From: nowhere@nevernet.at   
      
   On 21/02/2022 08:03, James Harris wrote:   
   ...   
   >> What about RM code? ISTM that a lot of RM code could work unchanged   
   >>> in PM16.   
   >> again: look at privileged instructions, work in RM but may fail in PM.   
   >   
   > RM would have to work very hard to have privileged instructions. ;-)   
   >   
   > Everything I've found recently suggests that after CR0.PE is set (and   
   > the prefetch queue flushed if necessary) the processor will be in   
   > Protected Mode whereas you, IIUC, are sure it would remain in Real Mode   
   > until CS is reloaded.   
      
   > If so, can you think of an instruction or sequence which would   
   > distinguish between the two?   
      
   give me some time to check in deep detail, I'll be back on this soon.   
   __   
   wolfgang   
      
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