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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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Big Twin
Manufactured by Playmark, Released in 1995
ROM Version: Big Twin
Print
Dip Switch:SW1
12345678FunctionOption
Off       Coin ModeMode 1*
On       Mode 2
 OffOff     Coin A Mode 21 Coin/1 Credit*
 OnOff     2 Coins/1 Credit
 OffOn     3 Coins/1 Credit
 OnOn     5 Coins/1 Credit
   OffOff   Coin B Mode 21 Coin/2 Credits*
   OnOff   1 Coin/3 Credits
   OffOn   1 Coin/5 Credits
   OnOn   1 Coin/6 Credits
 OffOffOffOff   Coinage Mode 11 Coin/1 Credit*
 OffOnOnOff   1 Coin/2 Credits
 OnOnOnOff   1 Coin/3 Credits
 OffOffOffOn   1 Coin/4 Credits
 OnOffOffOn   1 Coin/5 Credits
 OffOnOffOn   1 Coin/6 Credits
 OnOffOffOff   2 Coins/1 Credit
 OnOnOffOn   2 Coins/3 Credits
 OffOnOffOff   3 Coins/1 Credit
 OffOffOnOn   3 Coins/2 Credits
 OnOnOffOff   4 Coins/1 Credit
 OffOffOnOff   5 Coins/1 Credit
 OnOffOnOn   5 Coins/3 Credits
 OnOffOnOff   6 Coins/1 Credit
 OffOnOnOn   8 Coins/3 Credits
 OnOnOnOn   Free Play
     Off  Minimum Credits to Start1*
     On  2
      Off UnknownOff*
      On On
       OffOff*
       OnOn
Dip Switch:SW2
12345678FunctionOption
On       LanguageEnglish*
Off       Italian
 Off      UnknownOff*
 On      On
  On     Censor PicturesNo*
  Off     Yes
   Off    Rising Ground LevelOff*
   On    On
    OnOff  DifficultyEasy
    OffOn  Hard
    OnOn  Hardest
    OffOff  Medium*
      On Allow ContinueNo
      Off Yes*
       OffDemo SoundsOff
       OnOn*
ROM Version: Big Twin (No Girls Conversion)
Print
Dip Switch:SW1
12345678FunctionOption
Off       Coin ModeMode 1*
On       Mode 2
 OffOff     Coin A Mode 21 Coin/1 Credit*
 OnOff     2 Coins/1 Credit
 OffOn     3 Coins/1 Credit
 OnOn     5 Coins/1 Credit
   OffOff   Coin B Mode 21 Coin/2 Credits*
   OnOff   1 Coin/3 Credits
   OffOn   1 Coin/5 Credits
   OnOn   1 Coin/6 Credits
 OffOffOffOff   Coinage Mode 11 Coin/1 Credit*
 OffOnOnOff   1 Coin/2 Credits
 OnOnOnOff   1 Coin/3 Credits
 OffOffOffOn   1 Coin/4 Credits
 OnOffOffOn   1 Coin/5 Credits
 OffOnOffOn   1 Coin/6 Credits
 OnOffOffOff   2 Coins/1 Credit
 OnOnOffOn   2 Coins/3 Credits
 OffOnOffOff   3 Coins/1 Credit
 OffOffOnOn   3 Coins/2 Credits
 OnOnOffOff   4 Coins/1 Credit
 OffOffOnOff   5 Coins/1 Credit
 OnOffOnOn   5 Coins/3 Credits
 OnOffOnOff   6 Coins/1 Credit
 OffOnOnOn   8 Coins/3 Credits
 OnOnOnOn   Free Play
     Off  Minimum Credits to Start1*
     On  2
      Off UnknownOff*
      On On
       OffOff*
       OnOn
Dip Switch:SW2
12345678FunctionOption
On       LanguageEnglish*
Off       Italian
 Off      UnknownOff*
 On      On
  Off     Off*
  On     On
   Off    Rising Ground LevelOff*
   On    On
    OnOff  DifficultyEasy
    OffOn  Hard
    OnOn  Hardest
    OffOff  Medium*
      On Allow ContinueNo
      Off Yes*
       OffDemo SoundsOff
       OnOn*
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