A recipe for inducing hardware damage on a
machine via insertion of invalid values (see poke) into a
memory-mapped control register; used esp. of various fairly
well-known tricks on bitty boxes without hardware memory
management (such as the IBM PC and Commodore PET) that can overload
and trash analog electronics in the monitor. See also HCF.
HCF /H-C-F/ n.
Mnemonic for `Halt and Catch Fire' any
of several undocumented and semi-mythical machine instructions with
destructive side-effects, supposedly included for test purposes on
several well-known architectures going as far back as the IBM 360....