I have found an old thread back in 2005 that addressed this, though did not answer all my questions. This is where I am at, I have swapped out the drive, the chips, and put in the new graphics board, game fires up, but have a joystick problem. Picked up a i-40 board, and a wire harness from an old blitz 2k, but this is only for the CP (which does have a connection to the i-40 board), I need to know how to connect the controls to the jamma harness, and either to find a Aux adaptor board or how to make one. Any help would be greatly appreciated..