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Controlling monitor with Microcontroller

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you can view a video project on www.8052.com it uses a 8051 to show text ona display,
VGA to be exact
 

I have search VGA specification and began to understand how VGA works.
What i can't get is the voltage specification for the R,G,and B Channel. It's analog channel so what is the maximum value of that channel... i want to use R2R ladder with volt divider so i must know the maximum voltage to decide the value of the resistor.
Can someone give me some references about the voltage value of each color channel?

Thanks a lot for the attention.
Best Regards
 

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