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SCSI Internal (2.5 inch) pinout

pinout

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

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

40 pin IDC female connector diagram
40 pin IDC female connector  at the cable (0.75

Source:www.pinouts.ru