After the disappearance of Advanced Gravis Computer Technology, Ltd. as a company (thanks to Kensington Computer Products Group >_<) these gamepads don't have any support, and because this particular model uses "Digital" Gameport, it is now impossible to find a gameport-USB adapter that works with it.
After years of searching online, I found you and your chips :)
As I am not stupid, before to buy anything I want to know if any of their models is most appropriate to make an adapter for it.
Below I provide the main data of the Gamepad (here you can find more information concerning the Gamepad: http://www.tweak3d.net/reviews/gravis/xterm/):

- 11 Buttons (7 at left, 2 in front, and 2 in bottom at the ring fingers height)
- An 8-way POV
- An analog stick (X1-X2/Y1-Y2 axis)
- An digital pad (U1-U2/V1-V2 axis)
- 2 analog Flippers (Z1-Z2 axis)
- An Throttle Switch (R1-R2 axis)
As you can see is a huge number of functions. Besides to be digital, also makes hundreds of "veteran hardcore gamers" that become crazy to find a way to connect it.
Do you think this chip would be ideal for this gamepad? Other from your catalog perhaps?
I really hope you can help me, and excuse me if this thread is too off-topic.
A greeting and thank you very much in advance ^_^