Larry Holloway

I have a Cocktail Arcade from Awesome Arcades. It uses a Pandora DX with Atari's games on it. When I run Tempest, it will use the joystick for movement. I want to use a spinner. In the Atari Centipede, it will use the trackball. If I plug in my spinner, the spinner will work on Centipede (of course, only right and left movement), I assume Tempest is using the controls from the JAMMA board (access the joystick), while Centipede is using the USB port on the Pandora DX for the Trackball. How can I get Tempest to use the USB port, instead of the JAMMA board inputs? Can I go in the ROM and make a modification? I am new to this and think the ROM is in Assembly language. I did have a class in Assembly, a long time ago.