Motherboard Woes

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Article #19145

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#19145

From: PFAN000
Date: Fri, 22 Jan 1993 00:43

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Greetings folks!

A couple of questions to all you seasoned technicians out there.

1) Is it possible to mix SIMMS modules of different speeds?  If
If so, what would be the worst possible occurance of a problem if
this were done?

2) Is it possible to mix SIMMS modules of different chip configs?
For instance, here is (or was) my configuration:


Bank0: 2 256kx3 80ns
Bank1: 2 256kx3 80ns
Bank2: 2 1MBx3 80ns
Bank3: 2 1MBx9 80ns

This gave me a total of 5 meg.  According to the motherboard
manual, 5 meg is an acceptable configuration, however it does
not go into details about the acceptability of different
module configurations.

My motherboard recently died with a "8024 keyboard controller
gate A20 error".  It is a 386sx-25 with AMI BIOS, and an
OPTI 82C283 Chipset.  The dealer refuses to replace it under
warranty because they say that the mixing of my SIMMS modules
caused the failure of my "keyboard controller".

I would like to hear any and all comments about this issue, and
if you reply, if you are a certified technician, please state
your position and/or company as well.  Thanks a bunch inadvance!

Pete Fanning
Internet: pfan@music.lib.matc.edu

Pete Fanning
Computer Operator
Office of Information Technology
Milwaukee Area Technical College

Internet: pfan@music.lib.matc.edu

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From: PFAN000 <PFAN@MUSIC.LIB.MATC.EDU>
Newsgroups: comp.sys.ibm.pc.hardware
Subject: Motherboard Woes
Date: 21 JAN 93 18:43:03 CST
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