I remember the first one as well. Of course, I was quite young, a toddler, really...
Anyway, I can remember the theater I saw it in... In the lobby they had a half-dozen coin-op Tron video game machines. Anyone remember those ?
They had four games in one all relating to scenes from the movie.
The high scorer's got to play on the "pedestal machine" which had some new-fangled thing called a 'big screen TV' hooked up to the video output and hanging on the wall overhead, so everyone could watch as they played the game...
Ahh, memories...