Re: HELP! Trying to upgrade memory.

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#20350

From: Peter Herweijer
Date: Wed, 27 Jan 1993 10:41

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In <15960@med1.crosfield.co.uk> mjh@crosfield.co.uk (michael hember) writes:

>It had 4 1Meg SIMMs in bank 0 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 or jumpers on the board for memory config.
>
>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

That's two 1Mbit*4 and one 1Mbit*1. Ok.

>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)

WHAT? Maybe someone can correct me on this, but this looks suspiciously
like 256K, 80nS RAM instead of 1M, 70nS.  Test it out: remove the old
SIMMs and plug these into bank 0.  If it test 1Mb, you've been cheated.

Good luck.

Peter Herweijer
pieterh@sci.kun.nl

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References: <1993Jan4.174315.62446@cc.usu.edu> <15960@med1.crosfield.co.uk>

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Path: arc1-ca.pugleaf.net!sparky!uunet!ferkel.ucsb.edu!taco!gatech!rpi!usc!howland.reston.ans.net!spool.mu.edu!agate!ames!sun-barr!news2me.EBay.Sun.COM!seven-up.East.Sun.COM!sungy!news.Sweden.Sun.COM!swippy!seunet!sunic!mcsun!sun4nl!sci.kun.nl!pieterh
From: pieterh@sci.kun.nl (Peter Herweijer)
Newsgroups: comp.sys.ibm.pc.hardware,comp.sys.ibm.pc.misc
Subject: Re: HELP! Trying to upgrade memory.
Message-ID: <C1IDpw.2xG@sci.kun.nl>
Date: 27 Jan 93 10:41:55 GMT
References: <1993Jan4.174315.62446@cc.usu.edu> <15960@med1.crosfield.co.uk>
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