Chippy8

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A CHIP8 Emulator written in JavaScript

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“never use UInt16Array again” -ben

Downloads/hosts: Single file (html, offline)

Cloudflare (if my website domain ever expires)

ben3coder.dev (if my website domain ever expires)

Shortlink (Will always lead to some working copy (unless it expires))

• help from: https://tobiasvl.github.io/blog/write-a-chip-8-emulator/#6xnn-set

How the development went

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The boilerplate for everything was relatively easy, but once I started doing the programming for the emulator I made some mistakes that catched on later when I was implementing the other instructions like not including a index register or a program(?) register and a screen that was broken but looked fine to me. I also used the wrong type of array which skipped every other byte. Other than that, the instructions being implemented were straightforward with the guide that was provided in the guides tab for emulator and was pretty challenging at some parts which I did like but overall would write another emulator after this one is finished. Currently there is only 6 instructions implemented out of 35(?) but the rest should be relatively easy. The goal is to ship with atleast 50% of instructions implemented or enough to run all the tests on CHIP8 Test Suite.

Goal

• Good looking ui (for the example & iframe)
• Easy modularity to be used in other projects
• 100% accuracy
• Adjustable accuracy
• Adjustable clock speed
• IFrame-type embedding to run a file (https://example.com/embed?file=FILE) or a api like const chippy = new Chippy8(canvas, options);
• Much better code comments hopefully

Statistics

6/35 instructions implemented

Non-cycle accurate (700/s (adjustable?))

Instructions implemented: 🟥 - Broken 🟩 - Working 🟨 - Semi Working

Instruction	Status	Note
00EO	🟩	none
1NNN	🟩	none
6XNN	🟩	none
7XNN	🟩	none
ANNN	🟩	none
DXYN	🟨	May be buggy idk