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How does the monitor avoid confusion between the 350-line VGA mode and a secondary GTF timing?

April 26, 2017avoid confusion gtf mode monitor Secondary timing VGA

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How does the monitor avoid confusion between the 350-line VGA mode and a secondary GTF timing?

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The monitor knows that all timing modes with a horizontal frequency below the “Second GTF start frequency” shall be treated as legacy timings. The Second GTF start frequency shall always be set to a value higher than the horizontal frequency used for any supported legacy timings that have horizontal positive and vertical negative sync polarities.