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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 your own video game cartridges.
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!