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From: poffen@sj.ate.slb.com (Russell Poffenberger)
Newsgroups: comp.sys.ibm.pc.hardware
Subject: Re: Parity Error on Motherboard (???)
Message-ID: <1990Sep18.163054.28534@sj.ate.slb.com>
Date: 18 Sep 90 16:30:54 GMT
References: <1990Sep17.181950.5990@thyme.jpl.nasa.gov> <1990Sep18.073020.3330@pegasus.com>
Reply-To: poffen@sj.ate.slb.com (Russell Poffenberger)
Organization: Schlumberger Technologies, San Jose, CA.
Lines: 27

In article <1990Sep18.073020.3330@pegasus.com> richard@pegasus.com (Richard Foulk) writes:
>>This is a last ditch effort, before I go out and replace my motherboard.
>>
>>I just added four more meg to my (generic Taiwan) 386SX motherboard, bringing
>>it to a total of eight meg.  The machine boots, memory test finds no errors, 
>>but both my protected mode operating systems, OS/2 1.1 and ESIX 3.2.C, crash.
>>Good old M'soft provides the wonderfully intuitive "Parity Error ????", 
>>while ESIX says "PANIC: Parity Error on Motherboard" followed by a dump 
>>message.
>>
>>By taking the two SIMMs out of the fourth bank, everything works ok.  I
>>swapped all eight SIMMs around in the first three banks, so I know they're
>>all good.  I only get the parity error when I plug SIMMs into the fourth bank.
>
>It is still possible that some of your SIMMs are bad.
>
>Are some of them Samsung brand?

It is also possible (since only the fourth bank causes problems) that the board
itself is bad, or one of the SIMM sockets in the fourth bank is bad. Many board
manufacturers don't test all the ram sockets.


Russ Poffenberger               DOMAIN: poffen@sj.ate.slb.com
Schlumberger Technologies       UUCP:   {uunet,decwrl,amdahl}!sjsca4!poffen
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San Jose, Ca. 95110             (408)437-5254