*** Darryl Gregorash wrote in a message to Peter Magnusson:
 PM> Way... I didn't know they EVER made a processor
 PM> 100% compatible with another. There's often
 PM> some small diffrences in undocummented or
 PM> even docummented instructions & features, right?
DG> Any differences in teh instructions are bugs.. 
The most blatant bug must be the POP CS bug in the 808x; Intel was (probably) 
forced to leave it in for compatibility, so it wasn't changed until the 
18x.
Sometime one chip will have instruvtions that a different chip doesn't have, 
but thats usually a specialty thing.  The most obvious example of a 
non-specialty new instruction is the CPUID, which appeared in newer 486s but 
not older ones.
--Scott.
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