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  2  definitions  found 
  From  Jargon  File  (4.2.3,  23  NOV  2000)  [jargon]: 
  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  (13  Mar  01)  [foldoc]: 
  1.    {Host  Command  Facility}. 
  2.    {Halt  and  Catch  Fire}. 
  [{Jargon  File}]