Replying to a message of Peter Magnusson to Scott McNay:
 SM>> It's 100% compatible
 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?
Most differences in teh instructions are bugs.. there are some minor 
differences in other features, such as the length of the prefetch queue. On 
the 286, a PUSH to stack writes the pushed value to the stack, then 
decrements SP; no other Intel CPU behaves this way. On the 18x and 286, the 
top 3 bits of register displacement are ignored by shift instructions. There 
is a minor difference between the 8088 and other CPUs in the way CX is 
treated during something like "rep  lods byte ptr es:[si]" (I believe, on the 
88, that CX will not actually be zero when the instruction completes).
 SM>> I don't recall which.  Anyway, the part that surprised me
 SM>> what that IBM made PS/2's that used an 808x CPU.
 PM> Oh, that must have been a long time ago ... ?
PS/2 50.. yes, a long time ago :)
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