I am trying to get PiMAME working with a xin-mo USB dual joystick controller. There are 22 buttons available on this controller. These buttons are visible in jstest and advj and I can successfully generate a key press on any of these buttons using either utility. However, I cannot configure button numbers > 9 in advmame.rc.

Example:
input_map[start1] joystick_button[0,9] or keyboard[0,1] -- works
input_map[start2] joystick_button[0,18] or keyboard[0,2] -- does not work

Is there some sort of hard-coded limit as to the number of joystick buttons that advmame recognizes?

Thanks for your help.
-goldino