I have a System 1 Indy Jamma harness. I'm trying to modify it to work with Marble Madness. looks like i just need to connect the trackball to J103 on the main board, pins 6,7,8 and 10. the trackball has +5 and ground connections from the jamma connector. so, i didn't connect pins 1 and 11 on J103. looks like it should work, but can't move the marble. game coins up and starts, but no movement. is there any other connections i need to make for MM? thanks!

