If you’re going with a scaler, it’s definitely worth it to invest in better cables (even though the n64 uses the same connector as snes, it does not support rgb without mods)

insurrectionindustries.com/…/nintendo-s-video/

insurrectionindustries.com/…/sony-playstation-rgb…

insurrectionindustries.com/…/super-nintendo-enter…

www.amazon.com/…/B07TL6L7MY

Some helpful videos: youtu.be/VYkWtkvhS9c youtu.be/fi7csYj00BU

Also if you’re not too attached to using original hardware, you might want to take a look at getting a mister to play ps1 and before systems (the new super station is a good choice retroremake.co/pages/superstationᵒⁿᵉ )