# Macintosh Serial

Availble on Macintosh Mac 512KE and earlier.

(At the Computer)
(At the Equipment)

9 PIN D-SUB FEMALE at the computer.
9 PIN D-SUB MALE at the mouse cable.

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