chip8-book VS chip8-test-suite

Not to discourage you, but there's already a CHIP-8 book in progress: https://github.com/aquova/chip8-book

WASM support would be so cool. There are lots of guides online which could help you out. I saw a guide for the chip8 and it didn't even look too difficult, you can check it out here https://github.com/aquova/chip8-book

Recently I've decided to learn low level programming with Rust. I asked for some projects to practice and got recommened to make a Chip8 emulator. That sounded fun so I searched a bit and found this guide that walks you step by step.

I made some emulators in Rust as a learning project during the start of the pandemic, and ran into the exact same issue when I wanted to make a wasm version to run in a browser. Eventually, I was able to figure out how to do it, although I do use the 'wasm-pack' Cargo package to assist with it (I think you can get away without it if you're really motivated, you just need to set up the targets and other elements yourself). Basically you define some Rust API to expose whatever you need from your project, then that and the project get compiled into one .wasm binary and some (surprisingly readable) JavaScript "glue" gets generated which allows for easy inclusion into a web page. It works well for code in the std, but I've had issues with 3rd party packages.

It's focused on emulation development, but I wrote a document that describes the process I followed: https://github.com/aquova/chip8-book/blob/master/src/wasm.md

I followed [this](https://github.com/aquova/chip8-book) book which uses Rust.

This is my first emulator. It is still missing a few bells and whistles like the sound timer, but otherwise it passes the basic tests from Timendus (https://github.com/Timendus/chip8-test-suite). I've also been thinking about making a Fortran dialect suitable for CHIP-8 (https://fortran-lang.discourse.group/t/fortran-chip-8-interp...).

Here is a reddit threadfor documentation resources and apparently the r/EmuDev discord has even more. Personally i used wikipedia and youtube to understand what it was & what it should look like (i remember still not getting it at first) and then Cowgod's Chip-8 Technical Reference as main reference for implementing the Instructions and overall architecture (beware that some instructions are missing key details about flag updating and other stuff another source will need to be used). Then the Chip8-test-suite by Tim Franssen was a godsend for the debugging phase. (you can go to Octo and try out some Chip8 games first if you want) also download some game-roms for testing.

Oh and with "test ROMs" I didn't mean "test with more ROMs", but use ROMs that are actually meant for testing 😉 See for example https://github.com/Timendus/chip8-test-suite

The emulator still has issues but it is largely usable. It passes most of the tests in test ROMs that I have found, in particular the ones here. It also has a simple debugger that actually helped me find issues in my implementation.

thanks alot man! i'll now run the roms in chip8-test-suite...

If you're at this point in the chip8 process, you may be able to run something like https://github.com/Timendus/chip8-test-suite to identify some common issues such as forgetting to set a flag or doing arithmetic operations slightly wrong. Maybe one of these common issues is the culprit.