for 6600GT and others
Nvidia Geforce 6600GT Pin Pin
1 CHROMA (C) Input May be S-video luminance IN/CVBS IN (checked on a GT-N66T128VP card)
3 GND  
4 I2C SDA - I2C Data I/O  
5 Pb Output/COMPOSITE (CVBS) Output  
6 GND  
7 LUMA (Y)  
8 I2C SCL - I2C Clock Output  
9 CHROMA (C)/Pr Output  

The source did not specify if this is the female (connector on card) or male (cable) schematics. Im guessing female, though.

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9 pin mini-din female connector layout
9 pin mini-din female connector
at the Nvidia Geforce 6600GT