Great Pattern. This was very interesting. With TheatTek 2.1.1/NVidia 7800 I can see on pixel border. I am assuming that is zero overscan.
With MyHD 1080i, I did some adjusting. I can get to zero overscan horizontally, but the vertical never delivers the border, but it is close. Watching PBS-HD and some 4x3 content you can really see that some stations have not figured how to crop the broadcasts.
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