From: muta...@gmail.com   
      
   On Friday, July 16, 2021 at 1:53:10 PM UTC+10, Joe Monk wrote:   
      
   > > Sure. And the 8-bit, 16-bit and 32-bit operations done   
   > > in mov al/ah/ax/eax also have unique opcodes.   
      
   > Actually, they dont. The same opcode is used x'89' for 16 and 32 bit   
   operations...   
      
   There is an x'66' in front of the 16-bit op-code. It wouldn't   
   work otherwise.   
      
   That's why we've been talking about x'66'.   
      
   BFN. Paul.   
      
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