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

(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 | /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