>>105980612
>but due to the nature of how it works
Since you never replied and I really wanted to talk about it, here's how it actually works:

You need to know that a CRT is always scanning the beam vertically at a constant speed, scanlines actually droop to the right.
To progressive scan a CRT, you just generate the vertical sync pulse in sync with the horizontal scanline.
But to interlace, you start the vertical sync pulse in middle of a horizontal scan line. The CRT will just obey and immediately start moving the beam back to the top, but ends up half a scanline off vertically from where it began the previous frame, because you sent the sync pulse half a scanline off the previous frame!
Interlace is literally just a timing hack that takes advantage of how absolutely crude and primitive CRT drive and sync electronics are. Thus any and all CRTs can do both interlace and progressive, ignoring those few weird digital TVs.