I am using a 2 1/4" Trackball that connects to my computer through the PS/2 connection.
I'd like to configure the trackball/mouse as the primary control for Centipede, and when I went into the ctrlr.ini file for MAME, the trackball was defined as the primary control. However, when I accessed the Input menu through the [Tab] command within the game, the control was only recognized as the joystick with no clear way to change it.
I know it's possible, but how do you do it?