If you're making a portable you probably need something to watch it on. (Unless you want to guess what's happening in the game, but I wouldn't advise that) Anyway, this forum is your "Hacking a pocket TV/screen" one-stop solution. Share your experiences and knowledge here.
I can't understand why it's not possible since they are two seperate circuits. I'm not connecting them anyway except for the 5V power source and ground points.