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Re:Everything in C is undefined behavior by chuckadams on Wednesday May 20, 2026 @11:26AM (#48209326)
Some desultory googling turned up:

* https://www.nesdev.org/wiki/CPU_unofficial_opcodes#Games_usi...

* https://hitmen.c02.at/files/docs/c64/NoMoreSecrets-NMOS6510U... (doesn't name any software, but some copy protection schemes were already known to use them)

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