Plex86 currently only works on Pentium class CPUs and beyond. For the current (old) virtualization techniques, 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. For the future (rev2) architecture, this split I&D TLB requirement will no longer be necesary. Any Pentium should work. Though, a certain amount of memory and processor speed will be practical and/or physical necessities. 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