From: joemonk64@gmail.com   
      
   > > It would need to be, istm, an unique instruction for each of the 'shift'   
   values in the   
   > > microcode of the processor.   
   > Why?   
   >   
   > What's wrong with   
   >   
   > SSS AL   
   >   
   > Set segment shift to the value in AL   
   > which must be 0 to 16.   
   >   
   > And GSS AL to retrieve the value into AL   
      
   Wont work. You dont have enough space on the die to support that. CS, DS, ES,   
   and  SS are all 16-bit registers. You cant add (shift) 16-bits on the right   
   hand side without expanding the circuitry dramatically.   
      
   Joe   
      
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