145 lines
3.8 KiB
JavaScript
145 lines
3.8 KiB
JavaScript
"use strict";
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var KONAMISOUND_PRESETS = [
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];
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var KonamiSoundPlatform = function(mainElement) {
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var self = this;
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this.__proto__ = new BaseZ80Platform();
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var cpu, ram, rom, membus, iobus;
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var audio, master;
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var video, timer;
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var interruptPending = 0;
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var psgRegister = 0;
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var psg;
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var cpuFrequency = 14318000/8;
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var ioTimerFrequency = 1789750 / 1280;
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var cpuCyclesPerFrame = cpuFrequency/60;
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var cpuCyclesPerTimer = cpuFrequency/ioTimerFrequency;
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this.getPresets = function() {
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return KONAMISOUND_PRESETS;
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}
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this.start = function() {
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ram = new RAM(0x400);
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membus = {
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read: new AddressDecoder([
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[0x0000, 0x3fff, 0x3fff, function(a) { return rom ? rom[a] : null; }],
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[0x4000, 0x5fff, 0x3ff, function(a) { return ram.mem[a]; }]
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]),
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write: new AddressDecoder([
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[0x4000, 0x5fff, 0x3ff, function(a,v) { ram.mem[a] = v; }],
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]),
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isContended: function() { return false; },
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};
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iobus = {
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read: function(addr) {
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if (addr & 0x40) {
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if (psgRegister == 0xf) { // timer
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var bit = (cpu.getTstates() / cpuCyclesPerTimer) & 1;
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return bit ? 0xff : 0x00; // 0x00, 0x10, 0x20, 0x30, 0x40, 0x90, 0xa0, 0xb0, 0xa0, 0xd0
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}
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return psg.readRegister(psgRegister) & 0xff;
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}
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return 0;
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},
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write: function(addr, val) {
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if (addr & 0x80) {
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psgRegister = val & 0xf;
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//console.log('PSG reg', psgRegister);
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}
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if (addr & 0x40) {
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psg.writeRegisterAY(psgRegister, val & 0xff);
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//console.log('PSG write', psgRegister, val);
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}
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}
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};
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cpu = window.Z80({
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display: {},
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memory: membus,
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ioBus: iobus
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});
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psg = new PsgDeviceChannel();
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master = new MasterChannel();
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psg.setMode(PsgDeviceChannel.MODE_SIGNED);
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psg.setDevice(PsgDeviceChannel.DEVICE_AY_3_8910);
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master.addChannel(psg);
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audio = new AudioLooper(512);
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audio.setChannel(master);
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//audio = new SampleAudio(psg.sampleRate);
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video = new RasterVideo(mainElement,256,256);
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video.create();
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video.setKeyboardEvents(function(key,code,flags) {
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var intr = (key-49);
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if (intr >= 0 && (flags & 1)) {
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psg.writeRegister(14, intr);
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psg.writeRegister(15, 0x80);
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cpu.setIFF1(1);
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cpu.requestInterrupt(0x38);
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/*
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console.log(cpu.saveState());
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console.log(hex(intr * 8), cpu.getIFF1(), cpu.getIM());
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cpu.runFrame(cpu.getTstates() + 1);
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console.log(cpu.saveState());
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*/
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}
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});
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timer = new AnimationTimer(60, function() {
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if (!self.isRunning())
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return;
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var debugCond = self.getDebugCallback();
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var targetTstates = cpu.getTstates() + cpuCyclesPerFrame;
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if (debugCond) {
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while (cpu.getTstates() < targetTstates) {
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if (debugCond && debugCond()) { debugCond = null; }
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cpu.runFrame(cpu.getTstates() + 1);
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}
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} else {
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cpu.runFrame(targetTstates);
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}
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});
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}
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this.loadROM = function(title, data) {
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rom = padBytes(data, 0x4000);
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cpu.reset();
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}
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this.loadState = function(state) {
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cpu.loadState(state.c);
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ram.mem.set(state.b);
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}
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this.saveState = function() {
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return {
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c:self.getCPUState(),
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b:ram.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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this.isRunning = function() {
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return timer && timer.isRunning();
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}
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this.pause = function() {
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timer.stop();
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//audio.stop();
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}
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this.resume = function() {
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timer.start();
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audio.activate();
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}
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this.reset = function() {
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cpu.reset();
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if (!this.getDebugCallback()) cpu.setTstates(0); // TODO?
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}
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this.readAddress = function(addr) {
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return membus.read(addr); // TODO?
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}
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}
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PLATFORMS['sound_konami'] = KonamiSoundPlatform;
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