mirror of
https://github.com/sehugg/8bitworkshop.git
synced 2024-06-11 12:29:29 +00:00
623 lines
16 KiB
JavaScript
623 lines
16 KiB
JavaScript
"use strict";
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// http://www.computerarcheology.com/Arcade/Asteroids/DVG.html
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// http://arcarc.xmission.com/Tech/neilw_xy.txt
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var VECTOR_PRESETS = [
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]
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var ASTEROIDS_KEYCODE_MAP = makeKeycodeMap([
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[Keys.VK_SHIFT, 3, 0xff],
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[Keys.VK_SPACE, 4, 0xff],
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[Keys.VK_5, 8, 0xff],
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[Keys.VK_6, 9, 0xff],
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[Keys.VK_7, 10, 0xff],
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[Keys.VK_1, 11, 0xff],
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[Keys.VK_2, 12, 0xff],
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[Keys.VK_UP, 13, 0xff],
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[Keys.VK_RIGHT, 14, 0xff],
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[Keys.VK_LEFT, 15, 0xff],
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]);
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var GRAVITAR_KEYCODE_MAP = makeKeycodeMap([
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[Keys.VK_SHIFT, 1, -0x1],
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[Keys.VK_SPACE, 1, -0x2],
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[Keys.VK_5, 0, 0x2],
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[Keys.VK_6, 0, 0x1],
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[Keys.VK_1, 2, 0x20],
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[Keys.VK_2, 2, 0x40],
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[Keys.VK_UP, 1, -0x10],
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[Keys.VK_RIGHT, 1, -0x4],
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[Keys.VK_LEFT, 1, -0x8],
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]);
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var AtariVectorPlatform = function(mainElement) {
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var self = this;
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var cpuFrequency = 1500000.0;
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var cpuCyclesPerNMI = 6000;
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var cpuCyclesPerFrame = Math.round(cpuFrequency/60);
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var cpu, cpuram, dvgram, rom, vecrom, bus, dvg;
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var video, audio, timer;
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var clock;
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var switches = new RAM(16).mem;
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var nmicount = cpuCyclesPerNMI;
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this.__proto__ = new Base6502Platform();
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this.getPresets = function() {
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return VECTOR_PRESETS;
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}
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this.start = function() {
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cpuram = new RAM(0x400);
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dvgram = new RAM(0x2000);
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//switches[5] = 0xff;
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//switches[7] = 0xff;
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// bus
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bus = {
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read: new AddressDecoder([
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[0x0, 0x3ff, 0x3ff, function(a) { return cpuram.mem[a]; }],
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[0x2001, 0x2001, 0, function(a) { return ((clock/500) & 1) ? 0xff : 0x00; }],
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[0x2000, 0x2007, 0x7, function(a) { return switches[a]; }],
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[0x2400, 0x2407, 0x7, function(a) { return switches[a+8]; }],
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[0x4000, 0x4fff, 0xfff, function(a) { return dvgram.mem[a]; }],
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[0x5000, 0x5fff, 0xfff, function(a) { return vecrom[a]; }],
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[0x6800, 0x7fff, 0, function(a) { return rom[a - 0x6800]; }],
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], {gmask:0x7fff}),
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write: new AddressDecoder([
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[0x0, 0x3ff, 0x3ff, function(a,v) { cpuram.mem[a] = v; }],
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[0x3000, 0x3000, 0, function(a,v) { dvg.runUntilHalt(0); }],
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// TODO: draw asynchronous or allow poll of HALT ($2002)
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[0x4000, 0x5fff, 0x1fff, function(a,v) { dvgram.mem[a] = v; }],
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], {gmask:0x7fff})
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};
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cpu = self.newCPU(bus);
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// create video/audio
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video = new VectorVideo(mainElement,1024,1024);
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dvg = new DVGBWStateMachine(bus, video, 0x4000);
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audio = new SampleAudio(cpuFrequency);
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video.create();
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timer = new AnimationTimer(60, function() {
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video.clear();
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var debugCond = self.getDebugCallback();
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clock = 0;
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for (var i=0; i<cpuCyclesPerFrame; i++) {
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if (debugCond && debugCond()) { debugCond = null; }
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clock++;
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if (--nmicount == 0) {
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//console.log("NMI", cpu.saveState());
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var n = cpu.setNMIAndWait();
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clock += n;
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nmicount = cpuCyclesPerNMI - n;
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//console.log(n, clock, nmicount);
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}
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cpu.clockPulse();
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//cpu.executeInstruction();
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}
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self.restartDebugState();
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});
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setKeyboardFromMap(video, switches, ASTEROIDS_KEYCODE_MAP);
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}
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this.loadROM = function(title, data) {
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if(data.length != 0x2000) {
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throw "ROM length must be == 0x2000";
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}
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rom = data.slice(0,0x1800);
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vecrom = data.slice(0x1800,0x2000);
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this.reset();
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}
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this.getRasterPosition = function() {
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return {x:0, y:0}; // TODO
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}
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this.isRunning = function() {
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return timer.isRunning();
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}
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this.pause = function() {
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timer.stop();
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}
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this.resume = function() {
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timer.start();
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}
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this.reset = function() {
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this.clearDebug();
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cpu.reset();
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}
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this.readAddress = function(addr) {
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return bus.read(addr);
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}
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this.loadState = function(state) {
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cpu.loadState(state.c);
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cpuram.mem.set(state.cb);
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dvgram.mem.set(state.db);
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nmicount = state.nmic;
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}
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this.saveState = function() {
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return {
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c:cpu.saveState(),
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cb:cpuram.mem.slice(0),
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db:dvgram.mem.slice(0),
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nmic:nmicount
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}
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}
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this.getCPUState = function() {
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return cpu.saveState();
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}
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}
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var AtariColorVectorPlatform = function(mainElement) {
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var self = this;
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var masterFrequency = 12096000.0;
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var cpuFrequency = masterFrequency / 8;
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var nmiFrequency = masterFrequency / 4096 / 12;
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var cpuCyclesPerNMI = Math.round(cpuFrequency / nmiFrequency);
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var cpuCyclesPerFrame = Math.round(cpuFrequency / 60);
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var cpu, cpuram, dvgram, rom, vecrom, bus, dvg, earom;
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var video, audio, timer;
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var clock;
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var switches = new RAM(16).mem;
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var nmicount = cpuCyclesPerNMI;
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var earom_offset, earom_data;
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this.__proto__ = new Base6502Platform();
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this.getPresets = function() {
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return VECTOR_PRESETS;
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}
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this.start = function() {
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cpuram = new RAM(0x800);
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dvgram = new RAM(0x2000);
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earom = new RAM(0x40);
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rom = padBytes(new lzgmini().decode(GRAVITAR_ROM).slice(0), 0x7000+1);
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vecrom = padBytes(new lzgmini().decode(GRAVITAR_VECROM).slice(0), 0x6000-0x2800+1);
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switches[0] = 0xff;
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switches[1] = 0xff;
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switches[2] = 0xff;
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// bus
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bus = {
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read: new AddressDecoder([
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[0x0, 0x7ff, 0x7ff, function(a) { return cpuram.mem[a]; }],
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[0x2000, 0x27ff, 0x7ff, function(a) { return dvgram.mem[a]; }],
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[0x2800, 0x5fff, 0x7fff, function(a) { return vecrom[a - 0x2800]; }],
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//[0x2001, 0x2001, 0, function(a) { return ((clock/500) & 1) ? 0xff : 0x00; }],
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//[0x6000, 0x67ff, 0x7ff, function(a) { /* pokey1 */ return 0; }],
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//[0x6800, 0x6fff, 0x7ff, function(a) { /* pokey2 */ return 0; }],
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[0x7800, 0x7800, 0, function(a) { return switches[0]; }],
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[0x8000, 0x8000, 0, function(a) { return switches[1]; }],
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[0x8800, 0x8800, 0, function(a) { return switches[2]; }],
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//[0x7000, 0x7000, 0, function(a) { /* EAROM read */ return 0; }],
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//[0x8940, 0x897f, 0x3f, function(a) { /* EAROM data */ return 0; }],
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[0x8900, 0x8900, 0, function(a) { /* EAROM read */ return earom_data; }],
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[0x9000, 0xffff, 0xffff, function(a) { return rom[a - 0x9000]; }],
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]),
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write: new AddressDecoder([
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[0x0, 0x7ff, 0x7ff, function(a,v) { cpuram.mem[a] = v; }],
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[0x2000, 0x27ff, 0x7ff, function(a,v) { dvgram.mem[a] = v; }],
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[0x6000, 0x67ff, 0x7ff, function(a,v) { /* pokey1 */ }],
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[0x6800, 0x6fff, 0x7ff, function(a,v) { /* pokey2 */ }],
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[0x8800, 0x8800, 0, function(a,v) { /* LEDs, etc */ }],
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[0x8840, 0x8840, 0, function(a,v) { dvg.runUntilHalt(0); }],
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[0x8880, 0x8880, 0, function(a,v) { dvg.reset(); }],
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[0x88c0, 0x88c0, 0, function(a,v) { /* IRQ ACK */ }],
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[0x8900, 0x8900, 0, function(a,v) { /* EAROM ctrl */
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if (v == 9) earom_data=earom.mem[earom_offset];
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if (v == 12) earom.mem[earom_offset]=earom_data;
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}],
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[0x8940, 0x897f, 0x3f, function(a,v) { /* EAROM data */ earom_offset = a; earom_data = v; }],
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[0x8980, 0x8980, 0, function(a,v) { /* TODO: watchdog */ }],
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// TODO: draw asynchronous or allow poll of HALT ($2002)
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//[0, 0xffff, 0, function(a,v) { console.log(hex(a,4),hex(v,2)); }],
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])
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};
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cpu = self.newCPU(bus);
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// create video/audio
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video = new VectorVideo(mainElement,1024,1024);
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dvg = new DVGColorStateMachine(bus, video, 0x2000);
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audio = new SampleAudio(cpuFrequency);
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video.create();
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timer = new AnimationTimer(60, function() {
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video.clear();
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var debugCond = self.getDebugCallback();
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clock = 0;
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for (var i=0; i<cpuCyclesPerFrame; i++) {
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if (debugCond && debugCond()) { debugCond = null; }
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clock++;
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if (--nmicount == 0) {
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//console.log("NMI", cpu.saveState());
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var n = cpu.setIRQAndWait(); // TODO: only if I flag set
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clock += n;
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nmicount = cpuCyclesPerNMI - n;
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//console.log(n, clock, nmicount);
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}
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cpu.clockPulse();
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//cpu.executeInstruction();
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}
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self.restartDebugState();
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});
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setKeyboardFromMap(video, switches, GRAVITAR_KEYCODE_MAP);
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}
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this.loadROM = function(title, data) {
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this.reset();
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}
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this.getRasterPosition = function() {
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return {x:0, y:0}; // TODO
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}
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this.isRunning = function() {
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return timer.isRunning();
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}
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this.pause = function() {
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timer.stop();
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}
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this.resume = function() {
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timer.start();
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}
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this.reset = function() {
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this.clearDebug();
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cpu.reset();
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}
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this.readAddress = function(addr) {
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return bus.read(addr);
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}
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this.loadState = function(state) {
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cpu.loadState(state.c);
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cpuram.mem.set(state.cb);
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dvgram.mem.set(state.db);
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nmicount = state.nmic;
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}
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this.saveState = function() {
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return {
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c:cpu.saveState(),
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cb:cpuram.mem.slice(0),
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db:dvgram.mem.slice(0),
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nmic:nmicount
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}
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}
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this.getCPUState = function() {
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return cpu.saveState();
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}
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}
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//
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var Z80ColorVectorPlatform = function(mainElement, proto) {
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var self = this;
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var cpuFrequency = 3000000.0;
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var cpuCyclesPerFrame = Math.round(cpuFrequency/60);
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var cpu, cpuram, dvgram, rom, bus, dvg;
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var video, audio, timer;
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var clock;
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var switches = new RAM(16).mem;
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this.__proto__ = new BaseZ80Platform();
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this.getPresets = function() {
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return VECTOR_PRESETS;
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}
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this.start = function() {
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cpuram = new RAM(0x2000);
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dvgram = new RAM(0x4000);
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// bus
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bus = {
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read: new AddressDecoder([
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[0x0, 0x7fff, 0, function(a) { return rom[a]; }],
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[0x8000, 0x800f, 0xf, function(a) { return switches[a]; }],
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[0xa000, 0xdfff, 0x3fff, function(a) { return dvgram.mem[a]; }],
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[0xe000, 0xffff, 0x1fff, function(a) { return cpuram.mem[a]; }],
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]),
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write: new AddressDecoder([
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[0x8840, 0x8840, 0, function(a,v) { dvg.runUntilHalt(0); }],
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[0x8880, 0x8880, 0, function(a,v) { dvg.reset(); }],
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[0xa000, 0xdfff, 0x3fff, function(a,v) { dvgram.mem[a] = v; }],
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[0xe000, 0xffff, 0x1fff, function(a,v) { cpuram.mem[a] = v; }],
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])
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};
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cpu = self.newCPU(bus);
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// create video/audio
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video = new VectorVideo(mainElement,1024,1024);
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dvg = new DVGColorStateMachine(bus, video, 0xa000);
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audio = new SampleAudio(cpuFrequency);
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video.create();
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timer = new AnimationTimer(60, function() {
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video.clear();
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self.runCPU(cpu, cpuCyclesPerFrame);
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cpu.requestInterrupt();
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self.restartDebugState();
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});
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setKeyboardFromMap(video, switches, ASTEROIDS_KEYCODE_MAP);
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}
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this.loadROM = function(title, data) {
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rom = padBytes(data, 0x8000);
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this.reset();
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}
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this.getRasterPosition = function() {
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return {x:0, y:0}; // TODO
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}
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this.isRunning = function() {
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return timer.isRunning();
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}
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this.pause = function() {
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timer.stop();
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}
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this.resume = function() {
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timer.start();
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}
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this.reset = function() {
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cpu.reset();
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}
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this.readAddress = function(addr) {
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return bus.read(addr);
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}
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this.loadState = function(state) {
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cpu.loadState(state.c);
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cpuram.mem.set(state.db);
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dvgram.mem.set(state.db);
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}
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this.saveState = function() {
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return {
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c:cpu.saveState(),
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cb:cpuram.mem.slice(0),
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db:dvgram.mem.slice(0),
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}
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}
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this.getCPUState = function() {
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return cpu.saveState();
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}
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}
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// DIGITAL VIDEO GENERATOR
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var DVGBWStateMachine = function(bus, video, bofs) {
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var self = this;
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var pc = 0;
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var x = 0;
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var y = 0;
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var gsc = 0;
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var pcstack = [];
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var running = false;
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bofs &= 0xffff;
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function readWord(a) {
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a &= 0xfff;
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return bus.read(a*2+bofs) + (bus.read(a*2+bofs+1) << 8);
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}
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function decodeSigned(w, o2) {
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var s = w & (1<<o2);
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w = w & ((1<<o2)-1);
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if (s)
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return -w;
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else
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return w;
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}
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this.reset = function() {
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pc = 0;
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gsc = 7;
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running = false;
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}
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this.go = function() {
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this.reset();
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running = true;
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}
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this.runUntilHalt = function(startpc) {
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this.go();
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pc = startpc;
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for (var i=0; i<10000; i++) { // TODO: limit execution
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if (!running) break;
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this.nextInstruction();
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}
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//console.log('DVG',i);
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}
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var GSCALES = [7, 6, 5, 4, 3, 2, 1, 0, 15, 14, 13, 12, 11, 10, 9, 8];
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this.nextInstruction = function() {
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if (!running) return;
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var w = readWord(pc);
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var op = w >> 12;
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//console.log(hex(pc), hex(w));
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pc++;
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switch (op) {
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// VEC
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case 0:
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case 1:
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case 2:
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case 3:
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case 4:
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case 5:
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case 6:
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case 7:
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case 8:
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case 9: { // VCTR
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var sc = gsc + 9 - op;
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var w2 = readWord(pc++);
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var z = w2 >> 12;
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var x2 = x + ((decodeSigned(w2, 10) << 7) >> sc);
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var y2 = y + ((decodeSigned(w, 10) << 7) >> sc);
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video.drawLine(x, y, x2, y2, z, 255);
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//console.log(pc.toString(16), w.toString(16), w2.toString(16), gsc, sc, x, y, x2, y2);
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x = x2;
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y = y2;
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break;
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}
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case 10: { // LABS
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var w2 = readWord(pc++);
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gsc = GSCALES[w2 >> 12];
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x = w2 & 0x3ff;
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y = w & 0x3ff;
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break;
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}
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case 11: // HALT
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running = false;
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break;
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case 13: // RTSL
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pc = pcstack.pop();
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break;
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case 12: // JSRL
|
|
pcstack.push(pc);
|
|
case 14: // JMPL
|
|
pc = w & 0xfff;
|
|
break;
|
|
case 15: { // SVEC
|
|
var sc = ((w>>11)&1) + ((w>>2)&2);
|
|
sc = gsc - sc - 1;
|
|
var x2 = x + ((decodeSigned(w, 2) << 7) >> sc);
|
|
var y2 = y + ((decodeSigned(w>>8, 2) << 7) >> sc);
|
|
var z = (w >> 4) & 0xf;
|
|
video.drawLine(x, y, x2, y2, z, 255);
|
|
x = x2;
|
|
y = y2;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
var DVGColorStateMachine = function(bus, video, bofs) {
|
|
var self = this;
|
|
var pc = 0;
|
|
var x = 0;
|
|
var y = 0;
|
|
var scale = 1.0;
|
|
var color;
|
|
var statz;
|
|
var pcstack = [];
|
|
var running = false;
|
|
bofs &= 0xffff;
|
|
|
|
function readWord(a) {
|
|
a &= 0x1fff;
|
|
return bus.read(a*2+bofs) + (bus.read(a*2+bofs+1) << 8);
|
|
}
|
|
|
|
// twos complement
|
|
function decodeSigned(w, o2) {
|
|
var s = w & (1<<o2);
|
|
w = w & ((1<<o2)-1);
|
|
if (s)
|
|
return w-(1<<o2);
|
|
else
|
|
return w;
|
|
}
|
|
|
|
this.reset = function() {
|
|
pc = 0;
|
|
scale = 1.0;
|
|
color = 7;
|
|
statz = 15;
|
|
x = 512;
|
|
y = 512;
|
|
running = false;
|
|
}
|
|
|
|
this.go = function() {
|
|
this.reset();
|
|
running = true;
|
|
}
|
|
|
|
this.runUntilHalt = function(startpc) {
|
|
this.go();
|
|
pc = startpc;
|
|
for (var i=0; i<10000; i++) { // TODO: limit execution
|
|
if (!running) break;
|
|
this.nextInstruction();
|
|
}
|
|
//console.log('DVG',i);
|
|
}
|
|
|
|
this.nextInstruction = function() {
|
|
if (!running) return;
|
|
var w = readWord(pc);
|
|
var op = w >> 13;
|
|
//video.drawLine(pc, 1023, pc+1, 1023-op, 7);
|
|
//console.log(hex(pc), hex(w), op);
|
|
pc++;
|
|
switch (op) {
|
|
case 0: { // VCTR
|
|
var w2 = readWord(pc++);
|
|
var z = w2 >> 13;
|
|
if (z == 2) z = statz;
|
|
var x2 = x + Math.round(decodeSigned(w2, 12) * scale);
|
|
var y2 = y + Math.round(decodeSigned(w, 12) * scale);
|
|
video.drawLine(x, y, x2, y2, z<<4, color);
|
|
x = x2;
|
|
y = y2;
|
|
break;
|
|
}
|
|
case 1: // HALT
|
|
running = false;
|
|
break;
|
|
case 2: { // SVEC
|
|
var x2 = x + Math.round(decodeSigned(w, 4) * scale * 2);
|
|
var y2 = y + Math.round(decodeSigned(w>>8, 4) * scale * 2);
|
|
var z = (w >> 5) & 0x7;
|
|
if (z == 2) z = statz;
|
|
video.drawLine(x, y, x2, y2, z<<4, color);
|
|
x = x2;
|
|
y = y2;
|
|
break;
|
|
}
|
|
case 3: { // STAT/SCAL
|
|
if (w & 0x1000) {
|
|
var b = ((w >> 8) & 0x07)+8;
|
|
var l = (~w) & 0xff;
|
|
scale = ((l << 16) >> b) / 32768.0;
|
|
} else {
|
|
color = w & 7;
|
|
statz = (w >> 4) & 0xf;
|
|
}
|
|
break;
|
|
}
|
|
case 4: // CNTR
|
|
x = 512;
|
|
y = 512;
|
|
break;
|
|
case 6: // RTSL
|
|
if (pcstack.length == 0) {
|
|
//console.log("stack underflow"); // TODO: error?
|
|
} else {
|
|
pc = pcstack.pop();
|
|
}
|
|
break;
|
|
case 5: // JSRL
|
|
pcstack.push(pc);
|
|
case 7: // JMPL
|
|
if (pc == 0)
|
|
running = false;
|
|
else
|
|
pc = w & 0x1fff;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
//
|
|
|
|
PLATFORMS['vector-ataribw'] = AtariVectorPlatform;
|
|
PLATFORMS['vector-ataricolor'] = AtariColorVectorPlatform;
|
|
PLATFORMS['vector-z80color'] = Z80ColorVectorPlatform;
|