Pinouts of Connectors

SCSI-II External Hi D-Sub (Single-ended) connector pinout

layout
schematic diagram
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50 pin HI-DENSITY D-SUB FEMALE connector pin-out & layout
50 pin HI-DENSITY D-SUB FEMALE connector  at the controller & devices
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

Note: Direction is Device relative Bus (other Devices)

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50 pin HI-DENSITY D-SUB MALE connector pin-outs & layouts
50 pin HI-DENSITY D-SUB MALE connector  at the cable
Pinouts.ru > Pinouts of different harddrives connectors >  Pinout of SCSI-II External Hi D-Sub (Single-ended) connector and layout of 50 pin HI-DENSITY D-SUB FEMALE connector and 50 pin HI-DENSITY D-SUB MALE connector

Source(s): Hardware Book
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