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

25 PIN D-SUB FEMALE (At the controller)
25 PIN D-SUB MALE (At the cable)

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

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

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

Source: [The Hardware Book]

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