Plex86 currently only works on Pentium class CPUs and beyond.
Essentially, you must have a CPU which has a split I+D TLB cache.
Following is a list of CPUs which were reported to pass a test
some time ago, to determine if plex86 would work on them.
CPU work?
=======================
386 no
486-DX66 no
Cyrix PR150+ no
Cyrix PR200+ no
Cyrix MediaGX233 no
Cyrix M2 PR300 MX no
Cyrix M2 333 no
AMD K5 PR100 no
IDT C6 200 no
NexGen Nx586 100 no
P 60 yes
P 90 yes
P SL 75 yes
P 100 yes
P 133 yes
P 166 yes
P 166 MMX yes
P 200 yes
P 200 MMX yes
P 233 yes
PPro 180 yes
PPro 200 yes
P2 233 MMX yes
P2 266 yes
P2 350 yes
P2 400 yes
P2 450 yes
P2 Xeon 400 yes
P2 Xeon 450 yes
P3 450 yes
P3 500 yes
Celeron 300 yes
Celeron 300A yes
Celeron 333A yes
Celeron 366 yes
Celeron 400 yes
Celeron 466 yes
AMD K6-200 yes
AMD K6-2 233 yes
AMD K6-2 300 yes
AMD K6-2 400 yes
AMD K6-350 yes
AMD K6-3 400 yes
AMD K6-3 450 yes
AMD K7(Athlon) yes
IDT WinChip 200 yes