SCSI External D-Sub (PC/Amiga/Apple Macintosh) connector

#Computer#Harddisk interfaces
25 pin D-SUB FEMALE connector pin-out & layout

25 pin D-SUB FEMALE connector  at the controller

PinNameDirDescription
1/REQ-->Request
2/MSG-->Message
3I/O-->Input/Output
4/RST<->Reset
5/ACK<--Acknowledge
6BSY<->Busy
7GND---Ground
8DB0<->Data Bus 0
9GND---Ground
10DB3<->Data Bus 3
11DB5<->Data Bus 5
12DB6<->Data Bus 6
13DB7<->Data Bus 7
14GND---Ground
15C/D-->Control/Data
16GND---Ground
17/ATN<--Attention
18GND---Ground
19/SEL<->Select
20PARITY<->Data Parity
21DB1<->Data Bus 1
22DB2<->Data Bus 2
23DB4<->Data Bus 4
24GND---Ground
25TMPWR<->Termination Power
Caution: This interface uses the same type of connector as a standard RS-232 serial interface but is electrically very different. Do not connect RS-232 devices or cables to this port. Doing so can damage the device and the computer. Note: Direction is Device relative Bus (other Devices). Total length of all SCSI cables should not exceed 20 feet (6 meters).

SCSI External D-Sub (Future Domain) connector

SCSI External IBM Burndy connector