8bitworkshop/gen/tools/sim6502.js

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
const MOS6502_1 = require("../common/cpu/MOS6502");
const disasm6502_1 = require("../common/cpu/disasm6502");
const util_1 = require("../common/util");
class CPUSimulator {
    constructor() {
        this.ok = false;
        this.linebuf = '';
        this.cpu = new MOS6502_1.MOS6502();
        this.ram = new Uint8Array(0x10000);
        this.cpu.connectMemoryBus(this);
    }
    loadROM(rom) {
        var hdrlen = 0;
        var prgstart = 0x200;
        if (rom[0] == 0x00)
            hdrlen = 0;
        else if (rom[0] == 0x73 && rom[1] == 0x69)
            hdrlen = 12;
        else
            throw Error("Bad header " + rom[0]);
        this.ram.set(rom.slice(hdrlen), prgstart);
        this.ram[0xfff4] = 0x60; // RTS
        this.ram[0xfff5] = 0x60; // RTS
        this.ram[0xfff6] = 0x60; // RTS
        this.ram[0xfff7] = 0x60; // RTS
        this.ram[0xfff8] = 0x60; // RTS
        this.ram[0xfffc] = (prgstart & 0xff);
        this.ram[0xfffd] = ((prgstart >> 8) & 0xff);
        this.cpu.reset();
        this.ok = true;
    }
    read(a) {
        return this.ram[a] & 0xff;
    }
    write(a, v) {
        if (a >= 0x200 && a <= 0xbfff) {
            this.warn("Write in code area: " + (0, util_1.hex)(a, 4));
        }
        if (a >= 0x100 && a < (this.cpu.getSP() | 0x100)) {
            this.warn("Write outside stack area: " + (0, util_1.hex)(a, 4));
        }
        this.ram[a] = v;
    }
    readConst(a) {
        return this.ram[a] & 0xff;
    }
    tick() {
        this.cpu.advanceInsn();
        this.log();
    }
    warn(s) {
        console.log("###", (0, util_1.hex)(this.cpu.getPC(), 4), s);
    }
    log() {
        var st = this.cpu.saveState();
        var pc = this.cpu.getPC();
        var b0 = this.readConst(pc);
        var b1 = this.readConst(pc + 1);
        var b2 = this.readConst(pc + 2);
        var line = (0, disasm6502_1.disassemble6502)(pc, b0, b1, b2);
        var stack = "";
        for (var i = 0xff; i > st.SP - 0; i--) {
            stack += (0, util_1.hex)(this.readConst(i + 0x100), 2);
            //if (i==st.SP) stack += " ";
        }
        console.log((0, util_1.hex)(pc, 4), (0, util_1.rpad)(line.line, 30), (0, util_1.hex)(st.A), (0, util_1.hex)(st.X), (0, util_1.hex)(st.Y), (0, util_1.hex)(st.SP), st.C ? "C" : "-", st.N ? "N" : "-", st.Z ? "Z" : "-", st.V ? "V" : "-", stack);
        if (pc == 0xfff7) {
            let addr = this.readStackArg(0);
            let s = '';
            for (var i = 0; i < this.readStackArg(2); i++) {
                let cc = this.readConst(addr + i);
                s += String.fromCharCode(cc);
                this.linebuf += s;
                if (cc == 10 || cc == 13) {
                    console.log("---LINE", this.linebuf);
                    this.linebuf = '';
                }
            }
            console.log("---WRITE", s, st.A, (0, util_1.hex)(addr), this.readStackArg(2));
        }
        else if (pc == 0xfff9) {
            console.log("---EXIT", st.A);
            this.ok = false;
        }
        else if (b0 == 0x00 || line.line == 'KIL') {
            this.ok = false;
        }
        else if (b0 == 0x20 || b0 == 0x60) {
            console.log();
        }
    }
    readStackArg(offset) {
        var a = (this.cpu.getSP() | 0x100) + offset + 3;
        return this.readConst(a) + this.readConst(a + 1) * 256;
    }
}
const fs = require('fs');
const rom = fs.readFileSync(process.argv[2], null);
console.log(rom);
var sim = new CPUSimulator();
sim.loadROM(rom);
while (sim.ok) {
    sim.tick();
}
//# sourceMappingURL=sim6502.js.map