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SCSI Internal (Single-ended) connector

pinout

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

50 pin IDC male connector layout
50 pin IDC male connector  at the controller & harddisk
Pin Name Dir Description
2DB0<->Data Bus 0
4DB1<->Data Bus 1
6DB2<->Data Bus 2
8DB3<->Data Bus 3
10DB4<->Data Bus 4
12DB5<->Data Bus 5
14DB6<->Data Bus 6
16DB7<->Data Bus 7
18PARITY<->Data Parity (odd Parity)
20GND---Ground
22GND---Ground
24GND---Ground
26TMPWR<->Termination Power
28GND---Ground
30GND---Ground
32/ATN<--Attention
34GND---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

Note: Direction is Device relative Bus (other Devices).
All odd-numbered pins, except pin 25, are connected to ground. Pin 25 is left open.

50 pin IDC female connector diagram
50 pin IDC female connector  at the cable

Source:www.pinouts.ru

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