Sync signal polarity
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Forgive the ignorance, but how is the sync polarity specified in the video routines?
What I read says a negative sync is one where the default state of the signal is positive and goes low. Positive sync being ground normally and going high.
What I read says a negative sync is one where the default state of the signal is positive and goes low. Positive sync being ground normally and going high.
Comments
Bit 0 of the video configuration register can be set to 1 for negative hsync or 0 for positive hsync (VGA mode).
Here is a great page that shows many VGA modes with their timings and sync polarities:
http://www.tinyvga.com/vga-timing