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 Nintendo, Released in 1985
ROM Version: Arm Wrestling
Print
Dip Switch:R18
12345678FunctionOption
 Off      Coin Slots1
 On      2*
Dip Switch:R19
12345678FunctionOption
On       CopyrightNintendo*
Off       Nintendo of America Inc.
Dip Switch:SW1
12345678FunctionOption
OffOffOffOff    Coinage 10000*
OnOffOffOff    0001
OffOnOffOff    0010
OnOnOffOff    0011
OffOffOnOff    0100
OnOffOnOff    0101
OffOnOnOff    0110
OnOnOnOff    0111
OffOffOffOn    1000
OnOffOffOn    1001
OffOnOffOn    1010
OnOnOffOn    1011
OffOffOnOn    1100
OnOffOnOn    1101
OffOnOnOn    1110
OnOnOnOn    1111
Dip Switch:SW2
12345678FunctionOption
OffOff      DifficultyEasy*
OffOn      Hard
OnOn      Hardest
OnOff      Medium
  OnOff    TimeLong
  OffOff    Longest*
  OffOn    Short
  OnOn    Shortest
    Off   Demo SoundsOff
    On   On*
     Off  Rematch At A DiscountOff*
     On  On
  OffOffOffOff  Coinage 20000*
  OnOffOffOff  0001
  OffOnOffOff  0010
  OnOnOffOff  0011
  OffOffOnOff  0100
  OnOffOnOff  0101
  OffOnOnOff  0110
  OnOnOnOff  0111
  OffOffOffOn  1000
  OnOffOffOn  1001
  OffOnOffOn  1010
  OnOnOffOn  1011
  OffOffOnOn  1100
  OnOffOnOn  1101
  OffOnOnOn  1110
  OnOnOnOn  1111
      On Rematches3
      Off 7*
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