it sounds like u would need to use one of the trackball inputs of the optipac for your trackball, and use the other trackball input of the optipac for both of your spinners (ie. one of your spinners would use X1 and X2, and the other spinner would use Y1 and Y2).
then you would need to configure the mame default keys/inputs so that both of the spinners perform correctly, because by default mame would think both of your spinners form one single trackball, er, I think
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Re: Optipac: two spinners and one trackbal....means two mouses?
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