SCSI Pinout
Index
50-Pin Connector Pinout

Pin Number

Signal Name

Pin Number

Signal Name
1 GROUND 26 TERMPWR
2 DB (0) 27 NC
3 GROUND 28 NC
4 DB (1) 29 GROUND
5 GROUND 30 GROUND
6 DB (2) 31 GROUND
7 GROUND 32 ATN
8 DB (3) 33 GROUND
9 GROUND 34 GROUND
10 DB (4) 35 GROUND
11 GROUND 36 BSY
12 DB (5) 37 GROUND
13 GROUND 38 ACK
14 DB (6) 39 GROUND
15 GROUND 40 RST
16 DB (7) 41 GROUND
17 GROUND 42 MSG
18 DB (P) 43 GROUND
19 GROUND 44 SEL
20 DB (0) 45 GROUND
21 GROUND 46 C/D
22 GROUND 47 GROUND
23 NC 48 REQ
24 NC 49 GROUND
25 NC 50 I/O
Index
68-pin Single-Ended Contact Assignments (16-bit)
Pin Number

Signal Name

Pin Number Signal Name
1 GROUND 35 -DB(12)
2 GROUND 36 -DB(13)
3 GROUND 37 -DB(14)
4 GROUND 38 -DB(15)
5 GROUND 39 -DB(P1)
6 GROUND 49 -DB(0)
7 GROUND 41 -DB(1)
8 GROUND 42 -DB(2)
9 GROUND 43 -DB(3)
10 GROUND 44 -DB(4)
11 GROUND 45 -DB(5)
12 GROUND 46 -DB(6)
13 GROUND 47 -DB(7)
14 GROUND 48 -DB(P)
15 GROUND 49 GROUND
16 GROUND 50 GROUND
17 TERMPWR 51 TERMPWR
18 TERMPWR 52 TERMPWR
19 RESERVED 53 RESERVED
20 GROUND 54 GROUND
21 GROUND 55 -ATN
22 GROUND 56 GROUND
23 GROUND 57 -BSY
24 GROUND 58 -ACK
25 GROUND 59 -RST
26 GROUND 60 -MSG
27 GROUND 61 -SEL
28 GROUND 62 -C/D
29 GROUND 63 -REQ
30 GROUND 64 --I/O
31 GROUND 65 -DB(8)
32 GROUND 66 -DB(9)
33 GROUND 67 -DB(10)
34 GROUND 68 -DB(11)
Note: The minus sign next to a signal indicates active-low.
Index
68-Pin Wide Differential Connector Pinout

Pin Number

Signal Name

Pin Number

Signal Name
1 +DB (12) 35 -DB (12)
2 +DB (13) 36 -DB (13)
3 +DB (14) 37 -DB (14)
4 +DB (15) 38 -DB (15)
5 +DB (P1) 39 -DB (P1)
6 Ground 40 Ground
7 +DB (0) 41 -DB (0)
8 +DB (1) 42 -DB (1)
9 +DB (2) 43 -DB (2)
10 +DB (3) 44 -DB (3)
11 +DB (4) 45 -DB (4)
12 +DB (5) 46 -DB (5)
13 +DB (6) 47 -DB (6)
14 +DB (7) 48 -DB (7)
15 +DB (P) 49 -DB (P)
16 DIFFSENS 50 DIFFSENS
17 TERMPWR 51 TERMPWR
18 TERMPWR (P) 52 TERMPWR
19 RESERVED 53 RESERVED
20 +ATN 54 -ATN
21 GROUND 55 GROUND
22 +BSY 56 -BSY
23 +ASK 57 -ASK
24 +RST 58 -RST
25 +MSG 59 -MSG
26 +SEL 60 -SEL
27 +C/D 61 -C/D
28 +REQ 62 -REQ
29 +I/O 63 I/O
30 GROUND 64 GROUND
31 DB (8) 65 -DB (8)
32 +DB (9) 68 -DB (9)
33 +DB (10) 69 -DB (10)
34 +DB (11) 70 -DB (11)
Note: The minus sign next to a signal indicates active-low.
Index
80-Pin Single Connector Attachment Pinout

Pin Number

Signal Name

Pin Number

Signal Name
1 12 VOLT 41 12 volt GROUND
2 12 VOLT 42 12 volt GROUND
3 12 VOLT 43 12 volt GROUND
4 12 VOLT 44 12 volt GROUND
5 Reserved/NC 45 Reserved/NC
6 Reserved/NC 46 Reserved/NC
7 DB (11) 47 GROUND
8 DB (10) 48 GROUND
9 DB (9) 49 GROUND
10 DB (8) 50 GROUND
11 I/O 51 GROUND
12 REQ 52 GROUND
13 C/D 53 GROUND
14 SEL 54 GROUND
15 MSG 55 GROUND
16 RST 56 GROUND
17 ACK 57 GROUND
18 BSY 58 GROUND
19 ATN 59 GROUND
20 DB (PO) 60 GROUND
21 DB (7) 61 GROUND
22 DB (6) 62 GROUND
23 DB (5) 63 GROUND
24 DB (4) 64 GROUND
25 DB (3) 65 GROUND
26 DB (2) 66 GROUND
27 DB (1) 67 GROUND
28 DB (0) 68 GROUND
29 DB (P1) 69 GROUND
30 DB (15) 70 GROUND
31 DB (14) 71 GROUND
32 DB (13) 72 GROUND
33 DB (12) 73 GROUND
34 5 volt 74 5 volt GROUND
35 5 volt 75 5 volt GROUND
36 5 volt 76 5 volt GROUND
37 SYNC 77 ACTIVE LED OUT
38 RMT START 78 DLYD START
39 SCSI ID (0) 79 SCSI ID (1)
40 SCSI ID (2) 80 SCSI ID (3)
Index