[joezydeco]

Discs of TRON was originally intended to be a fifth mode in the original Bally/Midway TRON, but was left out because of a couple of reasons. Some say there wasn't time to finish the mode, some thought the mode was fun enough to break out into it's own title.

And it does not deserve to be forgotten. Playing Discs of TRON in the "environmental" cabinet with stereo sound is a nice experience.

Anyway, here's some fun background on the TRON game, including some original design documents:

http://arcarc.xmission.com/Pictures/Tron%20Lost%20Documents/...

[goatforce5]

An arcade nearish to me had the environmental cabinet, complete with it's customer controller hardware.

This particular machine would give you small electric shocks from the controller which I thought was part of the game, but I now realize that was probably an electrical fault with that particular machine.