Yet Another Chip 8 Emulator

What is it?

This project is a Chip 8 emulator (interpreter) written in Squeak Smalltalk.

The original goal of these project was to learn how to code a simple emulator in smalltalk.

Installing and running a ROM

1. Make sure you have Metacello installed, running:

Installer ensureRecentMetacello.

2. Load the project with:

Metacello new
  baseline: 'Chip8';
  repository: 'github://thiagoslino/Chip8-Squeak:master';
  load

3. Running a ROM

Chip8 runProgram: '/path/to/rom/filename'.

The CHIP-8 had no specified clock speed, so we'll use a delay to control it. Different games run best at different speeds, so we can control it here.

ROMs

A collection of public domain ROMs that can be used with this emulator can be found at:

• https://www.zophar.net/pdroms/chip8/chip-8-games-pack.html
• https://johnearnest.github.io/chip8Archive/?sort=platform

Regular Keys

The original Chip 8 had a keypad with the numbered keys 0 - 9 and A - F (16 keys in total). Without any modifications to the emulator, the keys are mapped as follows:

Chip 8 Keypad	Keyboard Key
1 2 3 C	1 2 3 4
4 5 6 D	Q W E R
7 8 9 E	A S D F
A 0 B F	Z X C V

TODO

• Automatic ROMs download from Zophar
• Better morphic configuration (to configure speed, roms download button, pause, etc...)

Resources

• https://en.wikipedia.org/wiki/CHIP-8
• http://www.multigesture.net/articles/how-to-write-an-emulator-chip-8-interpreter/
• http://devernay.free.fr/hacks/chip8/C8TECH10.HTM