122 lines
3.5 KiB
TypeScript
122 lines
3.5 KiB
TypeScript
|
|
import { Z80, Z80State } from "../common/cpu/ZilogZ80";
|
|
import { BasicMachine, CPU, Bus } from "../common/devices";
|
|
import { Platform, BaseZ80MachinePlatform } from "../common/baseplatform";
|
|
import { PLATFORMS, RAM, newAddressDecoder, padBytes, noise, setKeyboardFromMap, AnimationTimer, RasterVideo, Keys, makeKeycodeMap } from "../common/emu";
|
|
import { SampleAudio } from "../common/audio";
|
|
|
|
var WILLIAMS_SOUND_PRESETS = [
|
|
{ id: 'swave.c', name: 'Wavetable Synth' },
|
|
];
|
|
|
|
/****************************************************************************
|
|
|
|
Midway/Williams Audio Boards
|
|
----------------------------
|
|
|
|
6809 MEMORY MAP
|
|
|
|
Function Address R/W Data
|
|
---------------------------------------------------------------
|
|
Program RAM 0000-07FF R/W D0-D7
|
|
|
|
Music (YM-2151) 2000-2001 R/W D0-D7
|
|
|
|
6821 PIA 4000-4003 R/W D0-D7
|
|
|
|
HC55516 clock low, digit latch 6000 W D0
|
|
HC55516 clock high 6800 W xx
|
|
|
|
Bank select 7800 W D0-D2
|
|
|
|
Banked Program ROM 8000-FFFF R D0-D7
|
|
|
|
****************************************************************************/
|
|
|
|
class WilliamsSound extends BasicMachine {
|
|
cpuFrequency = 18432000 / 6; // 3.072 MHz
|
|
cpuCyclesPerFrame = this.cpuFrequency / 60;
|
|
cpuAudioFactor = 32;
|
|
canvasWidth = 256;
|
|
numVisibleScanlines = 256;
|
|
defaultROMSize = 0x4000;
|
|
sampleRate = this.cpuFrequency;
|
|
overscan = true;
|
|
|
|
cpu : Z80;
|
|
ram = new Uint8Array(0x400);
|
|
iobus : Bus;
|
|
|
|
command : number = 0;
|
|
dac : number = 0;
|
|
dac_float : number = 0;
|
|
xpos : number = 0;
|
|
|
|
read = newAddressDecoder([
|
|
[0x0000, 0x3fff, 0x3fff, (a) => { return this.rom && this.rom[a]; }],
|
|
[0x4000, 0x7fff, 0x3ff, (a) => { return this.ram[a]; }]
|
|
]);
|
|
|
|
write = newAddressDecoder([
|
|
[0x4000, 0x7fff, 0x3ff, (a, v) => { this.ram[a] = v; }],
|
|
]);
|
|
|
|
constructor() {
|
|
super();
|
|
this.cpu = new Z80();
|
|
this.connectCPUMemoryBus(this);
|
|
this.connectCPUIOBus({
|
|
read: (addr) => {
|
|
return this.command & 0xff;
|
|
},
|
|
write: (addr, val) => {
|
|
let dac = this.dac = val & 0xff;
|
|
this.dac_float = ((dac & 0x80) ? -256 + dac : dac) / 128.0;
|
|
}
|
|
});
|
|
}
|
|
|
|
advanceFrame(trap) : number {
|
|
this.pixels && this.pixels.fill(0); // clear waveform
|
|
let maxCycles = this.cpuCyclesPerFrame;
|
|
var n = 0;
|
|
while (n < maxCycles) {
|
|
if (trap && trap()) {
|
|
break;
|
|
}
|
|
n += this.advanceCPU();
|
|
}
|
|
return n;
|
|
}
|
|
|
|
advanceCPU() {
|
|
var n = super.advanceCPU();
|
|
this.audio && this.audio.feedSample(this.dac_float, n);
|
|
// draw waveform on screen
|
|
if (this.pixels && !this.cpu.isHalted()) {
|
|
this.pixels[((this.xpos >> 8) & 0xff) + ((255-this.dac) << 8)] = 0xff33ff33;
|
|
this.xpos = (this.xpos + n) & 0xffffff;
|
|
}
|
|
return n;
|
|
}
|
|
|
|
setKeyInput(key:number, code:number, flags:number) : void {
|
|
var intr = (key - 49);
|
|
if (intr >= 0 && (flags & 1)) {
|
|
this.command = intr & 0xff;
|
|
this.cpu.reset();
|
|
}
|
|
}
|
|
}
|
|
|
|
export class WilliamsSoundPlatform extends BaseZ80MachinePlatform<WilliamsSound> {
|
|
|
|
newMachine() { return new WilliamsSound(); }
|
|
getPresets() { return WILLIAMS_SOUND_PRESETS; }
|
|
getDefaultExtension() { return ".c"; };
|
|
readAddress(a) { return this.machine.read(a); }
|
|
|
|
}
|
|
|
|
PLATFORMS['sound_williams-z80'] = WilliamsSoundPlatform;
|