2.4.1
SCSI connector pin assignments
In the table below, a minus sign indicates active low.
Signal name
Signal
pin number
Ground
pin number
DB(0)–
2
1
DB(1)–
4
3
DB(2)–
6
5
DB(3)–
8
7
DB(4)–
10
9
DB(5)–
12
11
DB(6)–
14
13
DB(7)–
16
15
DB(P)–
18
17
Ground
19–22
—
Reserved
23–25
—
Terminator power
26
—
Reserved
27–28
—
Ground
29–30
—
ATN–
32
31
Ground
33–34
—
BSY–
36
35
ACK–
38
37
RST–
40
39
MSG–
42
41
SEL–
44
43
C/D–
46
45
REQ–
48
47
I/O–
50
49
Caution. Do not connect pin 25 to ground. If you plug in the connector
upside down, the terminator power on pin 26 is shorted to
ground. This can damage the drive.
18
ST3655 Family SCSI Drives Product Manual, Rev. A
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