Connector - Apple Macintosh XL Serial B25 PIN D-SUB CONNECTORPin | Name | Description |
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1 | GND | Ground | 2 | TxD- | Transmit Data line | 3 | RxD- | Receive Data line | 4 | n/c | Not connected | 5 | n/c | Not connected | 6 | HSK/DSR | TRxCB or CTSB | 7 | GND | Ground | 8 | n/c | Not connected | 9 | n/c | Not connected | 10 | n/c | Not connected | 11 | n/c | Not connected | 12 | n/c | Not connected | 13 | n/c | Not connected | 14 | n/c | Not connected | 15 | n/c | Not connected | 16 | n/c | Not connected | 17 | n/c | Not connected | 18 | n/c | Not connected | 19 | RxD+ | Receive Data line | 20 | TxD+/DTR | Connected to DTRB | 21 | n/c | Not connected | 22 | n/c | Not connected | 23 | n/c | Not connected | 24 | n/c | Not connected | 25 | n/c | Not connected |
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