Add a coin or have the game set to to free play and press the start button. The bar will go to the bottom of the playfield, open the gate, and allow the ball to come out.
Remove the ball from the bar and use the joysticks to move the bar all the way to the top and bottom on each side.
You will see the bars on the right hand side of the test app screen. The end stops will cause the bar to stop at the top and bottom of travel.
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