I remember playing a lot with my old TI-83. One of the most impressive games was DOOM: [link] Best video I can find: [this video] Unfortunately I never had a TI-89. Would've been awesome if I had one back in the day, and then test these games: [link] and [link]
I'm sorry to tell you it is even more complicated than if it can run doom. Does this count as doom? [this video] Another definition i have seen is the QWERTY keyboard restriction. If i remember correctly some good calculators from Texas Instruments have abc keyword to be allowed on some big math tests in US. (Or is this maybe just a myth in Europe?)
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