Connector - Apple Macintosh XL Serial A25 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 | RTS | Request To Send | | 5 | CTS | Clear To Send | | 6 | DSR | Data Set Ready | | 7 | GND | Ground | | 8 | DCD | Data Carrier Detect | | 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 | TxC | Connected to TRxCA | | 16 | n/c | Not connected | | 17 | RxC | Connected to RTxCA | | 18 | n/c | Not connected | | 19 | n/c | Not connected | | 20 | n/c | Not connected | | 21 | n/c | Not connected | | 22 | n/c | Not connected | | 23 | n/c | Not connected | | 24 | TEXT | Connected to TRxCA | | 25 | n/c | Not connected |
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