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- From: nnw@concurrent.co.uk (Neil Watson)
- Newsgroups: comp.sys.ibm.pc.hardware
- Subject: Re: CMOS Hidden Refresh option
- Message-ID: <1993Jan27.100703.8040@concurrent.co.uk>
- Date: 27 Jan 93 10:07:03 GMT
- References: <9301242056.45@rgm.com> <2137@acf5.NYU.EDU>
- Sender: usenet@concurrent.co.uk (NetNews System)
- Organization: Concurrent Computer Corporation, Slough, England
- Lines: 39
- Nntp-Posting-Host: bugs.concurrent.co.uk
-
- In article <2137@acf5.NYU.EDU> liuyu@acf5.NYU.EDU (liuyu) writes:
- >ronaldm@rgm.com (Ronald Mendoza) writes:
- >
- > >I have a 486DX-50 and was looking at the Hidden Refresh option in the CMOS.
- > >(AMI BIOS) Well, it defaults to Disabled, but I recall reading that it should
- > >be enabled for 3 chip 1M, or any 4M. SO, I Enabled the setting since I have
- > >(4) 4Mx9 9-chip (do 3-chip exist?) and (4) 1Mx9 3-chip. Now, my 3D Bench
- > >rating went from 37 fps to 40 fps. Is everything set correctly now?
- >
- > >-Ron (ronaldm@rgm.com)
- >
- >Can you enlighten us where the hidden refresh option is? I also have AMI
- >BIOS (12/12/91).
- On my 386 AMI BIOS (2/90 or 24Dec90, depending on whose date you count
- :) ) it is called "Concurrent Refresh" (No relation... ) vs. "AT Style
- Refresh".
-
- My default was "Concurrent Refresh" and that worked fine with 1Mx9 9
- chip SIMMS. When I added some 1Mx9 3 chip SIMMS, the world fell apart!
- By setting "AT Style Refresh" sanity was restored.
-
- It was suggested to me that this setting affects how many address lines
- get refreshed, and that the BIOS KNOWS that it needs to refresh all of
- them for 4Mx9 SIMMS, but doesn't recognise that it needs to do so for the
- newer 3 chip 1Mx9 SIMMS (hence you have to tell it...).
-
- I found that when the settings were wrong, and I had "parity checking"
- enabled, that I got lots of parity errors - which got worse as the
- machine warmed up. Windows 3.1 wasn't terribly happy either....
-
- That is what I found, anyway....
-
- Neil
-
- --
- Neil Watson, ESDG Product Support, Concurrent Computer Corp
- G0BLD 227 Bath Road, Slough, Berks, SL1 4AX, England
- Phone: (+44) 753 513360 FAX: (+44) 753 513303
- (nnw@slough.ccur.com, nnw@concurrent.co.uk or 100021,3041 @ Compuserve)
-