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Do I need an I-Pac2 or I-Pac4?
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javeryh:
These are all great responses.  I love this board.  I am also wondering if it is possible to wire 2 trackballs to the same inputs.  They will never be used at the same time - one is for vertical games, the other for horizontal ones.  Thanks everyone!
cholin:
Of course you can.  The only problems you may have would be that one trackball might be less sensitive than the other, current and voltage should be fine, right?  If not, and the trackballs are acting up, you can add a switch or a small circuit to switch between them.

EDIT: I stand corrected.
Lilwolf:
I'm not sure if you can add two trackballs to the same encoder.  Never heard of anyone doing that...

but if you think your doing this, I would really consider going with two hacked mice from Oscar.  at 11 bucks each its not worth the chance of blowing stuff up.  And then you will be able to seperate them if needed (you might want to set it up for dual marble madness with analog+mame)

AndyWarne:
No you can't wire up two trackballs to the same inputs. Just won't work at all. the dual ouse hack would be fine.
You could wire via a switch. You would need to switch all the X and Y lines though, so a 4-way switch. Not very practical.
Andy
javeryh:
OK, so if I want a trackball on the 1P CP and the P3/P4 CP I'm going to need either 2 optipacs or 2 hacked mice from Oscar?  I'm trying to get something similar to the Whammocade... and I think he only used one optipac for the 2 trackballs on his cab...  http://web.tampabay.rr.com/whammoed/whammocade/parts.htm
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