The following are the Dip Switch settings based off of MAME 0.180 source code.
 
Use this information at your own risk!  The information was parsed from the MAME source code and could contain errors as to the state, order or descriptions of what the switches do.  If you find an error, please let me know on the Contact Us form and I will work on correcting the issue. 
 
 
 
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Manufactured by Midway Games, Released in 1998
ROM Version: NBA Showtime: NBA on NBC (ver 2.0)
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Dip Switch:DIPS
12345678FunctionOption
        Graphics Mode0
        Number of Players2
        Graphics Mode3
        Number of Players4*
        Graphics Speed45 MHz
        47 MHz
        49 MHz
        Joysticks49-Way
        Graphics Speed51 MHz*
        Graphics Mode512x256 @ 15KHz
        512x385 @ 25KHz*
        Joysticks8-Way*
        Power On Self TestNo*
        Unknown2000Off*
        Unknown8000Off*
        Test SwitchOff*
        Unknown0400Off*
        Unknown0800Off*
        Unknown0200Off*
        Unknown4000Off*
        Unknown1000Off*
        Unknown0100Off*
        Unknown4000On
        Test SwitchOn
        Unknown0800On
        Unknown0100On
        Unknown0400On
        Unknown0200On
        Unknown2000On
        Unknown8000On
        Unknown1000On
        Power On Self TestYes
On       Coinage SourceCMOS*
Off       Dipswitch
 Off      Unknown0002Off*
 On      On
  Off     Unknown0004Off*
  On     On
   Off    Unknown0008Off*
   On    On
 OnOnOn    CoinageFree Play
 OffOffOff    Mode 1*
 OnOnOff    Mode 2
 OnOnOff    Mode 3
 OffOnOn    Mode 4
 OnOffOff    Mode ECA
 OnOffOn    Not Used 1
 OnOnOff    Not Used 2
    Off   Unknown0010Off*
    On   On
     Off  Unknown0020Off*
     On  On
    OnOn  Curency TypeFree Play
    OnOff  French
    OffOn  German
    OnOn  Not Used
    OffOff  USA*
      Off Unknown0
      On 1*
      Off Unknown0040Off*
      On On
       OnGameBlitz 99
       OffNBA Showtime*
       OffUnknown0080Off*
       OnOn
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