all of game boy advance and nintendo ds hardware is exhaustively documented in a single text file: https://problemkaputt.de/gbatek.txt https://problemkaputt.de

all of game boy advance and nintendo ds hardware is exhaustively documented in a single text file: https://problemkaputt.de/gbatek.txt https://problemkaputt.de/gbatek.txt (but you can replace txt with htm for a fancier version) this ranges from physical description to compact arm instruction set reference -- you really only need this document (and a way to get your console to run your code!) to program completely from scratch. i've picked up a dsi because it can load code from an sd card, so only the console, an sd card and a computer is required for programming it, but see https://news.ycombinator.com/item?id=47706877 https://news.ycombinator.com/item?id=47706877 further down this thread for the case for preferring the gba.