Hacking a mouse for encoders

This site might have some interesting information relating to the
mouse thread.

http://www.boondog.com/

Click on Tutorials in the left side menu and go down 2/3 of a page to
the title 'Hacking a mouse for encoders', or for direct access go to

http://www.boondog.com/tutorials/mouse/mouseHack.htm

Regards
Tom csibor