From: dj@nospicedham.delorie.com   
      
   Paul Edwards  writes:   
   > ; multiply cx:bx by dx:ax, result in dx:ax   
      
   Such would have three multiplies and a few adds:   
      
   LSW = bx * ax (lower 16, save upper 16 in XX)   
      
   MSW = bx * dx + cx * ax + XX (from lsw)   
      
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