I have a 1-player bartop Mame cabinet with a USB port on the front for an optional 2nd player joypad. The 1st player's controls are fine. The 2nd player's controls keep partially resetting after I unplug the controller. I'm losing the joystick mappings (u,d,l,r). The buttons (a,b,c,d) are fine and stay mapped. How come I'm losing the 2nd player's joystick mappings? Can I specifiy them in an .ini file somewhere, and if so, how?