SCSI Internal (Single-ended)

(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
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

SCSI Internal (Differential)

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

SCSI-II External Hi D-Sub (Single-ended)

(At the controller & devices).
 

(To the cable)

50 PIN HI-DENSITY D-SUB FEMALE at the controller & devices.
50 PIN HI-DENSITY D-SUB MALE at the cable.
 

Pin	Name	Dir	Description
1-25	GND	------	Ground
26	DB0	< >	Data Bus 0
27	DB1	< >	Data Bus 1
28	DB2	< >	Data Bus 2
29	DB3	< >	Data Bus 3
30	DB4	< >	Data Bus 4
31	DB5	< >	Data Bus 5
32	DB6	< >	Data Bus 6
33	DB7	< >	Data Bus 7
34	PARITY	< >	Data Parity (odd Parity)
35	GND	------	Ground
36	GND	------	Ground
37	GND	------	Ground
38	TMPWR	< >	Termination Power
39	GND	------	Ground
40	GND	------	Ground
41	/ATN	<	Attention
42	n/c	-	Not connected
43	/BSY	< >	Busy
44	/ACK	<	Acknowledge
45	/RST	< >	Reset
46	/MSG	>	Message
47	/SEL	< >	Select
48	/C/D	>	Control/Data
49	/REQ	>	Request
50	/I/O	>	Input/Output

 

SCSI-II External Hi D-Sub (Differential)

(At the controller & devices)

(To the cable)

50 PIN HI-DENSITY D-SUB FEMALE at the controller & devices.
50 PIN HI-DENSITY D-SUB MALE at the cable.
 

Pin	Name	Dir	Description
01	GND	-----	Ground
02	+DB0	< >	+Data Bus 0
03	+DB1	< >	+Data Bus 1
04	+DB2	< >	+Data Bus 2
05	+DB3	< >	+Data Bus 3
06	+DB4	< >	+Data Bus 4
07	+DB5	< >	+Data Bus 5
08	+DB6	< >	+Data Bus 6
09	+DB7	< >	+Data Bus 7
10	+DBP	< >	+Data Bus Parity (odd Parity)
11	DIFFSENS	?	???
12	res	-	Reserved
13	TERMPWR	< >	Termination Power
14	res	-	Reserved
15	+ATN	<	+Attention
16	GND	-----	Ground
17	+BSY	< >	+Bus is busy
18	+ACK	<	+Acknowledge
19	+RST	< >	+Reset
20	+MSG	>	+Message
21	+SEL	< >	+Select
22	+C/D	>	+Control or Data
23	+REQ	>	+Request
24	+I/O	>	+In/Out
25	GND	-----	Ground
26	GND	-----	Ground
27	-DB0	< >	-Data Bus 0
28	-DB1	< >	-Data Bus 1
29	-DB2	< >	-Data Bus 2
30	-DB3	< >	-Data Bus 3
31	-DB4	< >	-Data Bus 4
32	-DB5	< >	-Data Bus 5
33	-DB6	< >	-Data Bus 6
34	-DB7	< >	-Data Bus Parity7
35	-DBP	< >	-Data Bus Parity (odd Parity)
36	GND	-----	Ground
37	res	-	Reserved
38	TERMPWR	< >	Termination Power
39	res	-	Reserved
40	-ATN	<	-Attention
41	GND	-----	Ground
42	-BSY	< >	-Bus is busy
43	-ACK	<	-Acknowledge
44	-RST	< >	-Reset
45	-MSG	>	-Message
46	-SEL	< >	-Select
47	-C/D	>	-Control or Data
48	-REQ	>	-Request
49	-I/O	>	-In/Out
50	GND	-----	Ground

SCSI External D-Sub (PC/Amiga/Mac)

(At the controller)

At (the cable)

SCSI External D-Sub (Future Domain)

(At the controller)

(At the cable)

25 PIN D-SUB FEMALE at the controller.
25 PIN D-SUB MALE at the cable.
 

Pin	Name	Dir	Description
1	GND	-----	Ground
2	DB1	< >	Data Bus 1
3	DB3	< >	Data Bus 3
4	DB5	< >	Data Bus 5
5	DB7	< >	Data Bus 7
6	GND	-----	Ground
7	/SEL	< >	Select
8	GND	-----	Ground
9	TMPWR	< >	Termination Power
10	/RST	< >	Reset
11	C/D	>	Control/Data
12	I/O	>	Input/Output
13	GND	-----	Ground
14	DB0	< >	Data Bus 0
15	DB2	< >	Data Bus 2
16	DB4	< >	Data Bus 4
17	DB6	< >	Data Bus 6
18	PARITY	< >	Data Parity
19	GND	-----	Ground
20	/ATN	<	Attention
21	/MSG	>	Message
22	/ACK	<	Acknowledge
23	BSY	< >	Busy
24	/REQ	>	Request
25	GND	-----	Ground

Any information used is at your own risk.
Do take proper precautions when working with electronic parts,
some can hold electrical discharges
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