Here is another picture DJ uploaded awhile back.
1992 --> 2004
Here are some Misc. specs that I can think of just from memory. It runs off 2 seat motors, one for each side. What you are looking at is only 1/2 of the robot. There was a detachable part used for collection of the tennis balls.
See this picture. The robot (part seen) is pretty much all steel and aluminum and the wheels where actually machined from one aluminum plate; giving each wheel a little different pattern. The "ball collector base" actually had an air powered canon that shot a free projectile towards a high point ball which sat on the PVC pipes
as seen here.
