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In page Killer poke:

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The original TRS-80 and TRS-80 Model III had the ability to switch between a 32-character-wide display and a 64-character display. Doing so actuated a relay in the video hardware, accomplished by writing to a specific memory-mapped control register.[1] Programs that repeatedly switched between 32- and 64-character modes at high speed (either on purpose or accidentally) could permanently damage the video hardware.[citation needed] While this is not a single "killer poke", it demonstrates a software failure mode that could permanently damage the hardware.