I just got a 3dfx hammerhead FX force Feedback Analog Game pad, and need and usb adapter that can support force feedback are there any 15 pin game pad to usb adapters that support force feedback?
Sorry I cannot answer about the connector but I used to love that gamepad it was the best for its time.
I really doubt that a usb adapter would reliably support the power draw for the force feedback motor(s). You could always get a gameport card to install in your computer though. Nothing past XP will even be supported as far as force feedback goes. Here are the newest drivers you can get: http://www.falconfly.de/hammerhead.htm