SCSI Internal (Differential)

 (at the controller & harddisk.)
 (at the cable.)

50 PIN IDC MALE at the controller & harddisk.
50 PIN IDC FEMALE at the cable.

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 Parity7
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

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