Updated: 2008-05-29
Gameware seems to be Game's own-brand. There were no system requirements listed on the box, so I decided I could claim innocence if the product didn't work.
The device holds a single port for a single PS2 controller.
The adaptor seems to follow the USB HID inteface, so I just plugged it in (under Ubuntu 7.04), and changed the device configuration in ZSNES, and it just worked.
The analogue sticks also work fine.