From: joemonk64@gmail.com   
      
   > The same way that z/Arch running in AM64 executes   
   > a LR R3,R4 perfectly fine.   
   >   
   > So too the 80386 will execute "mov ax, bx" perfectly fine,   
   > in exactly the same manner as the 8086.   
   >   
   > At least I think it will. I'm more familiar with S/3X0   
   > assembler than x86.   
      
   On an S/370, an LR R3,R4 is a 32-bit move. Same for S/390, and z/Arch.   
      
   On an 8086, a mov ax,bx is a 16-bit instruction. Same on the 80386. In PM32,   
   that register is called EAX. AX only references the lower 16 bits of EAX.   
      
   See the problem? They're not the same operations.   
      
   Joe   
      
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