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- 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>
- Sender: news@sci.kun.nl (News owner)
- Organization: University of Nijmegen, The Netherlands
- Lines: 27
- Nntp-Posting-Host: wn2.sci.kun.nl
-
- 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
-