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 Technos Japan, Released in 1990
ROM Version: Double Dragon 3 - The Rosetta Stone (Japan)
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Dip Switch:SW1
12345678FunctionOption
OffOff      Coinage1 Coin/1 Credit*
OnOff      1 Coin/2 Credits
OffOn      2 Coins/1 Credit
OnOn      3 Coins/1 Credit
    Off   Continue DiscountOff*
    On   On
     On  Demo SoundsOff
     Off  On*
      Off Flip ScreenOff*
      On On
Dip Switch:SW2
12345678FunctionOption
        Players2*
        Starting Energy200
        230*
        Players3
        Stage Clear Energy50*
        DifficultyEasy
        Hard
        Hardest
        Normal*
        Player Vs. Player DamageOff*
        Stage Clear EnergyOff
        Player Vs. Player DamageOn
ROM Version: Double Dragon 3 - The Rosetta Stone (prototype)
Print
Dip Switch:SW1
12345678FunctionOption
OffOff      Coinage1 Coin/1 Credit*
OnOff      1 Coin/2 Credits
OffOn      2 Coins/1 Credit
OnOn      3 Coins/1 Credit
    Off   Continue DiscountOff*
    On   On
     On  Demo SoundsOff
     Off  On*
      Off Flip ScreenOff*
      On On
Dip Switch:SW2
12345678FunctionOption
        Players2*
        Starting Energy200
        230*
        Players3
        Stage Clear Energy50*
        DifficultyEasy
        Hard
        Hardest
        Normal*
        Stage Clear EnergyOff
        Player Vs. Player DamageOff*
        On
ROM Version: Double Dragon 3 - The Rosetta Stone (US)
Print
Dip Switch:SW1
12345678FunctionOption
OffOff      Coinage1 Coin/1 Credit*
OnOff      1 Coin/2 Credits
OffOn      2 Coins/1 Credit
OnOn      3 Coins/1 Credit
    Off   Continue DiscountOff*
    On   On
     On  Demo SoundsOff
     Off  On*
      Off Flip ScreenOff*
      On On
Dip Switch:SW2
12345678FunctionOption
        Players2*
        Starting Energy200
        230*
        Players3
        Stage Clear Energy50*
        DifficultyEasy
        Hard
        Hardest
        Normal*
        Stage Clear EnergyOff
        Player Vs. Player DamageOff*
        On
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