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I FIGURED IT OUT!!! All the advice given above is right, BUT it has to be done to vector.ini (in the ini folder) NOT mame. ini. In vector.ini, make sure it's "mouse 1" and "multimouse 1" (not 0).

https://hyperarcades.forumotion.com/t637...ame-part-2#4384

Of course I need a vector.ini file with those settings. I cannot understand how I could have missed this.