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320x200 only has the same vertical timing as 720x400 if lines are double-scanned in 320x200 (which they are on VGA cards, but not on earlier cards), or if the 720x400 mode is interlaced (which I'm not aware of on any PC).
– Michael Graf
Commented May 17, 2020 at 12:15
1

That is true, I just referred to the graphics modes that have 320x200 resolution. Of course the VGA monitor does not even support 200-line modes, so it is obvious from the context that this is about VGA so the 320x200 pixel modes are double-pixeled and double-scanned, so the monitor will regard them all as same 640x400 or 720x400 mode as they only differ in their timing by about 4 PPM.
– Justme
Commented May 17, 2020 at 12:34

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