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Alright, that makes sense. But why then is my picture in 640×480 cut off at the top? I tried with both Trident and Tseng VGA cards. Both have the same issue. I mean, I can’t set the V samplerate, so this is somehow implied? I think the mode shows as 525p on the OSSC, which means:
525 = 480 + backporch + frontporch + sync
V sync should be 2, so that leaves 43 for the porches. A backporch of 33 leaves 10 for the front. Is the frontporch the one at the top or bottom of the screen?