From: mutazilah@nospicedham.gmail.com   
      
   On Tuesday, May 2, 2023 at 2:47:24 PM UTC+8, Paul Edwards wrote:   
      
   > On an 8086 possibilities are:    
   >    
   > 1. x'66' crashes due to invalid opcode.    
   > 2. x'66' behaves as a noop.    
   > 3. x'66' acts as an alias to some other instruction,    
   > e.g. x'56' or x'76', in the same way that x'82' was,    
   > until 2000, an alias for x'80'.    
   >    
   > Which of these is it?   
      
   Got an answer elsewhere. It is number 3 ...   
      
   All the 6x opcodes are aliases of the corresponding 7x (conditional jump)   
   opcodes on 8086 and 8088.   
      
   BFN. Paul.   
      
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