You're right, the correct name for those film slots were "Diamond Cinema"! Oh, wow, the Regis Philbin one was called "Cash Club", I played that silly machine for hours!
It had that ladder on top for the bonus round and when you first put in money, the Regis video would pop up on the screen and he would talk to you "Are you ready to play?"
and I would say "Yes!" LOL! They were those small reels - five of them that would spin.