Piedinature - Pinouts
SCSI Internal (Single-ended)

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Reference and Sources:

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


(50 PIN IDC MALE at the controller & harddisk)


(50 PIN IDC FEMALE at the cable)

Pin Name Dir Description
2 DB0 IN/OUT Data Bus 0
4 DB1 IN/OUT Data Bus 1
6 DB2 IN/OUT Data Bus 2
8 DB3 IN/OUT Data Bus 3
10 DB4 IN/OUT Data Bus 4
12 DB5 IN/OUT Data Bus 5
14 DB6 IN/OUT Data Bus 6
16 DB7 IN/OUT Data Bus 7
18 PARITY IN/OUT Data Parity (odd Parity)
20 GND ------ Ground
22 GND ------ Ground
24 GND ------ Ground
26 TMPWR IN/OUT Termination Power
28 GND ------ Ground
30 GND ------ Ground
32 /ATN IN Attention
34 GND ------ Ground
36 /BSY IN/OUT Busy
38 /ACK IN Acknowledge
40 /RST IN/OUT Reset
42 /MSG OUT Message
44 /SEL IN/OUT Select
46 /C/D OUT Control/Data
48 /REQ OUT Request
50 /I/O OUT 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.

For more informations, references and sources go to


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