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 Alba, Released in 1986
ROM Version: Real Mahjong Haihai Jinji Idou Hen (Japan)
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Dip Switch:DSW1
12345678FunctionOption
Off       Free PlayOff*
On       On
  OffOff    Coinage1 Coin/1 Credit*
  OffOn    A 1/2 B 2/1
  OnOff    A 1/3 B 3/1
  OnOn    A 2/1 B 1/2
    Off   Demo SoundsOff
    On   On*
     Off  Flip ScreenOff*
     On  On
      Off CabinetCocktail
      On Upright*
       OffMedalOff*
       OnOn
Dip Switch:DSW2
12345678FunctionOption
Off       Unknown 2-1Off*
On       On
 OffOffOffOffOffOffOffDifficulty1 (Easy)*
 OffOffOffOffOffOffOn2
 OffOffOffOffOffOnOff3
 OffOffOffOffOnOffOff4
 OffOffOffOnOffOffOff5
 OffOffOnOffOffOffOff6
 OffOnOffOffOffOffOff7
 OnOffOffOffOffOffOff8 (Difficult)
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