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Article #3110

Re: CMOS mismatch 486 system oddity

#3110
From: David Longley
Date: Sun, 28 Jun 1998 00:00
51 lines
2756 bytes

PROBLEM 1
---------
I have a strange problem with a 486 PCI board.

1.2GB hard disk
1.44MB floppy
16MB RAM

PCI board with 256K cache and intel DX100

BOARD uses um 8663, 85c496, 85c497 and has on board IO.

On power up, it behaves as if it has lost CMOS settings. In  fact 
it *has* lost its CMOS settings. But I have replaced the  onboard 
battery - and THAT made no difference. So I purchased an external 
lithium  battery  and plugged that into the  ext  battery  backup 
pins. Makes no difference, as soon as thr PC is turned off, I get 
a  scan for the hard disk type (which it finds) even  though  I'd 
entered the correct parameters into SETUP.

I  get  a message of a CMOS corrupt, loading defaults.  But,  the 
time and date are NOT lost.

So, it seems it's NOT the battery per se. So what can it be?

The board worked fine for a year, then ws kept aside for a couple 
of months, then installed in a new machine with same CPU and RAM. 
What was new was soundcard, video card and 1.2GB hard disk and CD 
ROM.

I haven't disconnected the hard disk and floppy yet, but will  do 
just to make sure they are not providing wrong info.

2. Problem Two
--------------

System reboots intermittently from about 20 mins after power on.
Thought it was the power supply originally. Discounted that after
swapping the case today. So it looks like its the 2 x 8MB EDO RAM,
cache (COAST) or the Motherboard or CPU. ANy suggestions?

  
-- 
David Longley (check end reply line #)

Longley Consulting                                                  London, UK
Behaviour Assessment & Profiling Technology,
Research, Data Analysis and Training Services,
Small IT Systems                                http://www.longley.demon.co.uk
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From: David@longley.demon.co.uk (David Longley)
Subject: Re: CMOS mismatch 486 system oddity
Date: 1998/06/28
Message-ID: <899041024snz@longley.demon.co.uk>
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