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echo: 80xxx
to: PETER LOUWEN
from: BRIAN MCCLOUD
date: 1997-05-15 06:26:00
subject: Re: 586 instructions

PL> BM> Can someone give me a list of opcodes for any instructions added for
PL> BM> the 586/Pentium chip?  (I've got a TASM qref that only shows up to 
86
PL> BM> instructions.)
PL>Get a program called AsmEdit, filename: AEDT184.ZIP.
PL>From said program's (extensive) online help:
PL> Pentium + only instructions
PL>The following instructions are only implemented on 80586+:
PL>Note that these instructions can be changed on later processors like 
Intel's
PL>Pentium Pro.
PL>Opcodes:
PL>  RDMSR                                 0Fh 32h
PL>  WDMSR                                 0Fh 30h
PL>  RDTSC  (undoc.)                       0Fh 31h
PL>  CMPXCHG8B Mq                          0Fh C7h /r
PL>  RSM  (undoc.)                         0Fh AAh
PL> Pentium Pro + only instructions
PL>The following instructions are only implemented on 80686+:
PL> CMOV
PL> FCMOV
PL> FCOMI
PL> RDPMC
PL>All MMX˙Instructions will only be available on 80686, too.
Some descriptions, and opcodes for the second set might be nice...
((Cloud))
MauveCloud@juno.com
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