Uh, maiof, you said you wanted to use it in your Playstation2, correct?
PS/2 refers not to "Playstation 2" but to a port first used on IBM's "Personal System 2" computers. These plugs are circular mini-DIN connectors similar to S-Video plugs.
The Playstation 2 has two USB ports on the front, in the lower left, underneath the disc tray. So you can use your USB mouse and/or keyboard without any modification at all! As long as the game is programmed to use USB devices, that is.