Dell Precision M4300 (Mid 2007) - Manual (Page 39)

Serial Connector
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S-Video
Pin Signal
1 GND
2 GND
3 DLUMA-L
4 DCRMA-L
Pin Signal Pin Signal
1 DCD 6 DSR
2 RXDA 7 RTS
3 TXDA 8 CTS
4 DTR 9 RI
5 GND