My first thought, based on the 8 pin connector, is
that it's for a Sun. I
have a trackball with the same connector, which has a label saying 'Sun'
something-or-other stuck on the microntroller.
-tony
I just got (with a Tadpole Sparcbook) a trackball. It has the same
connector. I would try plugging it into the socket on a Sun keyboard
and see if it works.
Dan