Vs. Top Gun dip switch settings:
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Dip bank #1:

COINAGE: (dips 1-3)
 - 5 Coins/1 Credit        ON ON  OFF
 - 4 Coins/1 Credit        ON  OFF ON
 - 3 Coins/1 Credit        ON  OFF  OFF
 - 2 Coins/1 Credit         OFF ON ON
 - 1 Coin/1 Credit*         OFF  OFF  OFF
 - 1 Coin/2 Credits         OFF  OFF ON
 - 1 Coin/3 Credits         OFF ON  OFF
 - Free Play               ON ON ON
LIVES PER COIN: (dip 4)
 - 3 - 12 Max*                          OFF
 - 2 - 9 Max                           ON
BONUS: (dips 5-6)
 - 30k and Every 50k*                       OFF  OFF
 - 50k and Every 100k                       OFF ON
 - 100k and Every 150k                     ON  OFF
 - 200k and Every 200k                     ON ON
DIFFICULTY: (dip 7)
 - Normal*                                          OFF
 - Hard                                            ON
DEMO SOUNDS: (dip 8)
 - Off                                                  OFF
 - On*                                                 ON

* - default setting