Originally Posted by Jope
Only the flickering Amiga modes are in interlace, everything else is displayed in a progressive mode (288p for PAL machines). So to me this sounds like you're forcibly deinterlacing a progressive screen. Each field is unique.
Well not the interlacing, but if you have something that runs 50FPS (such as a scrolling playfield), you will get jerky motion.
It seems you are correct, I found some bug in the Verilog code that will make even progressive output display as interlaced
Thank for your input, I will see what I can do. I think I will release another video where I demonstrate horizontal movement as well as vertical.