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:

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Last update: 30 Jan 2023 - Changelog | Legal Info & Contact