Connector - Macintosh SerialAvailable on Macintosh Mac 512KE and earlier.9 PIN D-SUB FEMALE at the computer. 9 PIN D-SUB MALE at the mouse cable.  | (at the Computer) |  | (at the Equipment) |
Pin | Name | Direction | Description |
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1 | GND | --- | Ground | 2 | +5V | Output | +5 VDC. Don't use this one, it may be converted into output handshake in later equipment. | 3 | GND | --- | Ground | 4 | Tx+ | Output | Transmit Data, positive going component | 5 | Tx- | Output | Transmit Data, negative going component | 6 | +12V | Output | +12 VDC | 7 | DSR/HSK | Input | Handshake input. Signal name depends on mode: Used for Flow Control or Clock In. | 8 | Rx+ | Input | Receive Data, positive going component | 9 | Rx- | Input | Receive Data, negative going component |
Note: Direction is Computer relative Equipment.
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