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Some more mostly-irrelevant ramblings about the PAL Amiga pixel aspect ratio...
The length of the active part of each scanline isn't specified exactly but with some tolerance it seems. Some sources say the active line is 51.95μsec (vs 52μsec above).
For PAL system I, there were (according to some web pages) originally 582 active lines. And if you google pal 582 lines some results suggest CCTV cameras output video with 582 active lines.
PAL Amiga hardware might actually be capable of outputting at least 580 lines, even if the Amiga can only show the background colour there. I wonder if someone could test that? Connect Amiga to a 1081/1084 monitor, reduce picture height so entire image is visible and count scanlines.
Here are calculated Amiga aspect ratios supposing:
576 lines of 51.95μsec: (768/51.95)/14.18758 = 768000000/737044781 = 1.041999 approx (so almost exactly 1.042)
582 lines of 52μsec: (776/52)/14.18758 = 9700000/9221927 = 1.051841 approx.
582 lines of 51.95μsec: (776/51.95)/14.18758 = 776000000/737044781 = 1.052853 approx.
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