# Macintosh Serial

Available 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

Note: Direction is Computer relative Equipment.

Contributor: | Ben Harris

Source: | Apple Tech Info Library, Article ID: TECHINFO-0001424

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Document last modified: 2002-01-13