alt Hacker News> illegal instructions... were often used by programmers
Intentionally, with an expected effect? I'd need a citation for that.
> illegal instructions... were often used by programmers
Intentionally, with an expected effect? I'd need a citation for that.
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)