# 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 Pariy7
35 | -DBP |  | -Data Bus Pariy (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