I hate to be the bringer of bad news, but there's nothing that can be done about the poor resolution when using the older, non high-def gaming systems.
It may be possible to change the aspect ratio, so at least the view is not being stretched horizontally in excess. Perhaps there is a %26quot;Ratio%26quot; or %26quot;Aspect Ratio%26quot; button on your TV's remote or in it's settings. That's the best you can hope for.How can I get a good picture with a composite cable on a high def monitor?
those old game systems weren't made for high definition. the only way you can make it look %26quot;sort of okay%26quot; (aka progressive scan, not interlaced) is to buy component cables for your Gamecube, and the VGA box for the dreamcast. the playstation is pretty much as good as it gets. you could try getting S-Video for it.