Editing Killer poke (section)

===TRS-80 Model I & III===
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.<ref>{{Cite web|url = http://www.vintagecomputer.net/fjkraan/comp/trs80/grafix80/80grafix.html|title = 80-GRAFIX Manual|date = 1980|access-date = 8 June 2015|website = Vintagecomputer.net|archive-date = 27 February 2016|archive-url = https://web.archive.org/web/20160227094802/http://www.vintagecomputer.net/fjkraan/comp/trs80/grafix80/80grafix.html|url-status = live}}</ref> 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|date = June 2015}} While this is not a single "killer poke", it demonstrates a software [[failure mode]] that could permanently damage the hardware.

The TRS-80 Model I also has a similar cassette motor relay accessible via a memory poke command and could result in damaging the relay.