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Old 18 June 2018, 15:51   #22
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Join Date: May 2011
Location: Taradale / Australia
Posts: 61
Many years ago I made a TV test pattern generator from an A1200 motherboard. I needed to get extreme overscan to get an accurate representation of a PM5544 pattern, in excess of overscan normally attainable in a standard PAL screenmode.

I achieved this by using moned to modify a Euro 36 monitor to provide a PAL super hires screenmode with extreme overscan, 1472x594. In 'ordinary' hi res, this equates to 736x594. It is possible to go even higher, by extending active pixels further into the blanking periods.
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