I'm looking to compare notes with anyone who is successfully running dual trackballs in Marble Madness.
I'm running DOS 6.2, Advance MAME 61.3 and an OptiPAC controller. I'm seeing some problems, but only when in two-player mode. With default analog settings, I'm getting some hesitation and backspin. Andy hasn't seen these problems before, so I'm suspicious that I've got something messed up here.
I'd love to hear any troubleshooting ideas, success stories or similar problems you may have encountered.