Pinouts of Connectors

SCSI Internal (Differential) connector pinout

layout
schematic diagram
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50 pin IDC MALE connector pin-out & layout
50 pin IDC MALE connector  at the controller & harddisk
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 Parity7
19 +DBP <-> +Data Bus Parity (odd Parity)
20 -DBP <-> -Data Bus Parity (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

Note: Direction is Device relative Bus (other Devices)

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50 pin IDC FEMALE connector pin-outs & layouts
50 pin IDC FEMALE connector  at the cable
Pinouts.ru > Pinouts of different harddrives connectors >  Pinout of SCSI Internal (Differential) connector and layout of 50 pin IDC MALE connector and 50 pin IDC FEMALE connector

Source(s): Hardware Book, Karsten Wenke
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