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

Note: Direction is Device relative Bus (other Devices)

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Source(s) of this and additional information: Apple Tech Info Library 12929: Duo Dock/Duo Dock II, External Pinouts at Apple TIL homepage
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