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PS/2 80 Memory Modules
IBM Personal System/2 model 80 386 (8580) uses proprietary 32-bit memory modules. Earlier 1 Mb and 2 Mb modules are all 85ns in speed and had been designed for 16 and 20 MHz machines. These modules can't be used in 25 MHz systems as they are too slow. As 25 MHz models were introduced, faster 80ns 4 Mb modules became available - in fact, 25 MHz machines can use only such modules. However, if 4 Mb modules are installed in 16 or 20 MHz machines, only 2 Mb out of 4 will be available (actually, 20 MHz models will be able to "view" all 4 Mb, but will be in trouble if some memory expansion card is installed).

1 Mb
IBM P/N 72X7475A
18 chips
mm 122x99

date code 8733 (on connector, max 8736)

1 Mb
IBM P/N 4098539
12 chips
mm 122x99

date code 8939 (8940)

1 Mb
IBM P/N 40985553
9 chips
mm 122x99

date code 9037 (8809)

2 Mb
IBM P/N 90X8993
24 chips
mm 123x99
date code 268 (509)

2 Mb
IBM P/N 90X8670
18 chips
mm 121x99

date code 299 (319)

2 Mb
IBM P/N 15F6822
18 chips
mm 121x99
date code 3889 (4189)

4 Mb
IBM P/N 33F5498
36 chips
mm 110x118
(mid-90)

4 Mb
IBM P/N 33F5498
36 chips
mm 110x118
(late-91)


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This page was first published on the web on Nov. 11, 2001
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Moved to Tripod on Sept. 23, 2002