We had a rather lengthy discussion in discord about the bizarre behavior of the vertical scaling algorithm in the Super Nt, in addition to the visible window being tied to the algorithm, causing faulty math and output conditions.
For example:
If you max the vertical out to 5x (1200), the visible window only shows 1175 vertical res, resulting in a total clip of 9 pixels instead of just 8. I cross-referenced this on two different displays as well as my E1S capture card, and the result was exactly the same. Here's the lossless capture showing the net loss of an extra pixel row:
Note how also in that image the vertical position had to be lowered to 40 in order to center in on the active 1175 lines.
It gets even worse for non-integer scaling. If you enable HV interpolation and attempt to scale to fit the screen vertically, the math dictates you should be able to set the res at 1410x1157. However, due to the faulty scaling algorithm, this ends up clipping a couple rows of pixels. The closest you can get is 1406x1153, and you have to set the vertical position to 44. Below is the lossless capture for proof of that as well:
So there are some rather strange bugs with the scaling function in the Super Nt. Nothing deal-breaking, but it is something that shouldn't be happening. For those that like fullscreen or clipped overscan 5x, you're not able to get the best experience in those modes.