Today I was investigating jumpy video, I have a megadrive next to the gbsc aio on my desk. I built 2 one with aliexpress special parts and one with the recommended lcsc parts. In fact the one I buillt with aliexpress parts seems a little better in use. When i tap the megadrive the picture jumps this is more or less constant with one gbsc and intermittent with the other. I changed the console to a snes and both gbs work rock solid, the megadrive works correctly no problems with an old crt tv. I just wanted to share as the kind of consoles we want to play are about 30 years old and they can have weird behavour. It may be good advice to try a few consoles to see how they work before deciding the problem is with the gbs.