8bitworkshop/gen/machine/mw8080bw.js

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.Midway8080 = void 0;
const ZilogZ80_1 = require("../common/cpu/ZilogZ80");
const devices_1 = require("../common/devices");
const emu_1 = require("../common/emu");
// http://www.computerarcheology.com/Arcade/
const SPACEINV_KEYCODE_MAP = (0, emu_1.makeKeycodeMap)([
    [emu_1.Keys.A, 1, 0x10],
    [emu_1.Keys.LEFT, 1, 0x20],
    [emu_1.Keys.RIGHT, 1, 0x40],
    [emu_1.Keys.P2_A, 2, 0x10],
    [emu_1.Keys.P2_LEFT, 2, 0x20],
    [emu_1.Keys.P2_RIGHT, 2, 0x40],
    [emu_1.Keys.SELECT, 1, 0x1],
    [emu_1.Keys.START, 1, 0x4],
    [emu_1.Keys.P2_START, 1, 0x2],
]);
const INITIAL_WATCHDOG = 256;
const PIXEL_ON = 0xffeeeeee;
const PIXEL_OFF = 0xff000000;
class Midway8080 extends devices_1.BasicScanlineMachine {
    constructor() {
        super();
        this.cpuFrequency = 1996800; // MHz
        this.canvasWidth = 256;
        this.numTotalScanlines = 262;
        this.numVisibleScanlines = 224;
        this.cpuCyclesPerLine = Math.floor(1996800 / (262 * 60));
        this.defaultROMSize = 0x2000;
        this.rotate = -90;
        this.sampleRate = 1;
        this.bitshift_offset = 0;
        this.bitshift_register = 0;
        this.cpu = new ZilogZ80_1.Z80();
        this.ram = new Uint8Array(0x2000);
        this.read = (0, emu_1.newAddressDecoder)([
            [0x0000, 0x1fff, 0x1fff, (a) => { return this.rom ? this.rom[a] : 0; }],
            [0x2000, 0x3fff, 0x1fff, (a) => { return this.ram[a]; }],
        ]);
        this.write = (0, emu_1.newAddressDecoder)([
            [0x2000, 0x23ff, 0x3ff, (a, v) => { this.ram[a] = v; }],
            [0x2400, 0x3fff, 0x1fff, (a, v) => {
                    this.ram[a] = v;
                    var ofs = (a - 0x400) << 3;
                    for (var i = 0; i < 8; i++) {
                        this.pixels[ofs + i] = (v & (1 << i)) ? PIXEL_ON : PIXEL_OFF;
                    }
                    //if (displayPCs) displayPCs[a] = cpu.getPC(); // save program counter
                }],
        ]);
        this.connectCPUMemoryBus(this);
        this.connectCPUIOBus(this.newIOBus());
        this.handler = (0, emu_1.newKeyboardHandler)(this.inputs, SPACEINV_KEYCODE_MAP);
    }
    newIOBus() {
        return {
            read: (addr) => {
                addr &= 0x3;
                //console.log('IO read', hex(addr,4));
                switch (addr) {
                    case 0:
                    case 1:
                    case 2:
                        return this.inputs[addr];
                    case 3:
                        return (this.bitshift_register >> (8 - this.bitshift_offset)) & 0xff;
                }
                return 0;
            },
            write: (addr, val) => {
                addr &= 0x7;
                val &= 0xff;
                //console.log('IO write', hex(addr,4), hex(val,2));
                switch (addr) {
                    case 2:
                        this.bitshift_offset = val & 0x7;
                        break;
                    case 3:
                    case 5:
                        // TODO: sound
                        break;
                    case 4:
                        this.bitshift_register = (this.bitshift_register >> 8) | (val << 8);
                        break;
                    case 6:
                        this.watchdog_counter = INITIAL_WATCHDOG;
                        break;
                }
            }
        };
    }
    startScanline() {
    }
    drawScanline() {
        // at end of scanline
        if (this.scanline == 95)
            this.interrupt(0xcf); // RST $8
        else if (this.scanline == 223)
            this.interrupt(0xd7); // RST $10
    }
    interrupt(data) {
        this.probe.logInterrupt(data);
        this.cpu.interrupt(data);
    }
    advanceFrame(trap) {
        if (this.watchdog_counter-- <= 0) {
            console.log("WATCHDOG FIRED"); // TODO: alert on video
            this.reset();
        }
        return super.advanceFrame(trap);
    }
    loadState(state) {
        super.loadState(state);
        this.bitshift_register = state.bsr;
        this.bitshift_offset = state.bso;
        this.watchdog_counter = state.wdc;
    }
    saveState() {
        var state = super.saveState();
        state.bsr = this.bitshift_register;
        state.bso = this.bitshift_offset;
        state.wdc = this.watchdog_counter;
        return state;
    }
    reset() {
        super.reset();
        this.watchdog_counter = INITIAL_WATCHDOG;
    }
}
exports.Midway8080 = Midway8080;
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