Halt and Catch Fire
<humour, processor> (HCF) 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. The
Motorola 6800 microprocessor was the first for which an HCF opcode became widely known.
This instruction caused the processor to
toggle a subset of the
bus lines as rapidly as it could; in some configurations this could actually cause lines to burn up.
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