danjovicFirst captured waveforms showed good results. It seems that everything is OK with the code.
The vertical retrace interval seems to be OK, with the Horizontal Equalization lines as well as the vertical serration.
The video content contains alongside with the grayscale a series of (black and white) line pairs with progressive spacing so it is possible to estimate the vertical resolution of the monitor. The thinnest pair of lines is only one clock cycle apart which means an equivalent resolution of about 800 pixels.
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