# Apple SCSI HDI-30

30 PIN UNKNOWN CONNECTOR

Pin | Name | Dir | Description
--- | --- | --- | ---
1 | n/c |  | Reserved for SCSI disk mode.
2 | /DB0 |  | Bit 0 of SCSI data bus
3 | GND |  | Ground
4 | /DB1 |  | Bit 1 of SCSI data bus
5 | TPWR |  | Termination power
6 | /DB2 |  | Bit 2 of SCSI data bus
7 | /DB3 |  | Bit 3 of SCSI data bus
8 | GND |  | Ground
9 | /ACKS |  | Handshake signal. When low acknowledges a request for data transfer
10 | GND |  | Ground
11 | /DB4 |  | Bit 4 of SCSI data bus
12 | GND |  | Ground
13 | GND |  | Ground
14 | /DB5 |  | Bit 5 of SCSI data bus
15 | GND |  | Ground
16 | /DB6 |  | Bit 6 of SCSI data bus
17 | GND |  | Ground
18 | /DB7 |  | Bit 7 of SCSI data bus
19 | /DBP |  | SCSI data bus parity bit
20 | GND |  | Ground
21 | /REQ |  | Request for a data transfer
22 | GND |  | Ground
23 | /BSY |  | When active (low) indicates that the SCSI data bus is busy
24 | GND |  | Ground
25 | /ATN |  | When active (low) indicates an attention condition
26 | /C/D |  | When active (low) indicates that data is on the SCSI bus. When high, indicates that control signals are on the bus
27 | /RST |  | SCSI bus reset
28 | /MSG |  | Indicates the message phase
29 | /SEL |  | SCSI select
30 | /I/O |  | Controls the direction of data output. When high, data is input

Note: Direction is Device relative Bus (other Devices).

Contributor: Joakim Ögren

Source:
Apple Tech Info Library 12929: Duo Dock/Duo Dock II, External Pinouts at Apple TIL homepage

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May be copied and redistributed, partially or in whole, as appropriate.
Document last modified: 2001-06-07