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Serial port connector
Keyboard and Mouse connectors
External USB connectors
Pin Signal Name Description
1 DCD Data Carrier Detect1
2RXDATA Receive Data
3 TXDATA Transmit Data
4 DTR Data Terminal Ready
5 GND Ground
6DSR Data Set Ready
7 RTS Request To Send
8 CTS Clear To Send
9 RI Ring Indicate
Pin Signal Name
1 Keyboard (or mouse) data
2NC
3 GND
4+5 V
5 Keyboard (or mouse) clock
6NC
Pin Signal Name
1 +5 V
2USBN Data-
3 USBN Data+
4GND