27 Mar
1998
27 Mar
'98
3:33 p.m.
David C. Jenner wrote:
1) Does this really work? I thought you couldn't
over clock a true AT?
It varies, most ATs can run at 8Mhz (mine does, with a JET 386
adapter board). I know a few actually did go up to 10, maybe 12
if you got the one in a million. Mine won't run at 9 Mhz.
2) Would increasing the 286-6 to a 286-8,10,12
increase the frequency
at which it could reliably run? I have a PGA
286-8, but I'm not
sure there are faster PGA 286s?
I think there were 80286's made all the way up to 20Mhz (the AMD
ones). You can also put in an adapter card to upgrade to a 386.
I have an '86 vintage AT that has the 386 adapter, then I also
upgraded the 386 to a surplus Cyrix 486DR2 (clock doubled), so I
get an effective 16Mhz with a 486 instruction set. I think it's
a bit faster than a 386SX-16, mostly from the cache on the Cyrix
CPU.
3) Any software needed? (The ROMs appear to be the
same as on my other
machine.)
The IBM ROM ran with the 8Mhz speedup. When I went to the Cx486
I replaced it with an MRBIOS ROM (but I still have the
original).
Jack Peacock