8, 0xCC, 0xCC, 0xCC, 0x78, 0x00,
0xFE, 0xC6, 0xC6, 0x06, 0x0C, 0x18, 0x30, 0x30, 0x30, 0x00,
0x78, 0xCC, 0xCC, 0xEC, 0x78, 0xDC, 0xCC, 0xCC, 0x78, 0x00,
0x7C, 0xC6, 0xC6, 0xC6, 0x7C, 0x18, 0x18, 0x30, 0x70, 0x00,
0x30, 0x78, 0xCC, 0xCC, 0xCC, 0xFC, 0xCC, 0xCC, 0xCC, 0x00,
0xFC, 0x66, 0x66, 0x66, 0x7C, 0x66, 0x66, 0x66, 0xFC, 0x00,
0x3C, 0x66, 0xC6, 0xC0, 0xC0, 0xC0, 0xC6, 0x66, 0x3C, 0x00,
0xF8, 0x6C, 0x66, 0x66, 0x66, 0x66, 0x66, 0x6C, 0xF8, 0x00,
0xFE, 0x62, 0x60, 0x64, 0x7C, 0x64, 0x60, 0x62, 0xFE, 0x00,
0xFE, 0x66, 0x62, 0x64, 0x7C, 0x64, 0x60, 0x60, 0xF0, 0x00,
],
none: new Array(16*10).fill(0x00),
}
var fontsets = {
octo : { small: smallfonts.octo, big: bigfonts.octo },
vip : { small: smallfonts.vip, big: bigfonts.none },
dream6800: { small: smallfonts.dream6800, big: bigfonts.none },
eti660 : { small: smallfonts.eti660, big: bigfonts.none },
schip : { small: smallfonts.octo, big: bigfonts.schip },
fish : { small: smallfonts.fish, big: bigfonts.fish },
}
////////////////////////////////////
//
// The Chip8 Interpreter:
//
////////////////////////////////////
function Emulator() {
// persistent configuration settings
this.tickrate = 20;
this.fillColor = "#FFCC00";
this.fillColor2 = "#FF6600";
this.blendColor = "#662200";
this.backgroundColor = "#996600";
this.buzzColor = "#FFAA00";
this.quietColor = "#000000";
this.shiftQuirks = false;
this.loadStoreQuirks = false;
this.vfOrderQuirks = false;
this.clipQuirks = false;
this.jumpQuirks = false;
this.logicQuirks = false;
this.vBlankQuirks = false;
this.enableXO = true;
this.screenRotation = 0;//must be 0, 90, 180, or 270
this.maxSize = 3584;
this.touchInputMode = 'none';
this.maskFormatOverride = true;
this.numericFormatStr = "default";
this.fontStyle = 'octo';
// interpreter state
this.p = [[],[]]; // pixels
this.m = []; // memory (bytes)
this.r = []; // return stack
this.v = []; // registers
this.pc = 0; // program counter
this.i = 0; // index register
this.dt = 0; // delay timer
this.st = 0; // sound timer
this.hires = false; // are we in SuperChip high res mode?
this.flags = []; // semi-persistent hp48 flag vars
this.pattern = []; // audio pattern buffer
this.plane = 1; // graphics plane
this.profile_data = {};
// control/debug state
this.keys = {}; // track keys which are pressed
this.waiting = false; // are we waiting for a keypress?
this.waitReg = -1; // destination register of an awaited key
this.halted = true;
this.breakpoint = false;
this.metadata = {};
this.tickCounter = 0;
this.linted = false;
// external interface stubs
this.exitVector = function() {} // fired by 'exit'
this.importFlags = function() { return [0, 0, 0, 0, 0, 0, 0, 0]; } // load persistent flags
this.exportFlags = function(flags) {} // save persistent flags
this.buzzTrigger = function(ticks, remainingTicks) {} // fired when buzzer played
this.init = function(rom) {
// initialise memory with a new array to ensure that it is of the right size and is initiliased to 0
this.m = this.enableXO ? new Uint8Array(0x10000) : new Uint8Array(0x1000);
this.p = [[], []];
if (this.enableXO)
for(var z = 0; z < 64*128; z++) { this.p[0][z] = 0; this.p[1][z] = 0; }
else
for(var z = 0; z < 32*64; z++) { this.p[0][z] = 0; this.p[1][z] = 0; }
// initialize memory
var font = fontsets[this.fontStyle];
for(var z = 0; z < 32*64; z++) { this.p[0][z] = 0; this.p[1][z] = 0; }
for(var z = 0; z < font.small.length;z++) { this.m[z] = font.small[z]; }
for(var z = 0; z < font.big.length; z++) { this.m[z + font.small.length] = font.big[z]; }
for(var z = 0; z < rom.rom.length; z++) { this.m[0x200+z] = rom.rom[z]; }
for(var z = 0; z < 16; z++) { this.v[z] = 0; }
for(var z = 0; z < 16; z++) { this.pattern[z] = 0; }
// initialize interpreter state
this.r = [];
this.pc = 0x200;
this.i = 0;
this.dt = 0;
this.st = 0;
this.hires = false;
this.plane = 1;
// initialize control/debug state
this.keys = {};
this.waiting = false;
this.waitReg = -1;
this.halted = false;
this.breakpoint = false;
this.stack_breakpoint = -1;
this.metadata = rom;
this.tickCounter = 0;
this.profile_data = {};
}
this.writeCarry = function(dest, value, flag) {
this.v[dest] = (value & 0xFF);
this.v[0xF] = flag ? 1 : 0;
if (this.vfOrderQuirks) {
this.v[dest] = (value & 0xFF);
}
}
this.math = function(x, y, op) {
// basic arithmetic opcodes
switch(op) {
case 0x0: this.v[x] = this.v[y]; break;
case 0x1: this.v[x] |= this.v[y]; if (this.logicQuirks) this.v[0xF]=0; break;
case 0x2: this.v[x] &= this.v[y]; if (this.logicQuirks) this.v[0xF]=0; break;
case 0x3: this.v[x] ^= this.v[y]; if (this.logicQuirks) this.v[0xF]=0; break;
case 0x4:
var t = this.v[x]+this.v[y];
this.writeCarry(x, t, (t > 0xFF));
break;
case 0x5:
var t = this.v[x]-this.v[y];
this.writeCarry(x, t, (this.v[x] >= this.v[y]));
break;
case 0x7:
var t = this.v[y]-this.v[x];
this.writeCarry(x, t, (this.v[y] >= this.v[x]));
break;
case 0x6:
if (this.shiftQuirks) { y = x; }
var t = this.v[y] >> 1;
this.writeCarry(x, t, (this.v[y] & 0x1));
break;
case 0xE:
if (this.shiftQuirks) { y = x; }
var t = this.v[y] << 1;
this.writeCarry(x, t, ((this.v[y] >> 7) & 0x1));
break;
default:
haltBreakpoint("unknown math opcode "+op);
}
}
this.misc = function(x, rest) {
// miscellaneous opcodes
switch(rest) {
case 0x01:
this.plane = (x & 0x3);
break;
case 0x02:
for(var z = 0; z < 16; z++) {
this.pattern[z] = this.m[this.i+z];
}
break;
case 0x07: this.v[x] = this.dt; break;
case 0x0A: this.waiting = true; this.waitReg = x; break;
case 0x15: this.dt = this.v[x]; break;
case 0x18: this.buzzTrigger(this.v[x], this.st); this.st = this.v[x]; break;
case 0x1E: this.i = (this.i + this.v[x])&0xFFFF; break;
case 0x29: this.i = ((this.v[x] & 0xF) * 5); break;
case 0x30: this.i = ((this.v[x] & 0xF) * 10 + fontsets[this.fontStyle].small.length); break;
case 0x33:
this.m[this.i] = Math.floor(this.v[x]/100)%10;
this.m[this.i+1] = Math.floor(this.v[x]/10)%10;
this.m[this.i+2] = this.v[x]%10;
break;
case 0x55:
for(var z = 0; z <= x; z++) { this.m[this.i+z] = this.v[z]; }
if (!this.loadStoreQuirks) { this.i = (this.i+x+1)&0xFFFF; }
break;
case 0x65:
for(var z = 0; z <= x; z++) { this.v[z] = this.m[this.i+z]; }
if (!this.loadStoreQuirks) { this.i = (this.i+x+1)&0xFFFF; }
break;
case 0x75:
for(var z = 0; z <= x; z++) { this.flags[z] = this.v[z]; }
this.exportFlags(this.flags);
break;
case 0x85:
this.flags = this.importFlags();
if (typeof this.flags == "undefined" || this.flags == null) {
this.flags = [0, 0, 0, 0, 0, 0, 0, 0];
}
for(var z = 0; z <= x; z++) { this.v[z] = this.flags[z]; }
break;
default:
haltBreakpoint("unknown misc opcode "+rest);
}
}
this.sprite = function sprite(x, y, len) {
this.v[0xF] = 0x0;
var rowSize = this.hires ? 128 : 64;
var colSize = this.hires ? 64 : 32;
var i = this.i;
for(var layer = 0; layer < 2; layer++) {
if ((this.plane & (layer+1)) == 0) { continue; }
if (len == 0) {
// draw a SuperChip 16x16 sprite
for(var a = 0; a < 16; a++) {
for(var b = 0; b < 16; b++) {
var target = ((x+b) % rowSize) + ((y+a) % colSize)*rowSize;
var source = ((this.m[i+(a*2)+(b > 7 ? 1:0)] >> (7-(b%8))) & 0x1) != 0;
if (this.clipQuirks) {
if ((x%rowSize)+b>=rowSize || (y%colSize)+a>=colSize) { source = 0; }
}
if (!source) { continue; }
if (this.p[layer][target]) { this.p[layer][target] = 0; this.v[0xF] = 0x1; }
else { this.p[layer][target] = 1; }
}
}
i += 32;
}
else {
// draw a Chip8 8xN sprite
for(var a = 0; a < len; a++) {
for(var b = 0; b < 8; b++) {
var target = ((x+b) % rowSize) + ((y+a) % colSize)*rowSize;
var source = ((this.m[i+a] >> (7-b)) & 0x1) != 0;
if (this.clipQuirks) {
if ((x%rowSize)+b>=rowSize || (y%colSize)+a>=colSize) { source = 0; }
}
if (!source) { continue; }
if (this.p[layer][target]) { this.p[layer][target] = 0; this.v[0xF] = 0x1; }
else { this.p[layer][target] = 1; }
}
}
i += len;
}
}
}
this.call = function(nnn) {
if (this.r.length >= 12) {
haltBreakpoint("call stack overflow.");
}
this.r.push(this.pc);
this.pc = nnn
}
this.jump0 = function(nnn) {
if (this.jumpQuirks) { this.pc = nnn + this.v[(nnn >> 8)&0xF]; }
else { this.pc = nnn + this.v[0]; }
}
this.machine = function(nnn) {
if (nnn == 0x000) { this.halted = true; return; }
haltBreakpoint("machine code is not supported.");
}
this.skip = function() {
var op = (this.m[this.pc ] << 8) | this.m[this.pc+1];
this.pc += (op == 0xF000) ? 4 : 2;
}
this.opcode = function() {
// Increment profilining data
this.profile_data[this.pc] = (this.profile_data[this.pc] || 0) + 1;
// decode the current opcode
var op = (this.m[this.pc ] << 8) | this.m[this.pc+1];
var o = (this.m[this.pc ] >> 4) & 0x00F;
var x = (this.m[this.pc ] ) & 0x00F;
var y = (this.m[this.pc+1] >> 4) & 0x00F;
var n = (this.m[this.pc+1] ) & 0x00F;
var nn = (this.m[this.pc+1] ) & 0x0FF;
var nnn = op & 0xFFF;
this.pc += 2;
// execute a simple opcode
if (op == 0x00E0) {
// clear
for(var layer = 0; layer < 2; layer++) {
if ((this.plane & (layer+1)) == 0) { continue; }
for(var z = 0; z < this.p[layer].length; z++) {
this.p[layer][z] = 0;
}
}
return;
}
if (op == 0x00EE) {
// return
this.pc = this.r.pop();
return;
}
if ((op & 0xF0FF) == 0xE09E) {
// if -key
if (Object.keys(keymap[this.v[x]]||{}).some(x => x in this.keys)) { this.skip(); }
return;
}
if ((op & 0xF0FF) == 0xE0A1) {
// if key
if (!Object.keys(keymap[this.v[x]]||{}).some(x => x in this.keys)) { this.skip(); }
return;
}
if ((op & 0xFFF0) == 0x00C0) {
// scroll down n pixels
var rowSize = this.hires ? 128 : 64;
for(var layer = 0; layer < 2; layer++) {
if ((this.plane & (layer+1)) == 0) { continue; }
for(var z = this.p[layer].length - 1; z >= 0; z--) {
this.p[layer][z] = (z >= rowSize * n) ? this.p[layer][z - (rowSize * n)] : 0;
}
}
return;
}
if ((op & 0xFFF0) == 0x00D0) {
// scroll up n pixels
var rowSize = this.hires ? 128 : 64;
for(var layer = 0; layer < 2; layer++) {
if ((this.plane & (layer+1)) == 0) { continue; }
for(var z = 0; z < this.p[layer].length; z++) {
this.p[layer][z] = (z < (this.p[layer].length - rowSize * n)) ? this.p[layer][z + (rowSize * n)] : 0;
}
}
return;
}
if (op == 0x00FB) {
// scroll right 4 pixels
var rowSize = this.hires ? 128 : 64;
for(var layer = 0; layer < 2; layer++) {
if ((this.plane & (layer+1)) == 0) { continue; }
for(var a = 0; a < this.p[layer].length; a += rowSize) {
for(var b = rowSize-1; b >= 0; b--) {
this.p[layer][a + b] = (b > 3) ? this.p[layer][a + b - 4] : 0;
}
}
}
return;
}
if (op == 0x00FC) {
// scroll left 4 pixels
var rowSize = this.hires ? 128 : 64;
for(var layer = 0; layer < 2; layer++) {
if ((this.plane & (layer+1)) == 0) { continue; }
for(var a = 0; a < this.p[layer].length; a += rowSize) {
for(var b = 0; b < rowSize; b++) {
this.p[layer][a + b] = (b < rowSize - 4) ? this.p[layer][a + b + 4] : 0;
}
}
}
return;
}
if (op == 0x00FD) {
// exit
this.halted = true;
this.exitVector();
return;
}
if (op == 0x00FE) {
// lores
this.hires = false;
this.p = [[], []];
for(var z = 0; z < 32*64; z++) { this.p[0][z] = 0; this.p[1][z] = 0; }
return;
}
if (op == 0x00FF) {
// hires
this.hires = true;
this.p = [[], []];
for(var z = 0; z < 64*128; z++) { this.p[0][z] = 0; this.p[1][z] = 0; }
return;
}
if (op == 0xF000) {
// long memory reference
this.i = ((this.m[this.pc] << 8) | (this.m[this.pc+1])) & 0xFFFF;
this.pc += 2;
return;
}
if (o == 0x5 && n != 0) {
if (n == 2) {
// save range
var dist = Math.abs(x - y);
if (x < y) { for(var z = 0; z <= dist; z++) { this.m[this.i+z] = this.v[x+z]; }}
else { for(var z = 0; z <= dist; z++) { this.m[this.i+z] = this.v[x-z]; }}
return;
}
else if (n == 3) {
// load range
var dist = Math.abs(x - y);
if (x < y) { for(var z = 0; z <= dist; z++) { this.v[x+z] = this.m[this.i+z]; }}
else { for(var z = 0; z <= dist; z++) { this.v[x-z] = this.m[this.i+z]; }}
return;
}
else {
haltBreakpoint("unknown opcode "+op);
}
}
if (o == 0x9 && n != 0) {
haltBreakpoint("unknown opcode "+op);
}
// dispatch complex opcodes
switch(o) {
case 0x0: this.machine(nnn); break;
case 0x1: this.pc = nnn; break;
case 0x2: this.call(nnn); break;
case 0x3: if (this.v[x] == nn) { this.skip(); } break;
case 0x4: if (this.v[x] != nn) { this.skip(); } break;
case 0x5: if (this.v[x] == this.v[y]) { this.skip(); } break;
case 0x6: this.v[x] = nn; break;
case 0x7: this.v[x] = (this.v[x] + nn) & 0xFF; break;
case 0x8: this.math(x, y, n); break;
case 0x9: if (this.v[x] != this.v[y]) { this.skip(); } break;
case 0xA: this.i = nnn; break;
case 0xB: this.jump0(nnn); break;
case 0xC: this.v[x] = (Math.random()*256)&nn; break;
case 0xD: this.sprite(this.v[x], this.v[y], n); break;
case 0xF: this.misc(x, nn); break;
default: haltBreakpoint("unknown opcode "+o);
}
}
this.tick = function() {
if (this.halted) { return; }
this.tickCounter++;
try {
this.opcode();
}
catch(err) {
console.log("halted: " + err);
this.halted = true;
}
}
}
</script>
<script>"use strict";
////////////////////////////////////
//
// Emulator Execution
//
////////////////////////////////////
//must be set > 0
var scaleFactor = 5;
//dom id for canvas element
var renderTarget = "target";
const optionFlags = [
"tickrate",
"fillColor",
"fillColor2",
"blendColor",
"backgroundColor",
"buzzColor",
"quietColor",
"shiftQuirks",
"loadStoreQuirks",
"vfOrderQuirks",
"clipQuirks",
"vBlankQuirks",
"jumpQuirks",
"screenRotation",
"maxSize",
"touchInputMode",
"logicQuirks",
"fontStyle",
]
function unpackOptions(emulator, options) {
optionFlags.forEach(x => { if (x in options) emulator[x] = options[x] })
if (options["enableXO"]) emulator.maxSize = 65024 // legacy option
}
function packOptions(emulator) {
const r = {}
optionFlags.forEach(x => r[x] = emulator[x])
return r
}
function setRenderTarget(scale, canvas) {
scaleFactor = scale;
renderTarget = canvas;
var c = document.getElementById(canvas);
// Remove any existing previous delta frame so first frame is always drawn:
c.last = undefined;
var w = scaleFactor * 128;
var h = scaleFactor * 64;
if (emulator.screenRotation == 90 || emulator.screenRotation == 270) {
c.width = h;
c.height = w;
}
else {
c.width = w;
c.height = h;
}
}
function setTransform(emulator, g) {
g.setTransform(1, 0, 0, 1, 0, 0);
var x = scaleFactor * 128;
var y = scaleFactor * 64;
switch(emulator.screenRotation) {
case 90:
g.rotate(0.5 * Math.PI);
g.translate(0, -y);
break;
case 180:
g.rotate(1.0 * Math.PI);
g.translate(-x, -y);
break;
case 270:
g.rotate(1.5 * Math.PI);
g.translate(-x, 0);
break;
default:
console.assert(emulator.screenRotation === 0, 'Screen rotation not set to 0, 90, 180, or 270. Treating as 0.')
}
}
function arrayEqual(a, b) {
var length = a.length;
if (length !== b.length) { return false; }
for (var i = 0; i < length; i++) {
if (a[i] !== b[i]) { return false; }
}
return true;
}
function getColor(id) {
switch(id) {
case 0: return emulator.backgroundColor;
case 1: return emulator.fillColor;
case 2: return emulator.fillColor2;
case 3: return emulator.blendColor;
}
throw "invalid color: " + id;
}
function renderDisplay(emulator) {
var c = document.getElementById(renderTarget);
// Canvas rendering can be expensive. Exit out early if nothing has changed.
var colors = [emulator.backgroundColor, emulator.fillColor, emulator.fillColor2, emulator.blendColor];
if (c.last !== undefined) {
if (arrayEqual(c.last.p[0], emulator.p[0]) && arrayEqual(c.last.p[1], emulator.p[1])
&& arrayEqual(c.last.colors, colors)) {
return;
}
if (c.last.hires !== emulator.hires)
c.last = undefined; // full redraw when switching resolution
}
var g = c.getContext("2d");
setTransform(emulator, g);
var w = emulator.hires ? 128 : 64;
var h = emulator.hires ? 64 : 32;
var size = emulator.hires ? scaleFactor : scaleFactor*2;
var lastPixels = c.last !== undefined? c.last.p: [[], []]
g.scale(size, size)
var z = 0;
for(var y = 0; y < h; ++y) {
for(var x = 0; x < w; ++x, ++z) {
var oldColorIdx = lastPixels[0][z] + (lastPixels[1][z] << 1);
var colorIdx = emulator.p[0][z] + (emulator.p[1][z] << 1);
if (oldColorIdx !== colorIdx) {
g.fillStyle = getColor(colorIdx);
g.fillRect(x, y, 1, 1);
}
}
}
g.scale(1, 1) //restore scale to 1,1 just in case
c.last = {
colors: colors,
p: [emulator.p[0].slice(), emulator.p[1].slice()],
hires: emulator.hires,
};
}
////////////////////////////////////
//
// Audio Playback
//
////////////////////////////////////
var audio;
var audioNode;
var audioSource;
var audioData;
var AudioBuffer = function(buffer, duration) {
if (!(this instanceof AudioBuffer)) {
return new AudioBuffer(buffer, duration);
}
this.pointer = 0;
this.buffer = buffer;
this.duration = duration;
}
AudioBuffer.prototype.write = function(buffer, index, size) {
size = Math.max(0, Math.min(size, this.duration))
if (!size) { return size; }
this.duration -= size;
var bufferSize = this.buffer.length;
var end = index + size;
for(var i = index; i < end; ++i) {
buffer[i] = this.buffer[this.pointer++];
this.pointer %= bufferSize;
}
return size;
}
AudioBuffer.prototype.dequeue = function(duration) {
this.duration -= duration;
}
var FREQ = 4000;
var TIMER_FREQ = 60;
var SAMPLES = 16;
var BUFFER_SIZE = SAMPLES * 8
function audioEnable() {
// this will only work if called directly from a user-generated input handler:
if (audio && audio.state == 'suspended') audio.resume()
}
function audioSetup() {
if (!audio) {
if (typeof AudioContext !== 'undefined') {
audio = new AudioContext();
}
else if (typeof webkitAudioContext !== 'undefined') {
audio = new webkitAudioContext();
}
}
audioEnable()
if (audio && !audioNode) {
audioNode = audio.createScriptProcessor(4096, 1, 1);
audioNode.onaudioprocess = function(audioProcessingEvent) {
var outputBuffer = audioProcessingEvent.outputBuffer;
var outputData = outputBuffer.getChannelData(0);
var samples_n = outputBuffer.length;
var index = 0;
while(audioData.length && index < samples_n) {
var size = samples_n - index;
var written = audioData[0].write(outputData, index, size);
index += written;
if (written < size) {
audioData.shift();
}
}
while(index < samples_n) {
outputData[index++] = 0;
}
//the last one can be long sound with high value of buzzer, so always keep it
if (audioData.length > 1) {
var audioDataSize = 0;
var audioBufferSize = audioNode.bufferSize;
audioData.forEach(function(buffer) { audioDataSize += buffer.duration; })
while(audioDataSize > audioBufferSize && audioData.length > 1) {
audioDataSize -= audioData.shift().duration;
}
}
}
audioData = [];
audioNode.connect(audio.destination);
return true;
}
if (audio && audioNode) { return true; }
return false;
}
function stopAudio() {
if (!audio) { return; }
if (audioNode) {
audioNode.disconnect();
audioNode = null;
}
audioData = [];
}
var VOLUME = 0.25;
function playPattern(soundLength, buffer, remainingTicks) {
if (!audio) { return; }
audioEnable()
var samples = Math.floor(BUFFER_SIZE * audio.sampleRate / FREQ);
var audioBuffer = new Array(samples);
if (remainingTicks && audioData.length > 0) {
audioData[audioData.length - 1].dequeue(Math.floor(remainingTicks * audio.sampleRate / TIMER_FREQ));
}
for(var i = 0; i < samples; ++i) {
var srcIndex = Math.floor(i * FREQ / audio.sampleRate);
var cell = srcIndex >> 3;
var bit = srcIndex & 7;
audioBuffer[i] = (buffer[srcIndex >> 3] & (0x80 >> bit)) ? VOLUME: 0;
}
audioData.push(new AudioBuffer(audioBuffer, Math.floor(soundLength * audio.sampleRate / TIMER_FREQ)));
}
function escapeHtml(str) {
var div = document.createElement('div');
div.appendChild(document.createTextNode(str));
return div.innerHTML;
}
</script>
<script>/**
* Adaptive Input
**/
const ael = (element, event, listener) => element.addEventListener (event, listener, { passive:false })
const rel = (element, event, listener) => element.removeEventListener(event, listener, { passive:false })
const pd = event => (event.preventDefault(),event.stopPropagation())
const VIP_HEX = '123c456d789ea0bf'.split('')
const VIP_KEYS = VIP_HEX.map(x => parseInt(x,16))
const GAMEPAD_STYLES = `
.gamepad{
position:absolute;
top:10%;
left:0px;
width:100%;
height:90%;
opacity:0.3;
user-select: none;
-webkit-user-select: none;
}
.gamepad .dpad{
position:absolute;
bottom: 50px;
left: 50px;
width: 250px;
height: 250px;
background: gray;
border-radius: 50%;
overflow:hidden;
}
.gamepad .stick{
display:none;
position:absolute;
border-radius: 50%;
width:100px;
height:100px;
margin-left:-50px;
margin-top:-50px;
}
.gamepad .buttons{
position:absolute;
bottom: 50px;
right: 50px;
width: 250px;
height: 250px;
}
.gamepad .gamebutton{
position:absolute;
width: 125px;
height: 125px;
background:gray;
border-radius:50%;
overflow:hidden;
line-height: 125px;
font-size:50px;
font-weight:bold;
color:darkgray;
text-align:center;
}
.gamepad .dpad.active .stick {display:block;background:#444}
.gamepad .gamebutton.active{background:#444;}
.gamepad .gamebutton.b{left:0;bottom:0;}
.gamepad .gamebutton.a{right:0;top:0;}
`
const VIP_STYLES = `
.vip-pad {display:flex;flex-direction:column;align-items:center;z-index:2000;}
.vip-pad .keypad {display:flex;flex-direction:column;margin-top:10px;}
.vip-pad .keypad>div {display:flex;flex-direction:row;}
.vip-pad .keypad>div>div {
-webkit-user-select: none;
user-select: none;
background:gray;
width: 100px;
height: 51px;
display: flex;
justify-content: center;
align-items: center;
margin: 1px;
}
.vip-pad .keypad>div>div:active,