249 lines
6.9 KiB
TypeScript
249 lines
6.9 KiB
TypeScript
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import { BaseZ80VDPBasedMachine } from "./vdp_z80";
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import { newAddressDecoder, padBytes, Keys, makeKeycodeMap } from "../common/emu";
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import { hex } from "../common/util";
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import { MasterAudio, SN76489_Audio } from "../common/audio";
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import { SMSVDP, GameGearVDP } from "../common/video/tms9918a";
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// http://www.smspower.org/Development/Index
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// http://www.smspower.org/uploads/Development/sg1000.txt
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// http://www.smspower.org/uploads/Development/richard.txt
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// http://www.smspower.org/uploads/Development/msvdp-20021112.txt
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// http://www.smspower.org/uploads/Development/SN76489-20030421.txt
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var SG1000_KEYCODE_MAP = makeKeycodeMap([
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[Keys.UP, 0, 0x1],
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[Keys.DOWN, 0, 0x2],
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[Keys.LEFT, 0, 0x4],
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[Keys.RIGHT, 0, 0x8],
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[Keys.A, 0, 0x10],
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[Keys.B, 0, 0x20],
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[Keys.GP_A, 0, 0x10],
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[Keys.GP_B, 0, 0x20],
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[Keys.P2_UP, 0, 0x40],
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[Keys.P2_DOWN, 0, 0x80],
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[Keys.P2_LEFT, 1, 0x1],
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[Keys.P2_RIGHT, 1, 0x2],
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[Keys.P2_A, 1, 0x4],
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[Keys.P2_B, 1, 0x8],
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[Keys.VK_BACK_SLASH, 1, 0x10], // reset
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[Keys.VK_ENTER, 1, 0x80], // start/pause
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]);
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export class SG1000 extends BaseZ80VDPBasedMachine {
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numVisibleScanlines = 240;
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defaultROMSize = 0xc000;
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ram = new Uint8Array(0x400);
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constructor() {
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super();
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this.init(this, this.newIOBus(), new SN76489_Audio(new MasterAudio()));
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}
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getKeyboardMap() { return SG1000_KEYCODE_MAP; }
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vdpInterrupt() {
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this.probe.logInterrupt(0xff);
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return this.cpu.interrupt(0xff); // RST 0x38
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}
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read = newAddressDecoder([
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[0xc000, 0xffff, 0x3ff, (a) => { return this.ram[a]; }],
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[0x0000, 0xbfff, 0xffff, (a) => { return this.rom && this.rom[a]; }],
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]);
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write = newAddressDecoder([
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[0xc000, 0xffff, 0x3ff, (a,v) => { this.ram[a] = v; }],
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]);
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getVCounter() : number { return 0; }
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getHCounter() : number { return 0; }
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setMemoryControl(v:number) { }
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setIOPortControl(v:number) { }
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readIO(addr:number) {
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switch (addr & 0xc1) {
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case 0x40: return this.getVCounter();
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case 0x41: return this.getHCounter();
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case 0x80: return this.vdp.readData();
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case 0x81: return this.vdp.readStatus();
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case 0xc0: return this.inputs[0] ^ 0xff;
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case 0xc1: return this.inputs[1] ^ 0xff;
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}
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return 0;
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}
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writeIO(addr:number, val:number) {
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switch (addr & 0xc1) {
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case 0x00: return this.setMemoryControl(val);
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case 0x01: return this.setIOPortControl(val);
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case 0x40:
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case 0x41: return this.psg.setData(val);
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case 0x80: return this.vdp.writeData(val);
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case 0x81: return this.vdp.writeAddress(val);
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}
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}
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newIOBus() {
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return {
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read: (addr:number) => {
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addr &= 0xff;
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//console.log('IO read', hex(addr,4));
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return this.readIO(addr);
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},
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write: (addr:number, val:number) => {
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addr &= 0xff;
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val &= 0xff;
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//console.log('IO write', hex(addr,4), hex(val,2));
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this.writeIO(addr, val);
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}
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};
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}
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}
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///
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export class SMS extends SG1000 {
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cartram = new Uint8Array(0);
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pagingRegisters = new Uint8Array(4);
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romPageMask : number;
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latchedHCounter = 0;
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ioControlFlags = 0;
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// TODO: hide bottom scanlines
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ram = new Uint8Array(0x2000);
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newVDP(frameData, cru, flicker) {
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return new SMSVDP(frameData, cru, flicker);
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}
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reset() {
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super.reset();
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this.pagingRegisters.set([0,0,1,2]);
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}
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getVCounter() {
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var y = this.scanline;
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return (y <= 0xda) ? (y) : (y - 6);
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}
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getHCounter() {
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return this.latchedHCounter;
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}
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computeHCounter() {
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return 0;
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/*
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var t0 = this.startLineTstates;
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var t1 = this.cpu.getTstates();
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return (t1-t0) & 0xff; // TODO
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*/
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}
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setIOPortControl(v:number) {
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if ((v ^ this.ioControlFlags) & 0xa0) { // either joystick TH pin
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this.latchedHCounter = this.computeHCounter();
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//console.log("H:"+hex(this.latchedHCounter)+" V:"+hex(this.getVCounter()));
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}
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this.ioControlFlags = v;
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}
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getPagedROM(a:number, reg:number) {
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//if (!(a&0xff)) console.log(hex(a), reg, this.pagingRegisters[reg], this.romPageMask);
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return this.rom && this.rom[a + ((this.pagingRegisters[reg] & this.romPageMask) << 14)]; // * $4000
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}
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read = newAddressDecoder([
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[0xc000, 0xffff, 0x1fff, (a) => { return this.ram[a]; }],
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[0x0000, 0x03ff, 0x3ff, (a) => { return this.rom && this.rom[a]; }],
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[0x0400, 0x3fff, 0x3fff, (a) => { return this.getPagedROM(a,1); }],
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[0x4000, 0x7fff, 0x3fff, (a) => { return this.getPagedROM(a,2); }],
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[0x8000, 0xbfff, 0x3fff, (a) => {
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var reg0 = this.pagingRegisters[0]; // RAM select?
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if (reg0 & 0x8) {
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return this.cartram[(reg0 & 0x4) ? a+0x4000 : a];
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} else {
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return this.getPagedROM(a,3);
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}
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}],
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]);
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write = newAddressDecoder([
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[0xc000, 0xfffb, 0x1fff, (a,v) => {
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this.ram[a] = v;
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}],
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[0xfffc, 0xffff, 0x3, (a,v) => {
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this.pagingRegisters[a] = v;
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this.ram[a+0x1ffc] = v;
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}],
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[0x8000, 0xbfff, 0x3fff, (a,v) => {
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var reg0 = this.pagingRegisters[0]; // RAM select?
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if (reg0 & 0x8) {
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if (this.cartram.length == 0)
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this.cartram = new Uint8Array(0x8000); // create cartridge RAM lazily
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this.cartram[(reg0 & 0x4) ? a+0x4000 : a] = v;
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}
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}],
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]);
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loadROM(data:Uint8Array) {
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if (data.length <= 0xc000) {
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this.rom = padBytes(data, 0xc000);
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this.romPageMask = 3; // only pages 0, 1, 2
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} else {
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switch (data.length) {
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case 0x10000:
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case 0x20000:
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case 0x40000:
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case 0x80000:
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this.rom = data;
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this.romPageMask = (data.length >> 14) - 1; // div $4000
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break;
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default:
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throw Error("Unknown rom size: $" + hex(data.length));
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}
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}
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//console.log("romPageMask: " + hex(this.romPageMask));
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this.reset();
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}
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loadState(state) {
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super.loadState(state);
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this.pagingRegisters.set(state.pr);
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this.cartram.set(state.cr);
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this.latchedHCounter = state.lhc;
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this.ioControlFlags = state.iocf;
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}
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saveState() {
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var state = super.saveState();
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state['pr'] = this.pagingRegisters.slice(0);
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state['cr'] = this.cartram.slice(0);
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state['lhc'] = this.latchedHCounter;
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state['iocf'] = this.ioControlFlags;
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return state;
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}
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getDebugInfo(category, state) {
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switch (category) {
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case 'SMS': // TODO
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return super.getDebugInfo(category, state) +
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"\nBank Regs: " + this.pagingRegisters + "\n";
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default: return super.getDebugInfo(category, state);
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}
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}
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}
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// https://segaretro.org/images/1/16/Sega_Game_Gear_Hardware_Reference_Manual.pdf
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export class GameGear extends SMS {
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newVDP(frameData, cru, flicker) {
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return new GameGearVDP(frameData, cru, flicker);
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}
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readIO(addr:number) {
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switch (addr & 0xc1) {
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case 0x00: return (~this.inputs[1] & 0x80) | 0x40;
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case 0xdc: return this.inputs[0] ^ 0xff;
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case 0xdd: return this.inputs[1] ^ 0xff;
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}
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return super.readIO(addr);
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}
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}
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