Still looking for any and all advice on this baby - I have received a brand new LETA chip and fitting that has not helped, the marbles still move but only up to a certain speed, which is not fast enough as if it was i could clear a jump!
Basically you can roll the marble as slowly or as fast as you like up to a point at which it wont go any faster, so that to me says that it is registering the trackball movements ok, and the trackballs themselves have been completely serviced although i have not replaced the optic boards themselves, could they be the issue (although as it is the same with both trackballs i cant see all 4 optics going bad, unless they are the wrong ones fitted...
It has got to the point where i now want to sell the cab but am still looking for a way to resolve the problem as i was after one of these for ages and just really want to play the thing!
One last thing, could it be a rom issue at all, any thoughts on that?