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  • Big Gray Wall
    n. What faces a {VMS} user searching for documentation. A full VMS kit comes on a pallet, the documentation taking up around 15... VIEW ENTIRE DEFINITION

  •  View Definition: 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 up.