mirror of
https://github.com/sehugg/8bitworkshop.git
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108 lines
3.8 KiB
JavaScript
108 lines
3.8 KiB
JavaScript
"use strict";
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Object.defineProperty(exports, "__esModule", { value: true });
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exports.WilliamsSoundPlatform = void 0;
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const ZilogZ80_1 = require("../common/cpu/ZilogZ80");
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const devices_1 = require("../common/devices");
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const baseplatform_1 = require("../common/baseplatform");
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const emu_1 = require("../common/emu");
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var WILLIAMS_SOUND_PRESETS = [
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{ id: 'swave.c', name: 'Wavetable Synth' },
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];
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/****************************************************************************
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Midway/Williams Audio Boards
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----------------------------
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6809 MEMORY MAP
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Function Address R/W Data
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---------------------------------------------------------------
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Program RAM 0000-07FF R/W D0-D7
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Music (YM-2151) 2000-2001 R/W D0-D7
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6821 PIA 4000-4003 R/W D0-D7
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HC55516 clock low, digit latch 6000 W D0
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HC55516 clock high 6800 W xx
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Bank select 7800 W D0-D2
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Banked Program ROM 8000-FFFF R D0-D7
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****************************************************************************/
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class WilliamsSound extends devices_1.BasicMachine {
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constructor() {
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super();
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this.cpuFrequency = 18432000 / 6; // 3.072 MHz
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this.cpuCyclesPerFrame = this.cpuFrequency / 60;
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this.cpuAudioFactor = 32;
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this.canvasWidth = 256;
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this.numVisibleScanlines = 256;
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this.defaultROMSize = 0x4000;
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this.sampleRate = this.cpuFrequency;
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this.overscan = true;
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this.ram = new Uint8Array(0x400);
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this.command = 0;
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this.dac = 0;
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this.dac_float = 0;
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this.xpos = 0;
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this.read = (0, emu_1.newAddressDecoder)([
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[0x0000, 0x3fff, 0x3fff, (a) => { return this.rom && this.rom[a]; }],
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[0x4000, 0x7fff, 0x3ff, (a) => { return this.ram[a]; }]
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]);
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this.write = (0, emu_1.newAddressDecoder)([
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[0x4000, 0x7fff, 0x3ff, (a, v) => { this.ram[a] = v; }],
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]);
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this.cpu = new ZilogZ80_1.Z80();
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this.connectCPUMemoryBus(this);
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this.connectCPUIOBus({
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read: (addr) => {
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return this.command & 0xff;
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},
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write: (addr, val) => {
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let dac = this.dac = val & 0xff;
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this.dac_float = ((dac & 0x80) ? -256 + dac : dac) / 128.0;
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}
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});
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}
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advanceFrame(trap) {
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this.pixels && this.pixels.fill(0); // clear waveform
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let maxCycles = this.cpuCyclesPerFrame;
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var n = 0;
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while (n < maxCycles) {
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if (trap && trap()) {
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break;
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}
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n += this.advanceCPU();
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}
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return n;
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}
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advanceCPU() {
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var n = super.advanceCPU();
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this.audio && this.audio.feedSample(this.dac_float, n);
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// draw waveform on screen
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if (this.pixels && !this.cpu.isHalted()) {
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this.pixels[((this.xpos >> 8) & 0xff) + ((255 - this.dac) << 8)] = 0xff33ff33;
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this.xpos = (this.xpos + n) & 0xffffff;
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}
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return n;
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}
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setKeyInput(key, code, flags) {
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var intr = (key - 49);
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if (intr >= 0 && (flags & 1)) {
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this.command = intr & 0xff;
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this.cpu.reset();
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}
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}
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}
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class WilliamsSoundPlatform extends baseplatform_1.BaseZ80MachinePlatform {
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newMachine() { return new WilliamsSound(); }
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getPresets() { return WILLIAMS_SOUND_PRESETS; }
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getDefaultExtension() { return ".c"; }
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;
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readAddress(a) { return this.machine.read(a); }
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}
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exports.WilliamsSoundPlatform = WilliamsSoundPlatform;
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emu_1.PLATFORMS['sound_williams-z80'] = WilliamsSoundPlatform;
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//# sourceMappingURL=sound_williams.js.map
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