It is always possible that you have an aberant CPU... however, since the Cyrix chip runs Windows 3.1, 95 and 98 w/o any problems, and these programs inherently are more top heavy, I would have to say that this is not a problem for this chip. However, something is obviously amiss, if the computer will crash in DOS... btw, what kind of programs are these? What is your chip set/motherboard? is your ram matching? is your bios optimized for the Cyrix CPU? Cyrix is notorious for having a slow, but functional FPU, however my experience with their stuff has been completely w/o problems (from the cpu). Frank B Smith -----Original Message----- From: Michael Beechey <[log in to unmask]> I have some DOS progs that simply will not run on my CyrixP200+/Win95b, with any of the DOS settings, modifying config,......even booting and running with a 6.20 disk, with the same config and autoexec from my 486! I'm wondering if the CPU is the culprit.... Anyone have similar problems/solutions? thanks in advance, Michael Beechey, a Canuck in Sucre, Bolivia ----------------------------------------------------------------- "The Earth is but one country, and mankind its citizens" Baha'u'llah -----------------------------------------------------------------