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Article View: comp.sys.ibm.pc.hardware
Article #19616

Re: Just upgraded 386DXL-40 to 486DX2-50 CPU

#19616
From: Chaim Manaster
Date: Sun, 24 Jan 1993 04:18
26 lines
1693 bytes
In article <C18A2L.Dtx@hkuxb.hku.hk> h9117228@hkuxa.hku.hk (Li) writes:
>The slowdowns are probably due to a change in the system clock (40MHz
>for the 386 to 25MHz for the 486DX2).  The boot-up (a lot of disk
>accesses) and video speed are dependent on the ISA bus speed.  I'd bet
>his bus speed is set at 1/5 ACLK (8MHz for a 40MHz system clock, but
>5MHz now for 25MHz system clock).  Changing it to 1/3 ACLK should fix
>it.


How does one change ACLK? Is this a variable somewhere? (DOS, BIOS
etc?) Is this a hardware signal? (In which case a user can't change
it?) If it is a variable please be specific on how to find it and
then how to change it (temporarily and permanently).

Also is ACLK only specific to certain brand name computers or
software,  or is it generic to all pc-clones?

-- 
***************************************************************************
	Henry Manaster          *     EMail: manaster@yu1.yu.edu
	Brooklyn, NY            *
                                *
	Disclaimer: The above is not necessarily MY opinion nor that 
				of anyone else :-)  ????!
****************************************************************************
 
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Path: arc1-ca.pugleaf.net!sparky!uunet!psinntp!alsys1!yu1.yu.edu!manaster
From: manaster@yu1.yu.edu (Chaim Manaster)
Newsgroups: comp.sys.ibm.pc.hardware
Subject: Re: Just upgraded 386DXL-40 to 486DX2-50 CPU
Message-ID: <1319@alsys1.aecom.yu.edu>
Date: 24 Jan 93 04:18:35 GMT
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