I just bought a Turbografx 16 and I have a few questions.

[Urzu402]

What would I need to play the Street Fighter 2 port on the system I just bought, and what would I need to use a 6 button controller?
As I understand these are Japanese only things and the system I bought is a North American one. I don't know much about this system.

[todesengel]

You can get a region switch mod done to the system that will let you play imports. As for the controller, there might be some kinda adapter floating around.

[Gameguy]

You could get a converter type card to play Japanese PC Engine games on it, you won't need to get it modded(the converters are hard to find though). There are 6 button controllers available for the Japanese systems, I think there are converter cables so you can use them on US systems but I also think you could just swap the cord with a normal US controller as they just plug into the board. I haven't done this myself but I'm pretty sure it can be done.

[Urzu402]

Is there any way to play it without a system mod? and one more question, Does it output composite? if so where can I get composite cables for the system? all I'm finding on ebay are RF switches.

[todesengel]

For composite video you need to buy the Turbo Booster accessory, composite wasn't stock on the system. Sadly for imports though it's either hunting for a convertor card or doing a switch mod.

[Duke.Togo]

For a cheap composite workaround, you can wire it up yourself from the port on the back. You can google the port pinout pretty easily and here is an example of what someone did: