In 2001, I wrote a homebrew game for the Atari 2600 called SCSIcide. I created a custom PCB to allow me to make my own cartridges for the system. As the homebrew community was starting to flourish, I designed a bunch of other circuit boards supporting different memory sizes and videogame consoles. I’ve finally gotten around to releasing the full documentation/source/Gerber plots/etc., so now people can make their own game cartridges for the Atari 2600, Atari 5200, Atari 8-bit computer, and Colecovision. Fun!
DIY Homebrew Video Game Cartridges