Oh yeah, she's Duo compatible.
She's compatible with every console system except the Turbografx. I really wish that I could figure out what is wrong with her.
Anyway, here's what they look like: (note: not a picture of my controller. I can post a picture of mine if you want. I would right now, but I'm at work.^^)
Anyway, because it is broken beyond what I am capable of fixing I'd prefer someone take it who can get some use out of it. Plus if you can fix it you'll have a 6 button controller for Street Fighter II.
5 bucks and it's yours, or I'll take a trade of equal value if that works better for you. I'm easy.