Help needed on PC Memory Upgrade

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#18987

From: michael hember
Date: Wed, 20 Jan 1993 09:30

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I have a 486-66, ALI-M1409 chipset motherboard with 1991 AMI bios
and ISA bus

It had 4 1Meg SIMMs in bank 0 which I assume are 1Mx9 ( 30 pins 3 chips, 
2 the same and 1 different)  and everything was fine with this config.
I then added 4 1Mx9 70nS SIMMs in bank 1 and the system now tells me that
I only have 1Meg of RAM and no extended memory.
If I take the SIMMs out of bank 1 it goes back to 4Meg again
There are no DIP switches on the board for memory config and the manual
simply says run cmos setup after adding memory.

The new SIMMs look slightly different to the old SIMMS in as much as the
old SIMMs have 3 chips all the same size with 8 legs on each side
2off Pt no.- HM514400AS7
1off Pt no.- HM511000AJP7

new SIMMs have 3 chips 2 large, 1 small with 4 legs on each side
2off Pt No.- M514256A-80J   (OKI)
1off Pt No.- M51C256-80     (OKI)

Is there a kind soul out there who can wave a magic wand and solve this
problem. Any help would be greatly appreciated.

regards

Mike Hember.

email - mjh@crosfield.co.uk    Tel ++44-0442-230000 x3221

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Path: arc1-ca.pugleaf.net!sparky!uunet!paladin.american.edu!howland.reston.ans.net!usc!cs.utexas.edu!hermes.chpc.utexas.edu!news.utdallas.edu!corpgate!bnrgate!bnr.co.uk!stl!crosfield!mjh
From: mjh@crosfield.co.uk (michael hember)
Newsgroups: comp.sys.ibm.pc.hardware
Subject: Help needed on PC Memory Upgrade
Keywords: SIMM
Message-ID: <15961@med1.crosfield.co.uk>
Date: 20 Jan 93 09:30:59 GMT
Organization: Crosfield Electronics, Hemel Hempstead, United Kingdom.
Lines: 30