Avalanche, Clowns, and Warlords are more examples of games that used free spinning pots.
OK, I think I've figured out our communication disconnect.
Atari games like Warlords originally used pots with a slip clutch.
- If you turn the pot in one direction, the wiper will stop turning when it reaches the 5v or ground terminal, but the slip clutch will allow the shaft to continue to turn so the pot isn't damaged by over-torquing. You can hear the wiper hit the terminal stop at 1:50 in the video.
- With this setup, the wiper
will not directly jump the gap between the 5v terminal and the ground terminal.
- The terminal stops allow less than 360 degrees of wiper rotation. (not free spinning)
A free spinning pot is like the one in Omega Race.
- If you turn the pot in one direction, the wiper
will not stop turning when it reaches the 5v or ground terminal.
- The gap between the 5v and ground terminals is large enough that the wiper won't short them together.
- With this setup, the wiper
will directly jump the gap between the 5v terminal and the ground terminal.
- Having no terminal stops allows an unlimited amount of wiper rotation. (free spinning)
I'll give Road Blasters another try. It seemed to play fine with my analog joysticks last I checked. *Edit* It was fixed in MAME: "0.222: Fixed Road Blasters steering wheel does not auto center. The RoadBlasters steering wheel is very much like the Star Wars yoke, without the vertical (Y) axis [Curseur, Tafoid]. Replaced Dial controller with Stick."
Thanks for the info. Sounds like that update should make it work much better with potentiometer controllers.
Scott