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Trackball wiring question
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patrickmaher:
I would suggest not wiring those buttons to both the I-PAC and the trackball unless you have a specific reason to do so.

You can just wire the player 2 buttons to your I-PAC and eliminate the trackball mouse button wiring. Then setup MAME to use the player 2 1-3 buttons for trackball games. MAME wont care that they are not actual mouse inputs. As long as you set the buttons you want MAME to use for your trackball games it will follow what you set.

Look back at the post by u_rebelscum for info on mapping the buttons.
u_rebelscum:
I partially agree with patrickmaher: don't wire to both the Ipac & TB at the same time. 

If you want mouse buttons in windows or other apps (non-remappable), then I'd put a switch to flip the buttons between the mouse and the Ipac.

If you're just using mame, though, I'd do as patrickmaher said, but you can do the switch as above, too.

The reason you don't want the buttons wired to both the ipac and TB at the same time is just as you've seen; conflicting inputs.  For another example: FE that can take a letter input to zoom to the next game starting with that letter, and a mouse click means start game.  If you press a button that is wired to both the letter 'A' and the mouse click, the FE might jump to the first game starting with 'A' and start that game, or start the game you want and then jump, depending which action the FE sees first.
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