Obsolete hardware connectors pinouts

SCSI Centronics 50 pin (Differential) pinout

hard drive connector

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50 pin Amphenol female connector layout
50 pin Amphenol female connector
at the controller & devices

use RJ-21 (or RJ21) registered jack standard connector, also known as a 50-pin telco connector, or an Amphenol connector.

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 Parity7
35 -DBP <-> -Data Bus Parity (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
Note: Direction is Device relative Bus (other Devices)

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50 pin Amphenol male connector layout
50 pin Amphenol male connector
at the cable
Source(s) of this and additional information: Hardware Book, Karsten Wenke
This information should be correct, but we are not sure.
Is this document CORRECT or INCORRECT?.
Pinouts.ru >  HDD connectors pinouts >  Pinout of SCSI Centronics 50 pin (Differential) and layout of 50 pin Amphenol female connector and 50 pin Amphenol male connector. Is this document correct or incorrect?
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Last updated 2011-10-08 22:26:04. Edit this page.
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