Impossible Mission on the C-64 is one of my all-time favorites. I've tried it with several different emulators and a couple different game images and I keep running into one problem: in some of the rooms, one of the robot's energy blasts will be invisible. You can hear the zap sound, so you know they're blasting, but you can't see it until it hits you. Anyone found a way around this?
Oh, tried a couple different systems / monitors as well.