aspectyl wrote:
https://atariage.com/forums/topic/189995-confusion-with-aspect-ratios/#entry2403136
Atari 800 also uses 7.16 MHz / 6:7 ratio NTSC.
Just advertising since it's not in dot clock wiki.
Thanks for the citation. If you find more, feel free to
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lidnariq wrote:
I was under the impression that the VGA 640x480 and 320x240 modes were "exactly" square, not "sorta" square...? Although it's not like VGA ever was used to directly emit to a TV anyway without using some other kind of reclocking.
In theory, VGA's 480-line modes (mode 12h and mode X) hsync at ~31.5 kHz and vsync at ~60 Hz, the right frequency for 480p EDTV. But the page lists a lot of arcade systems and home computers whose monitors may be configured for an active picture width shorter than the standard 704/13.5 = 52.148 microseconds. Apple IIGS AppleColor RGB monitors, for instance, come set about 11% wide, which accounts for the difference between the 5:6 or 5:12 PAR specified by Apple for super hires modes and the 3:4 or 3:8 PAR seen through the IIGS's composite output. VGA monitors are about 5% wide for the same reason.