That automatic switchbox on the 4 ports were way ahead of their time back in the day. The 4 port had that while all the other systems had MANUAL rf boxes....what a pain. Your 2 port with the 4 port bios is sweet, guess you can play every 5200 release and use the trackball on a 2 port. I have 2 systems as well. An original unmodded late release 4 port with an asterisk in the serial number so its compatible with everything, I never use it I'm just happy to own it. My second one is an s video modded 4 port which puts out a beautiful picture, that's my daily driver lol. And you're right about the 5200 being a Rodney, it doesn't get the same respect. To me it's still one of my favorites.