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- 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
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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
-