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SCSI Internal (2.5 inch) pinout

layout
schematic diagram
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40 pin IDC MALE connector pin-out & layout
40 pin IDC MALE connector  at the controller & peripherals (0.75
Pin Name Dir Description
1 +5V --- +5 VDC
1 +5V --- +5 VDC
1 RET --- Return (Ground?)
1 RET --- Return (Ground?)
1 GND <-> Ground
2 DB0 <-> Data Bus 0
1 GND <-> Ground
4 DB1 <-> Data Bus 1
1 GND <-> Ground
6 DB2 <-> Data Bus 2
1 GND <-> Ground
8 DB3 <-> Data Bus 3
1 GND <-> Ground
10 DB4 <-> Data Bus 4
1 GND <-> Ground
12 DB5 <-> Data Bus 5
1 GND <-> Ground
14 DB6 <-> Data Bus 6
1 GND <-> Ground
16 DB7 <-> Data Bus 7
1 GND <-> Ground
18 PARITY <-> Data Parity (odd Parity)
24 GND --- Ground
26 TMPWR <-> Termination Power
32 /ATN <-- Attention
36 /BSY <-> Busy
24 GND --- Ground
38 /ACK <-- Acknowledge
40 /RST <-> Reset
42 /MSG --> Message
24 GND --- Ground
44 /SEL <-> Select
50 /I/O --> Input/Output
46 /C/D --> Control/Data
24 GND --- Ground
48 /REQ --> Request
1 RET --- Return (Ground?)
1 RET --- Return (Ground?)
1 +5V --- +5 VDC
1 +5V --- +5 VDC

Note: Direction is Device relative Bus (other Devices). Connector is: AMP 6-176135.

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40 pin IDC FEMALE connector pin-outs & layouts
40 pin IDC FEMALE connector  at the cable (0.75
Pinouts.ru > Pinouts of different harddrives connectors >  Pinout of SCSI Internal (2.5 inch) and layout of 40 pin IDC MALE connector and 40 pin IDC FEMALE connector

Source(s): Electrical Interface Spec for IBM DPRS-20810 and DPRS-21215 at IBM Hard disk drive support
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