Connector - Apple Macintosh XL Serial B25 PIN D-SUB CONNECTOR| Pin | 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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