https://makezine.com/article/home/fun-games/diy-homebrew-video-game-cartridges/
DIY Homebrew Video Game Cartridges - Make:
Feb 27, 2011 - Got an old Colecovision gathering dust? Don't give up on it, MAKE contributor Joe Grand (of hacker con badge fame) has detailed instructions on creating
homebrew video gamediycartridgesmake