From: joemonk64@gmail.com   
      
   > Ok, but I want to run 64-bit Windows, and I note that    
   > long mode (but not legacy mode) of the x64 supports    
   > PM16.    
   >    
      
   No, it doesnt. Long mode supports CM16 (compatibility mode).   
      
   "When long mode is active and CS.L is cleared to 0, the processor is in   
   compatibility mode, as shown in Table 14-4 on page 436. In compatibility mode,   
   CS.D controls default operand and address sizes exactly as it does in the   
   legacy x86 architecture.    
   Setting CS.D to 1 specifies default operand and address sizes as 32 bits.   
   Clearing CS.D to 0 specifies default operand and address sizes as 16 bits."   
      
   http://developer.amd.com/wordpress/media/2012/10/24593_APM_v2.pdf   
      
   Joe   
      
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