Comment Re:This is not worth mentioning! (Score 1) 154
Wire up a USB connector and write a driver to support it under Mac OSX, Linux and Windows.
While it's not for the Atari tablet (and also not USB), a couple of years ago I made an adapter for my Commodore KoalaPad to connect it to the PC joystick port: http://unixplumber.livejournal.com/14324.html
By the way, I wonder if there's a way to use a joystick as a core pointer in X... I guess it's Google time!