"Halt and Catch Fire" (HCF) often is jargon that refers to documented or undocumented opcodes or code sequences that leads the CPU to crash:
https://en.wikipedia.org/wiki/Halt_and_Catch_Fire_(computing...
With a hat tip to all Commodore C64/MOS650 enthusiasts, I shall end this post with my favourite HCF sequence: 4C 10 7E.
_Happy watching!_
double is_computer_on_fire();
Returns the temperature of the motherboard if the computer is currently on fire. Smoldering doesn't count. If the computer isn't on fire, the function returns some other value.
( https://www.haiku-os.org/legacy-docs/bebook/TheKernelKit_Sys...)
If the computer isn't on, the value returned by this function is undefined.