Webster's Online Dictionary
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Common Expressions: HALT AND CATCH FIRE

ExpressionsDefinition
Halt and Catch FireHalt and Catch Fire, known by its mnemonic HCF, denotes any of several undocumented and semi-mythical computer machine code instructions with destructive side-effects, supposedly included for test purposes on several well-known architectures going as far back as IBM System/360. (references)

Source: compiled by the editor from various references; see credits.

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Specialty Expressions: HALT AND CATCH FIRE

ExpressionsDomainDefinition
Halt and Catch FireComputingHalt and Catch Fire (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. [Confirm?] (1995-12-14). Source: The Free On-line Dictionary of Computing..

Source: compiled by the editor from various references; see credits.

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