This page provides the SCSI bus interface as found on an Apple computer [Macintosh] over a 30-pin HDI connector. A description is provided along with the pinouts. This interface is no longer used on current production models. No electrical standards or cabling information is provided here; refer to the main SCSI Bus page which provides a detailed description of the SCSI bus interface and additional pinout options. The term SCSI stands for Small Computer Systems Interface.
Follow these links to Connector manufacturers, or Cable manufacturers, and a list of Cable Assemblies manufacturers.
The Apple Computer HDI-30 SCSI Pin out and Signal names on a HDI (Square) connector.
HDI stands for High Density Interconnect [HDI also comes in additional pin configurations]
Used on LaserWriter 12/600, LaserWrite Pro 630, and Apple Macintosh PowerBooks (as an External Connector)
| Pin # | Pin Name | Pin Description |
|---|---|---|
| 1 | Open | Open Line |
| 2 | /DB0 | SCSI Bit 0 |
| 3 | GND | GROUND |
| 4 | /DB1 | SCSI Bit 1 |
| 5 | Open | Open Line |
| 6 | /DB2 | SCSI Bit 2 |
| 7 | /DB3 | SCSI Bit 3 |
| 8 | GND | GROUND |
| 9 | /ACK | Acknowledge |
| 10 | GND | GROUND |
| 11 | /DB4 | SCSI Bit 4 |
| 12 | GND | GROUND |
| 13 | GND | GROUND |
| 14 | /DB5 | SCSI Bit 5 |
| 15 | GND | GROUND |
| 16 | /DB6 | SCSI Bit 6 |
| 17 | GND | GROUND |
| 18 | /DB7 | SCSI Bit 7 |
| 19 | /DBP | Parity Bit |
| 20 | GND | GROUND |
| 21 | /REQ | Request for Data |
| 22 | GND | GROUND |
| 23 | /BSY | Busy when low |
| 24 | GND | GROUND |
| 25 | /ATN | Attention |
| 26 | /C/D | Low, Data on Bus. High, Control on Bus |
| 27 | /RST | SCSI Bus Reset |
| 28 | /MSG | Message phase is active |
| 29 | /SEL | Select |
| 30 | /I/O | Indicates direction of data |
Engineering Key words: Apple, Macintosh, MAC, ImageWriter, LaserWriter, AppleTalk, AppleLine, SCSI, Expansion, Computer Buses, Connector Pin-Outs, Interface Standard, Specification, Spec, Physical Interface, Description, Personal Computer Interface, Peripheral, Printer Interface, Keyboard Pin Assignment, Obsolete, Out of Production.
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