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 noticed that there is a pin on the PSOne pinout that says +5 volts. Is this a place where you can power the screen with 5 volts, or is it a place where you can get five volts to power the videogame motherboard? It would be useful if it either said "5 volts out" or "5 volts in."