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   -=> On 05-13-20 13:05, John Riley wrote to August Abolins <=-   
      
    AA> instruction Halt and Catch Fire (HCF), the execution of which would   
    AA> cause the computer's central processing unit to stop working (catch fire   
      
    JR> Yep, specifically on the 6800 series CPU's.   
      
   I had heard that the originel Intel 4004 had a HCF instruction that effectively   
   shorted +5V to GND via the CPU, letting the magic smoke out. :)  It was a   
   design flaw, not an intentional "self destruct" instruction caused by the CPU's   
   logic gates being put into an inintended state, when a certain undocumented   
   (and unintended!) instruction was executed.   
      
   There are references to this on the Internet, but it's hard to tell how much   
   truth is in it.   
      
      
   ... A great deal of money is never enough once you have it.   
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