Path: utzoo!utgpu!watmath!att!tut.cis.ohio-state.edu!cica!gatech!bbn!kurz-ai!simcha
From: simcha@kurz-ai.UUCP (Simcha Lerner)
Newsgroups: comp.binaries.ibm.pc.d
Subject: Re: soft alt-ctrl-minus
Keywords: Change from 4.77 to 8 Mhz
Message-ID: <302@kurz-ai.UUCP>
Date: 8 Aug 89 19:30:23 GMT
References: <977@mplvax.EDU>
Reply-To: simcha@kurz-ai.UUCP (Simcha Lerner)
Organization: Kurzweil A.I. Waltham, Mass.
Lines: 25

In article <977@mplvax.EDU> martin@mplvax.EDU (Martin Olivera) writes:
>I have an old PC-XT compatible with Turbo option (4.77 to
>8 Mhz). Does anyone know how to program the switch from
>standard to turbo?. 

Since each machine has different hardware for changing speeds, and
there is no standard BIOS function to control the machine's speed
(after all, IBMs are all monospeed), there is no route available
except to contact the manufacturer.  Your only other possible
alternative is to disassemble whatever software (if any) that
came with the machine to control the speed.

Some brain-dead machines can ONLY change speed via hardware.
Some VERY brain-dead machines can't even change speed while running!
(I think the latter are totally extinct now, but you can never
be sure.)

-- 
Simcha Lerner
Kurzweil Applied Intelligence

PLEASE NOTE ADDRESS: NO RETURN MAIL VIA bbn PLEASE

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