30 pin Apple HDI-30
connector at the Apple computer, looking into cable-side
connector.
This connector is found on the SCSI Disk adapter cable.
| Pin | Name | Dir | Description | Notes |
|---|---|---|---|---|
| 1 | SCSI-Mode | SCSI disk mode enable signal | Reserved for SCSI disk mode. | |
| 2 | Data0 | IN/OUT | Data bit 0 | Bit 0 of SCSI data bus |
| 3 | GND | - | Signal ground | Ground |
| 4 | Data1 | IN/OUT | Data bit 1 | Bit 1 of SCSI data bus |
| 5 | Termpwr +5 volts | IN/OUT | termination power | Termination power |
| 6 | Data2 | IN/OUT | Data bit 2 | Bit 2 of SCSI data bus |
| 7 | Data3 | IN/OUT | Data bit 3 | Bit 3 of SCSI data bus |
| 8 | GND | - | Signal ground | Ground |
| 9 | ACK | IN | Acknowledge | Handshake signal. When low acknowledges a request for data transfer |
| 10 | GND | - | Signal ground | Ground |
| 11 | Data4 | IN/OUT | Data bit 4 | Bit 4 of SCSI data bus |
| 12 | GND | - | Signal ground | Ground |
| 13 | GND | - | Signal ground | Ground |
| 14 | Data5 | IN/OUT | Data bit 5 | Bit 5 of SCSI data bus |
| 15 | GND | - | Signal ground | Ground |
| 16 | Data6 | IN/OUT | Data bit 6 | Bit 6 of SCSI data bus |
| 17 | GND | - | Signal ground | Ground |
| 18 | Data7 | IN/OUT | Data bit 7 | Bit 7 of SCSI data bus |
| 19 | PARITY | IN/OUT | Data parity | SCSI data bus parity bit |
| 20 | GND | - | Signal ground | Ground |
| 21 | REQ | OUT | Request | Request for a data transfer |
| 22 | GND | - | Signal ground | Ground |
| 23 | BUSY | IN/OUT | Busy | When active (low) indicates that the SCSI data bus is busy |
| 24 | GND | - | Signal ground | Ground |
| 25 | ATN | IN | Attention | When active (low) indicates an attention condition |
| 26 | C/D | OUT | Control/data | When active (low) indicates that data is on the SCSI bus. When high, indicates that control signals are on the bus |
| 27 | RST | IN/OUT | Reset | SCSI bus reset |
| 28 | MSG | OUT | Message | Indicates the message phase |
| 29 | SEL | IN/OUT | Select | SCSI select |
| 30 | I/O | OUT | Input/output | Controls the direction of data output. When high, data is input |