arcade-forge sells all manner of scalers for use with retro consoles on modern displays.
I have a modded N64 that outputs RGB scart. I connected this to a sync trike to convert it to VGA; as my plasma doesnt have the correct vertical sync for the VGA coming off that; I purchased a SLG3000.. It seems to be working fairly well on my plasma; but even better on an LCD so I may concider upgrading to an LED screen next (I do however think in general picture quality is better on a plasma but thats another thing all together)
Anyway What I am getting at is games all work fine BUT and its a biggy! The everdrive menu does not come through when using the scalers. maybe its what the everdrive output refresh rate its menu system's at?
As I know the menu system, I selected a game at random and the game came up; also tried an actual N64 cart in unit too game came up.. but alas no menu through the SLG3000 anyone else had this issue?
I am also thnking of getting a VGA to HDMI scaler to see if that improves my picture. I am glad there is screen positioning of the SLG3000 it should give a descent picture on my plasma then.. and maybe save me getting new TV..? Now if only I can view that everdrive menu!