Apple SCSI disk adapter connector

#Computer#Harddisk interfaces#Apple

These connectors are found on the SCSI Disk Adapter cable

30 pin Apple HDI-30 connector pin-out & layout

30 pin Apple HDI-30 connector  at the Apple computer, looking into cable-side connector

PinNameDirDescription
1n/c Reserved for SCSI disk mode.
2/DB0<->Bit 0 of SCSI data bus
3GND---Ground
4/DB1<->Bit 1 of SCSI data bus
5TPWR<->Termination power
6/DB2<->Bit 2 of SCSI data bus
7/DB3<->Bit 3 of SCSI data bus
8GND---Ground
9/ACKS<--Handshake signal. When low acknowledges a request for data transfer
10GND---Ground
11/DB4<->Bit 4 of SCSI data bus
12GND---Ground
13GND---Ground
14/DB5<->Bit 5 of SCSI data bus
15GND---Ground
16/DB6<->Bit 6 of SCSI data bus
17GND---Ground
18/DB7<->Bit 7 of SCSI data bus
19/DBP<->SCSI data bus parity bit
20GND---Ground
21/REQ-->Request for a data transfer
22GND---Ground
23/BSY<->When active (low) indicates that the SCSI data bus is busy
24GND---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)

Apple SCSI connector

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