Well, I've had enough.
Berzerk and Qix, as well as several others, are great 5200 games, but those stupid $@&*#%*&$ controllers!
So- my next project is to rewire one 5200 controller into another, a "regular" controller, to make a standard one for the 5200.
I've taken apart 5200 controllers before. Although I have to use a multi-tester yet, I've noticed what appear to be two potentiometers in it; it's like using a pair of paddle controllers to move something about. Therefore, I have to find out what the Ohms are for the directions, and "neutral,' once done, it will be a tricky but not impossible task to get the proper resistances installed- parallel connections for resistors, for example.
It'll make Berzerk and Ms. Pac-Man playable!