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CSYNC is "composite sync" which is the same that CSYNC_B except the latter is buffered.
If CSYNC_B was wrong I imagine the TV wouldn't sync to the composite signal, since it's this "clock" which is used to generate the analog composite signal by the encoder.
What I think is that this error lies in the digital domain. Denise seems to be constructing the picture erroneously. Is it because her inputs are wrong or because she doesn't do her job well, I don't really know.
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