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The microcomputer revolution didn't just happen in the living room. During the 90s and early 2000s there were also Texas Instruments and other vendors with their lines of Z80 based graphing calculators!

Sounds boring? Quite the opposite. Even though these calculators have only comparatively small displays, the Z80 CPU as a base - clocked at 8 to 10MHz - is enough to get games, emulators and whole mini-operating systems up and running.

George Hilliard was and is one of the cool kids who knows exactly how this works. And in this wonderful article he talks about the Gameboy emulator for the TI-84 Plus, the Ash shell, KnightOS, and a whole bunch of other stuff that a mere mortal wouldn't think a calculator could do.

Exciting reading.