Very Computer

Is it possible to change a strange-looking DEC Mouse into a mouse
working on a plain PC ? The mouse is *very* large (and very inconfortable
for people with normal hands, that's with they gave it to me ;-) ), it is
model number: VSXXX-AA.C03, it's written HAWLEY and Digital on it. It does
not works with a bowl but with two cylinders (bended on the X and on the Y).
The connector is a weird DIN-7 (at least there are 7 male pins), like this:
                            _______
                           /  . .  \
                          ]         [<---small bend on each sides
                         | .  ===  . |
                         |     .     |   (plastic rectangle in the center)
                          \  .   .  /
                           \_______/

I would like to know the signification of each pin (power, ground, etc...) if
anybody has it... Or would anybody know any DEC hardware "hacker" ?
        Alex.