Pinouts >  Memory slots and cards connectors
72 pin SIMM connector layout
72 pin SIMM connector
at the computer
Pin Non-Parity Parity Description
1VSSVSSGround
2DQ0DQ0Data 0
3DQ16DQ16Data 16
4DQ1DQ1Data 1
5DQ17DQ17Data 17
6DQ2DQ2Data 2
7DQ18DQ18Data 18
8DQ3DQ3Data 3
9DQ19DQ19Data 19
10VCCVCC+5 VDC
11n/cn/cNot connected
12A0A0Address 0
13A1A1Address 1
14A2A2Address 2
15A3A3Address 3
16A4A4Address 4
17A5A5Address 5
18A6A6Address 6
19A10A10Address 10
20DQ4DQ4Data 4
21DQ20DQ20Data 20
22DQ5DQ5Data 5
23DQ21DQ21Data 21
24DQ6DQ6Data 6
25DQ22DQ22Data 22
26DQ7DQ7Data 7
27DQ23DQ23Data 23
28A7A7Address 7
29A11A11Address 11
30VCCVCC+5 VDC
31A8A8Address 8
32A9A9Address 9
33/RAS3/RAS3Row Address Strobe 3
34/RAS2/RAS2Row Address Strobe 2
35n/cPQ3Parity bit 3 (for the 3rd byte, bits 16-23)
36n/cPQ1Parity bit 1 (for the 1st byte, bits 0-7)
37n/cPQ2Parity bit 2 (for the 2nd byte, bits 8-15)
38n/cPQ4Parity bit 4 (for the 4th byte, bits 24-31)
39VSSVSSGround
40/CAS0/CAS0Column Address Strobe 0
41/CAS2/CAS2Column Address Strobe 2
42/CAS3/CAS3Column Address Strobe 3
43/CAS1/CAS1Column Address Strobe 1
44/RAS0/RAS0Row Address Strobe 0
45/RAS1/RAS1Row Address Strobe 1
46n/cn/cNot connected
47/WE/WERead/Write
48n/cn/cNot connected
49DQ8DQ8Data 8
50DQ24DQ24Data 24
51DQ9DQ9Data 9
52DQ25DQ25Data 25
53DQ10DQ10Data 10
54DQ26DQ26Data 26
55DQ11DQ11Data 11
56DQ27DQ27Data 27
57DQ12DQ12Data 12
58DQ28DQ28Data 28
59VCCVCC+5 VDC
60DQ29DQ29Data 29
61DQ13DQ13Data 13
62DQ30DQ30Data 30
63DQ14DQ14Data 14
64DQ31DQ31Data 31
65DQ15DQ15Data 15
66n/cn/cNot connected
67PD1PD1Presence Detect 1
68PD2PD2Presence Detect 2
69PD3PD3Presence Detect 3
70PD4PD4Presence Detect 4
71n/cn/cNot connected
72VSSVSSGround

Size:

PD2 PD1 Size
GNDGND4 or 64 MB
GNDNC2 or 32 MB
NCGND1 or 16 MB
NCNC8 MB

Accesstime:

PD4 PD3 Accesstime
GNDGND50, 100 ns
GNDNC80 ns
NCGND70 ns
NCNC60 ns
Notes: A9 is a N/C on 256k and 512k modules.
A10 is a N/C on 256k, 512k, 1M and 4M modules.
RAS1/RAS3 are N/C on 256k, 1M and 4M modules.
Pinout status: +6 -0
According to 6 reports in our database (6 positive and 0 negative) the SIMM (72 pin) pinout should be correct.

Is this pinout
NO DIY devices
SIMM (72 pin) visual pinout:click to enlarge
Source(s) of this and additional information: Various productsheets at IBM Memory Products, from Hardware Book, Mark Brown, Karsten Wenke, SOYO Computer Inc
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