How to change change Turbo mode on an AT?

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From: phys169
Date: Tue, 11 Aug 1992 23:03

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I need to be able to change the CPU speed on an AT clone via software; does
anyone know the port or have sample code??  (I know it isn't the same as on
the XT's I've looked at).

If anyone has a list of what CMOS locations the startup speed is stored in
for different BIOSes, that would be nice too (I know some store it in the
bottom two bits of location 0x3F of CMOS RAM, but at least two BIOSes don't).


AdvTHANKSance,
Mark Aitchion, University of Canterbury.
[if you e-mail I'll post a summary]

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Message-ID: <1992Aug12.110351.287@csc.canterbury.ac.nz>

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Path: arc1-ca.pugleaf.net!sparky!uunet!comp.vuw.ac.nz!canterbury.ac.nz!phys169
From: phys169@csc.canterbury.ac.nz
Newsgroups: comp.os.msdos.programmer,alt.lang.asm,comp.sys.ibm.pc
Subject: How to change change Turbo mode on an AT?
Message-ID: <1992Aug12.110351.287@csc.canterbury.ac.nz>
Date: 12 Aug 92 11:03:51 +1200
Organization: University of Canterbury, Christchurch, New Zealand
Lines: 12