Hardware pinouts information and cables schemes

SCSI Internal (Single-ended) pinout

hard drive connector

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SCSI=Small Computer System Interface. Based on an original design by Shugart Associates. SCSI was ratified in 1986.

50 pin IDC male connector layout

50 pin IDC male connector
at the controller & harddisk



Pin Name Dir Description
2DB0<->Data Bus 0
4DB1<->Data Bus 1
6DB2<->Data Bus 2
8DB3<->Data Bus 3
10DB4<->Data Bus 4
12DB5<->Data Bus 5
14DB6<->Data Bus 6
16DB7<->Data Bus 7
18PARITY<->Data Parity (odd Parity)
20GND---Ground
22GND---Ground
24GND---Ground
26TMPWR<->Termination Power
28GND---Ground
30GND---Ground
32/ATN<--Attention
34GND---Ground
36/BSY<->Busy
38/ACK<--Acknowledge
40/RST<->Reset
42/MSG-->Message
44/SEL<->Select
46/C/D-->Control/Data
48/REQ-->Request
50/I/O-->Input/Output

Note: Direction is Device relative Bus (other Devices).
All odd-numbered pins, except pin 25, are connected to ground. Pin 25 is left open.


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Pinouts.ru > Hard drives connectors pinouts listing >  Pinout of SCSI Internal (Single-ended) and layout of 50 pin IDC male connector and 50 pin IDC female connector
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Source(s) of this and additional information: Hardware Book 1 reports
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