Many thanks for your help joyrider3774. Until next weekend I won’t be able to try it, but if you can post your files, to take a look meanwhile…

Anyway I’m using lr-mame2003, so it also uses retroarch configs and in the tab config I press cancel and start every one with none, but when I press up or so, it puts UP RETROPAD1 UP, so I suppose that anyway, pad’s buttons are assigned to keyboard’s ones and this is what I have to solve.

By the way, do you know how to use the mouse in retroarch? In advmame I’ve assigned its buttons in the tab menu, but not the mouse movements, and in lr-mame2003, not the buttons, nor the movements…