Doom has once again shown up on another platform, and this time it's a calculator. Doom89 is a clone of Doom powered by the FAT engine. It runs on TI graphing calculator models 89, 92+, and V200. It includes 32 levels, as well as all the abilities and weapons you'd expect. It even includes strafing and the classic menu. This is definitely worth checking out if you have one of the supported calculators.