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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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Mario Bros.
Manufactured by Nintendo of America, Released in 1983
ROM Version: Mario Bros. (US, Revision E)
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Dip Switch:SW1
12345678FunctionOption
OffOff      Lives3*
OnOff      4
OffOn      5
OnOn      6
  OffOff    Coinage1 Coin/1 Credit*
  OffOn    1 Coin/2 Credits
  OnOn    1 Coin/3 Credits
  OnOff    2 Coins/1 Credit
    OffOff  Bonus Life20k only*
    OnOff  30k only
    OffOn  40k only
    OnOn  None
      OffOffDifficultyEasy*
      OnOffHard
      OnOnHardest
      OffOnMedium
ROM Version: Mario Bros. (US, Revision F)
Print
Dip Switch:SW1
12345678FunctionOption
OffOff      Lives3*
OnOff      4
OffOn      5
OnOn      6
  OffOff    Coinage1 Coin/1 Credit*
  OffOn    1 Coin/2 Credits
  OnOn    1 Coin/3 Credits
  OnOff    2 Coins/1 Credit
    OffOff  Bonus Life20k 40k 20k+*
    OnOff  30k 50k 20k+
    OffOn  40k 60k 20k+
    OnOn  None
      OffOffDifficultyEasy*
      OnOffHard
      OnOnHardest
      OffOnMedium
ROM Version: Mario Bros. (US, Unknown Rev)
Print
Dip Switch:SW1
12345678FunctionOption
OffOff      Lives3*
OnOff      4
OffOn      5
OnOn      6
  OffOff    Coinage1 Coin/1 Credit*
  OffOn    1 Coin/2 Credits
  OnOn    1 Coin/3 Credits
  OnOff    2 Coins/1 Credit
    OffOff  Bonus Life20k only*
    OnOff  30k only
    OffOn  40k only
    OnOn  None
      OffOffDifficultyEasy*
      OnOffHard
      OnOnHardest
      OffOnMedium
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