True Blue PC/AT Turbo board by Megahertz

From: Jack Peacock <peacock_at_simconv.com>
Date: Fri Mar 27 23:33:05 1998

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
Received on Fri Mar 27 1998 - 23:33:05 GMT