Way back when: People used screensavers to prevent "burn-in" on CRT monitors, where static images could permanently damage the screen. Screensavers like 3D Pipes animated the display during inactivity ...
TL;DR: Resourceful hackers have been running Doom, or ports of the original source code, on countless, most unlikely devices. Anything with a processor goes, from calculators to kitchen appliances, ...
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