Pinouts of Connectors

72 pin ECC SIMM connector pinout

layout
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SIMM=Single Inline Memory Module. ECC=Error Correcting Code.

72 pin SIMM connector pin-out & layout
72 pin SIMM connector  at the computer
Pin ECC Optimized Description
1 VSS VSS Ground
2 DQ0 DQ0 Data 0
3 DQ1 DQ1 Data 1
4 DQ2 DQ2 Data 2
5 DQ3 DQ3 Data 3
6 DQ4 DQ4 Data 4
7 DQ5 DQ5 Data 5
8 DQ6 DQ6 Data 6
9 DQ7 DQ7 Data 7
10 VCC VCC +5 VDC
11 PD5 PD5 Presence Detect 5
12 A0 A0 Address 0
13 A1 A1 Address 1
14 A2 A2 Address 2
15 A3 A3 Address 3
16 A4 A4 Address 4
17 A5 A5 Address 5
18 A6 A6 Address 6
19 n/c n/c Not connected
20 DQ8 DQ8 Data 8
21 DQ9 DQ9 Data 9
22 DQ10 DQ10 Data 10
23 DQ11 DQ11 Data 11
24 DQ12 DQ12 Data 12
25 DQ13 DQ13 Data 13
26 DQ14 DQ14 Data 14
27 DQ15 DQ15 Data 15
28 A7 A7 Address 7
29 DQ16 DQ16 Data 16
30 VCC VCC +5 VDC
31 A8 A8 Address 8
32 A9 A9 Address 9
33 n/c n/c Not connected
34 /RAS1 /RAS1 Row Address Strobe 1
35 DQ17 DQ17 Data 17
36 DQ18 DQ18 Data 18
37 DQ19 DQ19 Data 19
38 DQ20 DQ20 Data 20
39 VSS VSS Ground
40 /CAS0 /CAS0 Column Address Strobe 0
41 A10 A10 Address 10
42 A11 A11 Address 11
43 /CAS1 /CAS1 Column Address Strobe 1
44 /RAS0 /RAS0 Row Address Strobe 0
45 /RAS1 /RAS1 Row Address Strobe 1
46 DQ21 DQ21 Data 21
47 /WE /WE Read/Write
48 /ECC /ECC  
49 DQ22 DQ22 Data 22
50 DQ23 DQ23 Data 23
51 DQ24 DQ24 Data 24
52 DQ25 DQ25 Data 25
53 DQ26 DQ26 Data 26
54 DQ27 DQ27 Data 27
55 DQ28 DQ28 Data 28
56 DQ29 DQ29 Data 29
57 DQ30 DQ30 Data 30
58 DQ31 DQ31 Data 31
59 VCC VCC +5 VDC
60 DQ32 DQ32 Data 32
61 DQ33 DQ33 Data 33
62 DQ34 DQ34 Data 34
63 DQ35 DQ35 Data 35
64 n/c DQ36 Data 36
65 n/c DQ37 Data 37
66 n/c DQ38 Data 38
67 PD1 PD1 Presence Detect 1
68 PD2 PD2 Presence Detect 2
69 PD3 PD3 Presence Detect 3
70 PD4 PD4 Presence Detect 4
71 n/c DQ39 Data 39
72 VSS VSS Ground

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Pinouts.ru > Pinouts of different memory connectors >  Pinout of 72 pin ECC SIMM connector and layout of 72 pin SIMM connector

Source(s): Various productsheets at IBM Memory Products, from Hardware Book
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