# 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