# SCSI Internal (Differential)

(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
--- | --- | --- | ---
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 Pariy7
19 | +DBP |  | +Data Bus Parity (odd Parity)
20 | -DBP |  | -Data Bus Pariy (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