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- Path: 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
- References: <1jj1frINNho0@usenet.INS.CWRU.Edu> <C15puJ.1DI@sci.kun.nl> <C18A2L.Dtx@hkuxb.hku.hk>
- Sender: news@alsys1.aecom.yu.edu
- Organization: School of Engineering and Applied Sciences, UCLA
- Lines: 26
- Nntp-Posting-Host: yu1.yu.edu
-
- 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 :-) ????!
- ****************************************************************************
-
-