Piedinature - Pinouts
Macintosh Serial

Available on Macintosh Mac 512KE and earlier.

9 PIN D-SUB FEMALE (At the Computer)

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

Note: Direction is Computer relative Equipment.

Piedinature - PinoutsMacintosh Serial