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30 pin Apple HDI-30 connector layout
30 pin Apple HDI-30 connector
at the Apple computer, looking into cable-side connector
these connectors are found on the SCSI Disk adapter cable
Pin Name Dir Description  
1SCSI-Mode SCSI disk mode enable signalReserved for SCSI disk mode.
2Data0<->Data bit 0Bit 0 of SCSI data bus
3GND---Signal groundGround
4Data1<->Data bit 1Bit 1 of SCSI data bus
5Termpwr +5 volts<->termination powerTermination power
6Data2<->Data bit 2Bit 2 of SCSI data bus
7Data3<->Data bit 3Bit 3 of SCSI data bus
8GND---Signal groundGround
9ACK<--AcknowledgeHandshake signal. When low acknowledges a request for data transfer
10GND---Signal groundGround
11Data4<->Data bit 4Bit 4 of SCSI data bus
12GND---Signal groundGround
13GND---Signal groundGround
14Data5<->Data bit 5Bit 5 of SCSI data bus
15GND---Signal groundGround
16Data6<->Data bit 6Bit 6 of SCSI data bus
17GND---Signal groundGround
18Data7<->Data bit 7Bit 7 of SCSI data bus
19PARITY<->Data paritySCSI data bus parity bit
20GND---Signal groundGround
21REQ-->RequestRequest for a data transfer
22GND---Signal groundGround
23BUSY<->BusyWhen active (low) indicates that the SCSI data bus is busy
24GND---Signal groundGround
25ATN<--AttentionWhen active (low) indicates an attention condition
26C/D-->Control/dataWhen active (low) indicates that data is on the SCSI bus. When high, indicates that control signals are on the bus
27RST<->ResetSCSI bus reset
28MSG-->MessageIndicates the message phase
29SEL<->SelectSCSI select
30I/O-->Input/outputControls the direction of data output. When high, data is input
Note: Direction is Device relative Bus (other Devices)
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