72 pin SIMM connector at the computer |
Pin
|
Non-Parity
|
Parity
|
Description |
1 |
VSS
|
VSS
|
Ground
|
2 |
DQ0
|
DQ0
|
Data 0 |
3 |
DQ16
|
DQ16
|
Data 16
|
4 |
DQ1
|
DQ1
|
Data 1 |
5 |
DQ17
|
DQ17
|
Data 17
|
6 |
DQ2
|
DQ2
|
Data 2 |
7 |
DQ18
|
DQ18
|
Data 18
|
8 |
DQ3
|
DQ3
|
Data 3 |
9 |
DQ19
|
DQ19
|
Data 19
|
10
|
VCC
|
VCC
|
+5 VDC
|
11
|
n/c
|
n/c
|
Not connected
|
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
|
A10
|
A10
|
Address 10
|
20
|
DQ4
|
DQ4
|
Data 4 |
21
|
DQ20
|
DQ20
|
Data 20
|
22
|
DQ5
|
DQ5
|
Data 5 |
23
|
DQ21
|
DQ21
|
Data 21
|
24
|
DQ6
|
DQ6
|
Data 6 |
25
|
DQ22
|
DQ22
|
Data 22
|
26
|
DQ7
|
DQ7
|
Data 7 |
27
|
DQ23
|
DQ23
|
Data 23
|
28
|
A7
|
A7
|
Address 7 |
29
|
A11
|
A11
|
Address 11
|
30
|
VCC
|
VCC
|
+5 VDC
|
31
|
A8
|
A8
|
Address 8 |
32
|
A9
|
A9
|
Address 9 |
33
|
/RAS3
|
/RAS3
|
Row Address Strobe 3 |
34
|
/RAS2
|
/RAS2
|
Row Address Strobe 2 |
35
|
n/c
|
PQ3
|
Parity bit 3 (for the 3rd byte, bits 16-23)
|
36
|
n/c
|
PQ1
|
Parity bit 1 (for the 1st byte, bits 0-7)
|
37
|
n/c
|
PQ2
|
Parity bit 2 (for the 2nd byte, bits 8-15)
|
38
|
n/c
|
PQ4
|
Parity bit 4 (for the 4th byte, bits 24-31)
|
39
|
VSS
|
VSS
|
Ground
|
40
|
/CAS0
|
/CAS0
|
Column Address Strobe 0 |
41
|
/CAS2
|
/CAS2
|
Column Address Strobe 2 |
42
|
/CAS3
|
/CAS3
|
Column Address Strobe 3 |
43
|
/CAS1
|
/CAS1
|
Column Address Strobe 1 |
44
|
/RAS0
|
/RAS0
|
Row Address Strobe 0 |
45
|
/RAS1
|
/RAS1
|
Row Address Strobe 1 |
46
|
n/c
|
n/c
|
Not connected
|
47
|
/WE
|
/WE
|
Read/Write
|
48
|
n/c
|
n/c
|
Not connected
|
49
|
DQ8
|
DQ8
|
Data 8 |
50
|
DQ24
|
DQ24
|
Data 24
|
51
|
DQ9
|
DQ9
|
Data 9 |
52
|
DQ25
|
DQ25
|
Data 25
|
53
|
DQ10
|
DQ10
|
Data 10
|
54
|
DQ26
|
DQ26
|
Data 26
|
55
|
DQ11
|
DQ11
|
Data 11
|
56
|
DQ27
|
DQ27
|
Data 27
|
57
|
DQ12
|
DQ12
|
Data 12
|
58
|
DQ28
|
DQ28
|
Data 28
|
59
|
VCC
|
VCC
|
+5 VDC
|
60
|
DQ29
|
DQ29
|
Data 29
|
61
|
DQ13
|
DQ13
|
Data 13
|
62
|
DQ30
|
DQ30
|
Data 30
|
63
|
DQ14
|
DQ14
|
Data 14
|
64
|
DQ31
|
DQ31
|
Data 31
|
65
|
DQ16
|
DQ16
|
Data 16
|
66
|
n/c
|
n/c
|
Not connected
|
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
|
n/c
|
Not connected
|
72
|
VSS
|
VSS
|
Ground
|
Size:
PD2
|
PD1
|
Size |
GND
|
GND
|
4 or 64 MB
|
GND
|
NC
|
2 or 32 MB
|
NC
|
GND
|
1 or 16 MB
|
NC
|
NC
|
8 MB
|
Accesstime:
PD4
|
PD3
|
Accesstime |
GND
|
GND
|
50, 100 ns
|
GND
|
NC
|
80 ns
|
NC
|
GND
|
70 ns
|
NC
|
NC
|
60 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. | |