From: muta...@gmail.com   
      
   On Monday, July 19, 2021 at 4:57:35 AM UTC+10, James Harris wrote:   
      
   > The difference is not always as simple as an 0x66 prefix byte. For   
      
   The 0x66 goes away completely simply by setting the   
   D bit appropriately in the descriptor.   
      
   > example, x86-16 and x86-32 can encode memory addresses in completely   
   > different ways. Consider the SIB byte encoding for 16-bit and 32-bit   
   > modes at   
   >   
   > [BX] in 16-bit mode   
   > [EDI] in 32-bit mode   
      
   Does this issue also go away if the D bit is set appropriately   
   in the descriptor table?   
      
   If not, the instruction needs to be eliminated from the C   
   compiler's repertoire to provide a lowest common   
   denominator.   
      
   And my question is - does that LCD give you a Turing machine?   
      
   If so, I finally know how to build my 8086 executables.   
      
   Thanks. Paul.   
      
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