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SCSI
Interface
Sub D-50
Pin
Signal
Pin
24
Ground
I/O+
25
Ground
Ground
26
D0-
Ground
27
D1-
D0-
28
D2-
D1-
29
D3-
D2-
30
D4-
D3-
31
D5-
D4-
32
D6-
D5-
33
D7-
D6-
34
DPAR-
D7-
35
Ground
DPAR-
36
Ground
Ground
37
Reserved
Reserved
38
TRMPWR
TRMPWR
39
Reserved
Reserved
40
Ground
Ground
41
ATN-
ATN-
42
Ground
Ground
43
Busy
Busy
44
ACK-
ACK-
45
RST-
RST-
46
MSG-
MSG-
47
SEL-
SEL-
48
C/D-
C/D-
49
REQ-
REQ-
50
I/O-
I/O-
SCSI
Interface
Cable
DB-25
Pin
Signal
Pin
Signal
1
Ground
26
Terminator Power
2
Data Line 0
27
Ground
3
Ground
28
Ground
4
Data Line 1
29
Ground
5
Ground
30
Ground
6
Data Line 2
31
Ground
7
Ground
32
Attention
8
Data Line 3
33
Ground
9
Ground
34
Ground
10
Data Line 4
35
Ground
11
Ground
36
Busy
12
Data Line 5
37
Ground
13
Ground
38
Acknowledge
14
Data Line 6
39
Ground
15
Ground
40
Reset
16
Data Line 7
41
Ground
17
Ground
42
Message
18
Data Parity Line
43
Ground
19
Ground
44
Select
20
Ground
45
Ground
21
Ground
46
C/D
22
Ground
47
Ground
23
Ground
48
Request
24
Ground
49
Ground
25
NC
50
I/O
SCSI
Micro D-68
Pin
Signal
1
Ground
2
Ground
3
Ground
4
Ground
5
Ground
6
Ground
7
Ground
8
Ground
9
Ground
10
Ground
11
Ground
12
Ground
13
Ground
14
Ground
15
Ground
16
Ground
17
TRMPWR
18
TRMPWR
19
Reserved
20
Ground
21
Ground
22
Ground
23
Ground
24
Ground
25
Ground
26
Ground
27
Ground
28
Ground
29
Ground
30
Ground
31
Ground
32
Ground
SCSI
Micro D-68
Pin
Signal
33
Ground
34
Ground
35
D12-
36
D13-
37
D14-
38
D15-
39
DPAR-
40
D0-
41
D1-
42
D2-
43
D3-
44
D4-
45
D5-
46
D6-
47
D7-
48
DPAR-
49
Ground
50
Ground
51
TRMPWR
52
TRMPWR
53
Reserved
54
Ground
55
ATN-
56
Ground
57
BSY-
58
ACK-
59
RST-
60
MSG-
61
SEL-
62
C/D-
63
REQ-
64
I/O-
SCSI
Micro D-68
Pin
Signal
65
D8-
66
D9-
67
D10-
68
D11-

The Small Computer System Interface (SCSI) is a set of parallel interface standards developed by the American National Standards Institute (ANSI) for attaching printers, disk drives, scanners and other peripherals to computers. SCSI (pronounced "skuzzy") is supported by all major operating systems