From: not_valid@nospicedham.comcast.net   
      
   "Bartc"  wrote in message news:Eu1dB.480685$lu5.423680@fx42.am4...   
      
   > I've used AC0 to AC15 before, but that's rather old-fashioned. So I   
   > decided on D0 to D15, with a register size also encoded within the   
   > register name, 'D' meaning 64 bits. (I think D0 to D15 were used as   
   > 32-bit data registers on the 68K.)   
      
   Given that B stands for byte and W stands for word, how is it   
   that A stands for doubleword and D for quadword?   
      
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