Connecting External Options
Table 7 shows the pin-number assignments for the 68-pin SCSI
connectors.
Table 7. The 68-Pin SCSI Port Connector Pin-Number Assignments
Pin
Signal
Pin
Signal
1
Ground
35
Data 12
2
Ground
36
Data 13
3
Ground
37
Data 14
4
Ground
38
Data 15
5
Ground
39
Data P1
6
Ground
40
Data 0
7
Ground
41
Data 1
8
Ground
42
Data 2
9
Ground
43
Data 3
10
Ground
44
Data 4
11
Ground
45
Data 5
12
Ground
46
Data 6
13
Ground
47
Data 7
14
Ground
48
Data P0
15
Ground
49
Reserved
16
Ground
50
-PRSN
17
Terminal power
51
Terminal power
18
Terminal power
52
Terminal power
19
Reserved
53
Reserved
20
Ground
54
Ground
21
Ground
55
-Attention
22
Ground
56
Ground
23
Ground
57
-Busy
24
Ground
58
-Acknowledge
25
Not connected
59
-Reset
26
Ground
60
-Message
27
Ground
61
-Select
28
Ground
62
-Control/Data
29
Ground
63
-Request
30
Ground
64
-Input/Output
31
Ground
65
Data 8
32
Ground
66
Data 9
33
Ground
67
Data 10
34
Ground
68
Data 11
Chapter 4. Installing Options
105
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