SCSI = Small Computer System Interface
Based on an original design by Shugart Associates. SCSI was ratified in 1986.
50 PIN IDC MALE at the controller &
harddisk
50 PIN IDC FEMALE at the cable
| Pin | Name | Dir | Description |
|---|---|---|---|
| 2 | DB0 | IN/OUT | Data Bus 0 |
| 4 | DB1 | IN/OUT | Data Bus 1 |
| 6 | DB2 | IN/OUT | Data Bus 2 |
| 8 | DB3 | IN/OUT | Data Bus 3 |
| 10 | DB4 | IN/OUT | Data Bus 4 |
| 12 | DB5 | IN/OUT | Data Bus 5 |
| 14 | DB6 | IN/OUT | Data Bus 6 |
| 16 | DB7 | IN/OUT | Data Bus 7 |
| 18 | PARITY | IN/OUT | Data Parity (odd Parity) |
| 20 | GND | - | Ground |
| 22 | GND | - | Ground |
| 24 | GND | - | Ground |
| 26 | TMPWR | IN/OUT | Termination Power |
| 28 | GND | - | Ground |
| 30 | GND | - | Ground |
| 32 | /ATN | IN | Attention |
| 34 | GND | - | Ground |
| 36 | /BSY | IN/OUT | Busy |
| 38 | /ACK | IN | Acknowledge |
| 40 | /RST | IN/OUT | Reset |
| 42 | /MSG | OUT | Message |
| 44 | /SEL | IN/OUT | Select |
| 46 | /C/D | OUT | Control/Data |
| 48 | /REQ | OUT | Request |
| 50 | /I/O | OUT | Input/Output |
Notes
- Direction is Device relative Bus (other Devices).
- All odd-numbered pins, except pin 25, are connected to ground. Pin 25 is left open.
- For more informations, references and sources go to SCSI Technology