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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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Bonanza Bros
Manufactured by Sega, Released in 1990
ROM Version: Bonanza Bros (Japan, Floppy DS3-5000-07b Based)
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Dip Switch:SW2
12345678FunctionOption
Off       Demo SoundsOff
On       On*
 Off      Start Credit1*
 On      2
  Off     Coin ChuteCommon*
  On     Individual
   Off    Flip ScreenOff*
   On    On
    OnOff  DifficultyEasy
    OffOn  Hard
    OnOn  Hardest
    OffOff  Normal*
      OnOnLives1
      OffOn2
      OffOff3*
      OnOff4
ROM Version: Bonanza Bros (US, Floppy DS3-5000-07d? Based)
Print
Dip Switch:SW2
12345678FunctionOption
Off       Demo SoundsOff
On       On*
 Off      Start Credit1*
 On      2
  Off     Coin ChuteCommon*
  On     Individual
   Off    Flip ScreenOff*
   On    On
    OnOff  DifficultyEasy
    OffOn  Hard
    OnOn  Hardest
    OffOff  Normal*
      OnOnLives1
      OffOn2
      OffOff3*
      OnOff4
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