~gotlou/chip8-emulator

Basic emulator for the CHIP-8 system in C
~gotlou/chip8-emulator

New git repository added

1 year, 7 months ago

#CHIP-8 Emulator

#Overview

This project aims to write a small and functional CHIP-8 emulator (or more accurately an interpreter, since CHIP-8 wasn't ever real hardware) in C using SDL to render the screen.

It implements most of the instructions, but there are still bugs to be fixed.

Note: the ibm.ch8 ROM file that used to be included in the source code was sourced from this git repo, for testing purposes only.

#Origin

I am interested in learning more about computers, and emulation seemed like an interesting way to do so. I chose CHIP-8 because it would provide one of the simplest ways to get into this branch of computing, and followed the following guides to build this:

  • A tutorial to build a hypothetical VM, which was extremely simple as it only had a couple registers, instructions etc. While I ended up using very little of this tutorial's code, it did influence me in the initial commits. I actually built part of this tutorial and used it as the foundation before eventually changing the code drastically. The only parts that really remain is the code for the stack.

  • This excellent writeup of CHIP-8 gives a lot of information regarding how to build the emulator, and explains the major opcodes as well without any code.

#Requirements

Make sure you have the following in order to both build and run the emulator on your system:

gcc, make, SDL2

These packages vary by Linux distro, so here are the common ones:

  • Fedora:
SDL2 SDL2-devel
  • Ubuntu:
libsdl2 libsdl2-dev

#Installation

Clone this repo, cd into it and run make. You'll get a vm executable which you can execute.

#Usage

To run a specific ROM, run

./vm /path/to/ROM/file.ch8

#Status

Input and audio are being worked on, but other than that, the rest of the emulator seems to work.