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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.
   The MC6800 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