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 have an idea if you are on a very low budget. if your usung a black and white system you could hock it up to one of those like 12 dollar portables tv.