The game will flash all six tomb stones yellow when power is first applied because there is no communication between the computer and the I/O boards. When the pc initializes it will start a service that connects two I/O boards to the PC. Once communication has been established with the I/O boards, the tomb stones will stop flashing. The auto filler bucket motor is turned on and the system will raise the bucket. When the bucket is off of the home switch the game will begin flashing all six tombstones. When the bucket has reached the top of the assembly the game will engage the relay causing the sweeper motor to spin the arms to clear any pucks on the bucket. The sweeper motor will turn briefly one direction and then the other direction after which the game will then return the bucket to the bottom of the assembly engaging the home switch. All during this process the six tomb stones will continue to flash yellow and not accept credits. After the auto filler finishes cycling the bucket and the input for the bucket home switch is made the tomb stones will stop flashing yellow and all stations will begin to accept credits to play.