From: nowhere@never.at   
      
   On 15.07.2021 02:36, muta...@gmail.com wrote:   
   > On Thursday, July 15, 2021 at 8:18:41 AM UTC+10, muta...@gmail.com wrote:   
   >   
   >> If it works then the next question is - does the 8086 ignore   
   >> x'66' and advance to the next byte? Or can x'66' be trapped   
   >> and ignored? Or if it is an alias, what effect does it have,   
   >> and can memory be structures to keep that x'66' from   
   >> harming anything important?   
      
   trap seems impossible (would mean all code run single step debug),   
   and who knows if it acts as a NOP on all 8086 ?   
      
   > And same question for a real 80286. There was no   
   > 32-bit "other" to worry about.   
      
   some brands may ignore it while others may have it as an alias,   
   so you better forget about using 66 in both worlds.   
      
   [your segment descriptor calculation...]   
   you still haven't realized that base bits 0..23 and 24..31 are   
   NOT adjective. There are two bytes in between.   
   You would have known this if you already wrote an 386 OS.   
   __   
   wolfgang   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)