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- Newsgroups: comp.sys.ibm.pc.hardware
- Path: sparky!uunet!usc!sdd.hp.com!saimiri.primate.wisc.edu!hp9000.csc.cuhk.hk!hkuxb.hku.hk!hkuxa.hku.hk!h9117228
- From: h9117228@hkuxa.hku.hk (Li)
- Subject: Re: Just upgraded 386DXL-40 to 486DX2-50 CPU
- Message-ID: <C18A2L.Dtx@hkuxb.hku.hk>
- Sender: usenet@hkuxb.hku.hk (USENET News System)
- Nntp-Posting-Host: hkuxa.hku.hk
- Organization: The University of Hong Kong
- References: <1jj1frINNho0@usenet.INS.CWRU.Edu> <C15puJ.1DI@sci.kun.nl>
- Date: Thu, 21 Jan 1993 23:47:09 GMT
- Lines: 36
-
- In article <C15puJ.1DI@sci.kun.nl> pieterh@sci.kun.nl (Peter Herweijer) writes:
- >In <1jj1frINNho0@usenet.INS.CWRU.Edu> ab245@cleveland.Freenet.Edu (Sam Latonia) writes:
- >
- >>I just upgraded my cpu tonight from the AMD386DXL-40 to the INTEL
- >>486DX2-50 cpu. I notice that it takes 40 seconds now from the time
- >>that I flip the power switch on, on the computer to the opening
- >>screen of my Menu Direct program. (I don't run Windows or OS2)
- >>It used to take only 25 seconds with the old 386DXL-40. Can anyone
- >>explain why the new 486 cpu after all is set on the mother board
- >>for the new cpu takes 15 seconds longer to run the CMOS than it
- >>did before the upgrade?????
- >
- >Hmm... BIOS ROM code takes longer to execute...
- >
- >>the video test went down from 386=6510 chr/ms
- >>to 4028 chr/ms this is in the turbo mode using the LandMark V2.0???
- >>It did go up on the normel mode from the 3191 chr/ms (386 cpu) to
- >>the same rate of 4028 chr/ms as I have in the turbo mode, why?
- >
- >video code slows down, (practically) independent of CPU speed...
- >
- >You apparently have a memory interface problem. Tell me: have
- >you accidentally disabled ROM shadowing? Weird wait state
- >settings? Are _both_ caches enabled (probably for the 386 the
- >'internal cache' entry was set 'disabled')?
- >
- >Peter Herweijer
- >pieterh@sci.kun.nl
-
- 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.
-
-