SCSI Internal (Single-ended)

SCSI=Small Computer System Interface

Based on an original design by Shugart Associates. SCSI was ratified in 1986.

Pinout

50 PIN IDC MALE at the controller & harddisk.

50 PIN IDC FEMALE at the cable.

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

Note: Direction is Device relative Bus (other Devices).

All odd-numbered pins, except pin 25, are connected to ground. Pin 25 is left open.

Contributions

• Joakim Ögren