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3 definitions found
 for HCF
From V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016) :

  HCF
         Hybrid Coordination Function (MAC, 802.11a)
         

From The Jargon File (version 4.4.7, 29 Dec 2003) :

  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. Compare {
      killer poke.
  

From The Free On-line Dictionary of Computing (30 December 2018) :

  HCF
  
     1.  Host Command Facility.
  
     2.  Halt and Catch Fire.
  
     [{Jargon File]
  
     (1999-01-24)
  

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