Memory Module Pinouts

Model 80 Planar Memory

30-pin IBM SIMM Memory
72-pin IBM SIMM Memory


30-pin IBM SIMM Memory

PinSignal
1+5 Vdc
2-Column Address Strobe
3Data 0
4Address 0
5Address 1
6Data 1
7Address 2
8Address 3
9Ground
10Data 2
11Address 4
12Address 5
13Data 3
14Address 6
15Address 7
16Data 4
17Address 8
18N/C or Address 9 1)
19-Row Address Strobe 1
20Data 5
21-Write Enable (-Write Strobe)
22Ground
23Data 6
24Presence Detect 1
25Data 7
26Presence Detect 2
27-Row Address Strobe 0
28N/C or -Column Address Strobe 2)
29Parity Data In/Out
30+5 Vdc

Notes:
   1) Except for Model 30 (8086) planar memory sockets? (unconfirmed)
   2) Model 30 (8086) planar memory sockets only? (duplicate signal; unconfirmed)

References:


72-pin IBM SIMM Memory

PinSignalPinSignal
1Ground37Parity 1/Data 36 2)
2Data 038Parity 3/Data 38 2)
3Data 1639Ground
4Data 140Column Address Strobe 0
5Data 1741Column Address Strobe 2
6Data 242Column Address Strobe 3
7Data 1843Column Address Strobe 1
8Data 344Row Address Strobe 0
9Data 1945Row Address Strobe 1
10+5 Vdc46Block Select 1/Data 33 2)
11-Column Address Strobe Parity47Write Enable
12Address 048Reserved/Ground 2)
13Address 149Data 8
14Address 250Data 24
15Address 351Data 9
16Address 452Data 25
17Address 553Data 10
18Address 654Data 26
19Reserved/Address 10 1)55Data 11
20Data 456Data 27
21Data 2057Data 12
22Data 558Data 28
23Data 2159+5 Vdc
24Data 660Data 29
25Data 2261Data 13
26Data 762Data 30
27Data 2363Data 14
28Address 764Data 31
29Block Select 0/Data 32 2)65Data 15
30+5 Vdc66Block Select 2/Data 34 2)
31Address 867Presence Detect 0
32Reserved/Address 9 3)68Presence Detect 1
33Row Address Strobe 369Presence Detect 2
34Row Address Strobe 270Presence Detect 3
35Parity 2/Data 37 2)71Block Select 3/Address 11 1) 2)
36Parity 0/Data 35 2)72Ground

Notes:
   1) Late systems only (Model 85 Type 2, Model 76/77 i/s).
   2) Late systems only (Model 95, Model 76/77 i/s). Used only with ECC memory.
   3) All except early systems (Model 50, 70, P70).

References:

Content created and/or collected by:
Louis F. Ohland, Peter H. Wendt, David L. Beem, William R. Walsh, Tatsuo Sunagawa, Tomáš Slavotínek, Jim Shorney, Tim N. Clarke, Kevin Bowling, and many others.

Ardent Tool of Capitalism is maintained by Tomáš Slavotínek.
Last update: 20 Jan 2024 - Changelog | About | Legal & Contact