|
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
|
|
Memory
Main Page
9595 Main
Page
|