Memory slots and cards connectors pinouts
SIMM=Single Inline Memory Module. ECC=Error Correcting Code.
Pin ECC Optimized Description
1VSSVSSGround
2DQ0DQ0Data 0
3DQ1DQ1Data 1
4DQ2DQ2Data 2
5DQ3DQ3Data 3
6DQ4DQ4Data 4
7DQ5DQ5Data 5
8DQ6DQ6Data 6
9DQ7DQ7Data 7
10VCCVCC+5 VDC
11PD5PD5Presence Detect 5
12A0A0Address 0
13A1A1Address 1
14A2A2Address 2
15A3A3Address 3
16A4A4Address 4
17A5A5Address 5
18A6A6Address 6
19n/cn/cNot connected
20DQ8DQ8Data 8
21DQ9DQ9Data 9
22DQ10DQ10Data 10
23DQ11DQ11Data 11
24DQ12DQ12Data 12
25DQ13DQ13Data 13
26DQ14DQ14Data 14
27DQ15DQ15Data 15
28A7A7Address 7
29DQ16DQ16Data 16
30VCCVCC+5 VDC
31A8A8Address 8
32A9A9Address 9
33n/cn/cNot connected
34/RAS1/RAS1Row Address Strobe 1
35DQ17DQ17Data 17
36DQ18DQ18Data 18
37DQ19DQ19Data 19
38DQ20DQ20Data 20
39VSSVSSGround
40/CAS0/CAS0Column Address Strobe 0
41A10A10Address 10
42A11A11Address 11
43/CAS1/CAS1Column Address Strobe 1
44/RAS0/RAS0Row Address Strobe 0
45/RAS1/RAS1Row Address Strobe 1
46DQ21DQ21Data 21
47/WE/WERead/Write
48/ECC/ECC 
49DQ22DQ22Data 22
50DQ23DQ23Data 23
51DQ24DQ24Data 24
52DQ25DQ25Data 25
53DQ26DQ26Data 26
54DQ27DQ27Data 27
55DQ28DQ28Data 28
56DQ29DQ29Data 29
57DQ30DQ30Data 30
58DQ31DQ31Data 31
59VCCVCC+5 VDC
60DQ32DQ32Data 32
61DQ33DQ33Data 33
62DQ34DQ34Data 34
63DQ35DQ35Data 35
64n/cDQ36Data 36
65n/cDQ37Data 37
66n/cDQ38Data 38
67PD1PD1Presence Detect 1
68PD2PD2Presence Detect 2
69PD3PD3Presence Detect 3
70PD4PD4Presence Detect 4
71n/cDQ39Data 39
72VSSVSSGround
72 pin SIMM connector layout
72 pin SIMM connector
at the computer
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SIMM with ECC (72 pin) visual pinout:
SIMM with ECC (72 pin) diagram
click to enlarge
Source(s) of this and additional information: Various productsheets at IBM Memory Products, from Hardware Book
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