I think the issues with some games not working in B2 that worked fine in B1, might have something to do with joystick port 2.
I have noticed that some two player games that we played fine with beta 1 are now unplayable.
These are Nitro
(works great if you play alone, but with two players the cars go just completely crazy when game starts),
Super Cars 2
(same as Nitro, in two player mode cars go crazy as soon as the game starts),
Speedball 2
(worked fine with B1, but it actually doesn't go further from intro screen anymore and I guess it's related to the fact that you had to push joystick port 2 in this screen to get the game start)
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