Vs. Tennis dip switch settings:
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Dip bank #1:

DIFFICULTY VS. COMPUTER: (dips 1-2)
 - Easy*                    OFF  OFF
 - Normal                   OFF ON
 - Hard                    ON  OFF
 - Very Hard               ON ON
DIFFICULTY VS. PLAYER: (dips 3-4)
 - Easy*                            OFF  OFF
 - Normal                           OFF ON
 - Hard                            ON  OFF
 - Very Hard                       ON ON
RAQUET SIZE: (dip 5)
 - Large*                                   OFF
 - Small                                   ON
EXTRA SCORE: (dip 6)
 - 1 Set*                                       OFF
 - 1 Game                                      ON
COURT COLOR: (dip 7)
 - Green*                                           OFF
 - Blue                                            ON
COPYRIGHT: (dip 8)
 - Japan*                                               OFF
 - USA                                                 ON


Dip bank #2:

COINAGE: (dips 1-2)
 - 2 Coins/1 Credit        ON  OFF
 - 1 Coin/1 Credit*         OFF  OFF
 - 1 Coin/2 Credits         OFF ON
 - Free Play               ON ON
DOUBLES 4 PLAYER: (dip 3)
 - 2 Credits                        OFF
 - 4 Credits*                      ON
DOUBLES VS CPU: (dip 4)
 - 1 Credit                             OFF
 - 2 Credits*                          ON
RACKETS PER GAME: (dips 5-6)
 - 2                                       ON ON
 - 3*                                       OFF  OFF
 - 4                                        OFF ON
 - 5                                       ON  OFF
DEMO SOUNDS: (dip 7)
 - Off                                              OFF
 - On*                                             ON

* - default setting