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I am not powering the screen through the power supply. Right now I have the composite out hooked up to a TV for debugging purposes.

Hmmm, I'm not using batteries. I have the board hooked up to a 9V 500mA power supply.

I am using Ben's guide to create a portable Atari 2600. I have completed the modifications up to the point of having composite video output (no switches or controllers hooked up yet). On power up, I get good video through the composite output for about one minute, then the screen starts to roll for ...