Xref: utzoo comp.sys.ibm.pc.hardware:1565 comp.unix.sysv386:458
Path: utzoo!attcan!uunet!snorkelwacker!usc!elroy.jpl.nasa.gov!thyme!kaleb
From: kaleb@thyme.jpl.nasa.gov (Kaleb Keithley	)
Newsgroups: comp.sys.ibm.pc.hardware,comp.os2.misc,comp.unix.sysv386
Subject: Parity Error on Motherboard (???)
Message-ID: <1990Sep17.181950.5990@thyme.jpl.nasa.gov>
Date: 17 Sep 90 18:19:50 GMT
Sender: kaleb@thyme.jpl.nasa.gov (Kaleb Keithley)
Followup-To: comp.sys.ibm.pc.hardware
Organization: Jet Propulsion Laboratory, Pasadena, CA
Lines: 19

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.

Anyone have any thoughts?
-- 
Kaleb Keithley                      Jet Propeller Labs
kaleb@thyme.jpl.nasa.gov

"So that's what an invisible barrier looks like!"