Memory Connectors

How can you tell which SIMM is bad?
Installing Memory

The system board has eight 72-pin connectors for single inline memory modules (memory modules).  The connectors are divided into two banks of four connectors:  A1-A4 and B1-B4.

The following shows the pin numbering and signal assignments for each memory connector. Refer to Memory-Presence Detect for decoding of the presence-detect signals.
 

Pin
Signal
1
Ground
2
Data 0
3
Data 16
4
Data 1
5
Data 17
6
Data 2
7
Data 18
8
Data 3
9
Data 19
10
5 V dc
11
-Column address strobe parity
12
Address 0
13
Address 1
14
Address 2
15
Address 3
16
Address 4
17
Address 5
18
Address 6
19
Reserved
20
Data 4
21
Data 20
22
Data 5
23
Data 21
24
Data 6
25
Data 22
26
Data 7
27
Data 23
28
Address 7
29
Block select
30
+5 V dc
31
Address 8
32
Address 9
33
Row address strobe 3
34
Row address strobe 2
35
Parity 2
36
Parity 0
Pin
Signal
37
Parity 1
38
Parity 3
39
Ground
40
Column address strobe 0
41
Column address strobe 2
42
Column address strobe 3
43
Column address strobe 1
44
Row address strobe 0
45
Row address strobe 1
46
Block select 1
47
Write enable
48
Reserved
49
Data 8
50
Data 24
51
Data 9
52
Data 25
53
Data 10
54
Data 26
55
Data 11
56
Data 27
57
Data 12
58
Data 28
59
+5 V dc
60
Data 29
61
Data 13
62
Data 30
63
Data 14
64
Data 31
65
Data 15
66
Block select 2
67
Presence detect 0
68
Presence detect 1
69
Presence detect 2
70
Presence detect 3
71
Block select 3
72
Ground

 

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