Macintosh Serial

From HwB

Available on Macintosh Mac 512KE and earlier.



9 PIN D-SUB FEMALE at the computer.


9 PIN D-SUB MALE at the mouse cable.

Pin Name Dir Description
1 GND Arrow.png Ground
2 +5V Arrowr.png +5 VDC. Don't use this one, it may be converted into output handshake in later equipment.
3 GND Arrow.png Ground
4 Tx+ Arrowr.png Transmit Data, positive going component
5 Tx- Arrowr.png Transmit Data, negative going component
6 +12V Arrowr.png +12 VDC
7 DSR/HSK Arrowl.png Handshake input. Signal name depends on mode: Used for Flow Control or Clock In.
8 Rx+ Arrowl.png Receive Data, positive going component
9 Rx- Arrowl.png Receive Data, negative going component

Note: Direction is Computer relative Equipment.



  • Apple Tech Info Library, Article ID: TECHINFO-0001424