From: joemonk64@gmail.com   
      
   > The instruction would refuse to change the shift   
   > value on an 8086. On an 80286 it would only   
   > need to support a shift value up   
   > to 8.   
   >   
   > Almost no extra circuitry would be required.   
   >   
      
   Real mode on a 286 is confined to 4 bits (limited to 1MB). You need extra   
   circuitry in the MMU if you want to do anything more.   
      
   > An 80386 should support a shift of 16.   
   > Almost no extra circuitry would be required.   
      
   Yep. Same answer as for 286. Extra MMU circuitry to do any more than 4 bits in   
   real mode.   
      
   > The cost is close to nothing because there   
   > are no extra address lines.   
      
   Its not the address lines. Its the circuitry in the MMU to handle the larger   
   shifts.   
      
   Joe   
      
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