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pinout (распиновка)

Macintosh Serial connector

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Available on Macintosh Mac 512KE and earlier.

9 pin D-SUB FEMALE connector  at the computer
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

9 pin D-SUB MALE connector  at the mouse cable

Note: Direction is Computer relative Equipment.

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