EightyEighty.js
A nice little Intel 8080 emulator for Node.js and Browser!
About • Installation • Usage • Resources • License
About
Originally I wrote this because I was interested in how emulators work, and what a CPU actually does.
But, after several days of work, I managed to put together a pretty good codebase,
therefore I've decided to make this emulator available as a library of its own,
so that anyone could embed it in their web pages or applications!
I mostly followed the tutorial here: http://emulator101.com
Try it out
I've made a little website to showcase this library: arcade.skayo.dev
Installation
With npm:
$ npm install eighty-eighty-js
With pnpm (recommended):
$ pnpm install eighty-eighty-js
With yarn:
$ yarn add eighty-eighty-jsor you can directly add it to your website via unpkg:
<script src="https://unpkg.com/eighty-eighty-js"></script>Usage
If this project gains more attention I'll add some documentation!
You'll probably need to install typed-numbers too!
import { Cpu, Memory, Device } from 'eighty-eighty-js';
import { promises as fs } from 'fs';
import { u8 } from 'typed-numbers';
// Read ROM
const programBuffer = await fs.readFile('./example-rom.bin');
// Init Memory
const mem = new Memory();
// Load ROM into Memory
mem.load(programBuffer, 0x100);
// Device that handles inputs and outputs
const device: Device = {
input(port: u8) {
console.log('INPUT', port);
return u8(0);
},
output(port: u8, byte: u8) {
console.log('OUTPUT', port, byte);
},
};
// Init CPU
const cpu = new Cpu(mem, device);
// Execution Loop
while (true) {
// Check if halted
if (cpu.halted) break;
cpu.next(); // CPU operation without any delays
// OR
await cpu.step(); // Simulates real Intel 8080 speed
}Resources
These resources helped a lot while developing the emulator: