plug to use with the port illustrated. !!
Apple Desktop Bus (ADB)
Pin Signal name Signal description
1 ADB Data
2 NC Reserved
3 +5v +5 V DC
4 GND Signal ground
- Connector type: 4-pin minicircular
- Total length of all cables not to exceed 5 m (16 ft.)
Modem and printer ports
Pin Signal name Signal description
1 HSKo Handshake out
2 HSKi Handshake in/external clock
3 TXD- Transmit data -
4 GND Signal ground
5 RXD- Receive data -
6 TXD+ Transmit data +
7 NC No connection
8 RXD+ Receive data +
- Connector type: 8-pin minicircular
SCSI port
Pin Signal name Signal description
1 REQ/ Request
2 MSG/ Message
3 I/O/ Input/Output
4 RST/ SCSI bus reset
5 ACK/ Acknowledge
6 BSY/ Busy
7 GND Signal ground
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