Alright, so Doom isn’t actually running on the key chain itself, but rather a BifferBoard: a small 150MHz x86 containing ethernet, serial, and even USB with only one watt of power consumption! The project is to show how easy it is to program the BifferBoard and getting it talking to other hackable items – such as the picture key chain for a display. Doom does appear a bit slow, but [Biff] figures its do to how haphazardly it grabs keyboard input over SSH.