If you play Doom on your calculator, you'll no longer be stuck with greyscale gibs. A new update to the TI-Nspire port of the game has added support for color screens, along with some control and menu tweaks. If the demonstration below is any indication, it runs only a bit less smoothly on a TI-Nspire CX than it does on a smartphone, and can use either the d-pad or keyboard. It's supposed to work on any TI-Nspire model, not just those with touchpads.