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import The65c02, { BitField, Pin } from "./65c02.ts";
// the thing used for ram
const ram = new Uint8Array(2**16);
// initiate the emulator
const cpu = new The65c02(function (this: The65c02) {
// since this is controlled by the user it's easy
// to map things into address space
this.io.data.set(ram[this.io.address.num()] ?? 0)
}, function (this: The65c02) {
// write
ram[this.io.address.num()] = this.io.data.num()
})
await cpu.loadInstructions()
// mem address $0000
ram[0xFFFC] = 0x00
ram[0xFFFD] = 0x80
// read code from file
const code = Deno.readFileSync('msbasic/tmp/eater.bin')
// write code to ram before execution
for (let offset = 0; offset < code.length; offset++) {
const byte = code[offset];
ram[0x8000 + offset] = byte;
}
// pull RESB low to reset the 65c02
cpu.io.reset.LO()
cpu.cycle()
//the cpu reset, pull RESB high and start execution!
cpu.io.reset.HI()
const debug = Deno.args.includes('-d')
// repeat until the cpu requests an interrupt
while (!cpu.io.interruptRequest.high) {
cpu.cycle();
// debug step-by-step mode
if (debug) {
const i = new Uint8Array(8);
await Deno.stdin.read(i);
if (i[0] == 'b'.charCodeAt(0)) {
console.log('BREAK!!')
break;
}
}
}
console.log('end of execution\n\nIO status:')
console.log(Object.entries(cpu.io)
.map(([name, io]) => {
if (io instanceof Pin) {
return ` ${name}: ${' '.repeat(20 - name.length)}${io.high ? "HI" : "LO"}`
} else if (io instanceof BitField) {
return ` ${name}: ${' '.repeat(20 - name.length)}${io.bits.map(k=>+k).join('')} (0x${io.num().toString(16)})`
}
}).join('\n'));
console.log('\nregisters:')
console.log(` A: ${cpu.regA.bits.map(k=>+k).join('')} (0x${cpu.regA.num().toString(16)})`)
console.log(` X: ${cpu.regX.bits.map(k=>+k).join('')} (0x${cpu.regX.num().toString(16)})`)
console.log(` Y: ${cpu.regY.bits.map(k=>+k).join('')} (0x${cpu.regY.num().toString(16)})`)
console.debug('\nRAM:')
Deno.writeFileSync('ram.bin', ram)
// new Deno.Command('hexdump', {
// args: ['-C', 'ram.bin']
// }).spawn()
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