Developer builds a cartridge that runs on the original GameBoy using Codex and Astra

Erik Natzke @NatzkeOriginally posted 2026.10.01

Open original on X

Picked up a #DevDay @modretro @Nintendo #Gameboy (via @eBay). Built directly from @OpenAI #Codex ✅ CONFIRMED! - @OpenAI Cartridge works* on OG #GB & #GBC ✅ #Astra was great at deploying as well as explaining the nuances and history behind the many editions of GameBoy. * The Original 1989 4 tone screen suffered mainly since it was afterthought (and a surprise) that was able to run the cartridge. Quality could be greatly improved through better contrast in the design.