SCSI=Small Computer System Interface. Based on an original design by Shugart Associates. SCSI was ratified in 1986.

 

SCSI Single-ended

Pin Name Dir Description
2 DB0 <-> Data Bus 0
4 DB1 <-> Data Bus 1
6 DB2 <-> Data Bus 2
8 DB3 <-> Data Bus 3
10 DB4 <-> Data Bus 4
12 DB5 <-> Data Bus 5
14 DB6 <-> Data Bus 6
16 DB7 <-> Data Bus 7
18 PARITY <-> Data Parity (odd Parity)
20 GND --- Ground
22 GND --- Ground
24 GND --- Ground
26 TMPWR <-> Termination Power
28 GND --- Ground
30 GND --- Ground
32 /ATN <-- Attention
34 GND --- Ground
36 /BSY <-> Busy
38 /ACK <-- Acknowledge
40 /RST <-> Reset
42 /MSG --> Message
44 /SEL <-> Select
46 /C/D --> Control/Data
48 /REQ --> Request
50 /I/O --> Input/Output
Pin Name Dir Description
01 GND --- Ground
02 GND --- Ground
03 +DB0 <-> +Data Bus 0
04 -DB0 <-> -Data Bus 0
05 +DB1 <-> +Data Bus 1
06 -DB1 <-> -Data Bus 1
07 +DB2 <-> +Data Bus 2
08 -DB2 <-> -Data Bus 2
09 +DB3 <-> +Data Bus 3
10 -DB3 <-> -Data Bus 3
11 +DB4 <-> +Data Bus 4
12 -DB4 <-> -Data Bus 4
13 +DB5 <-> +Data Bus 5
14 -DB5 <-> -Data Bus 5
15 +DB6 <-> +Data Bus 6
16 -DB6 <-> -Data Bus 6
17 +DB7 <-> +Data Bus 7
18 -DB7 <-> -Data Bus 7
19 +DBP <-> +Data Bus Parity (odd Parity)
20 -DBP <-> -Data Bus Parity (odd Parity)
21 DIFFSENS ? ???
22 GND --- Ground
23 res - Reserved
24 res - Reserved
25 TERMPWR <-> Termination Power
26 TERMPWR <-> Termination Power
27 res - Reserved
28 res - Reserved
29 +ATN <-- +Attention
30 -ATN <-- -Attention
31 GND --- Ground
32 GND --- Ground
33 +BSY <-> +Bus is busy
34 -BSY <-> -Bus is busy
35 +ACK <-- +Acknowledge
36 -ACK <-- -Acknowledge
37 +RST <-> +Reset
38 -RST <-> -Reset
39 +MSG --> +Message
40 -MSG --> -Message
41 +SEL <-> +Select
42 -SEL <-> -Select
43 +C/D --> +Control or Data
44 -C/D --> -Control or Data
45 +REQ --> +Request
46 -REQ --> -Request
47 +I/O --> +In/Out
48 -I/O --> -In/Out
49 GND --- Ground
50 GND --- Ground

-Control or Data

50 pin IDC male connector layout
50 pin IDC male connector
at the controller & harddisk
50 pin IDC female connector layout
50 pin IDC female connector
at the cable
According to 2 reports in our database (2 positive and 0 negative) this pinout should be correct.

Is this pinout
SCSI Internal visual pinout:
SCSI Internal  diagram
click to enlarge
Source(s) of this and additional information: Hardware Book, the pin number nomenclature for 50 PIN IDC needs correcting, also add keyway gap.
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