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 Nichibutsu, Released in 1989
ROM Version: Scandal Mahjong [BET] (Japan 890217)
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Dip Switch:DSWA
12345678FunctionOption
OnOnOn     Game Out55% (Hard)
OffOnOn     60%
OnOffOn     65%
OffOffOn     70%
OnOnOff     75%
OffOnOff     80%
OnOffOff     85%
OffOffOff     90% (Easy)*
   Off    Last ChanceOff
   On    On*
    Off   UnknownOff*
    On   On
     Off  W.BetOff
     On  On*
      Off Character Display TestOff*
      On On
       OffFlip ScreenOff*
       OnOn
Dip Switch:DSWB
12345678FunctionOption
Off       Coinage1 Coin/1 Credit*
On       1 Coin/2 Credits
 OffOff     Bet Min1*
 OnOff     2
 OffOn     3
 OnOn     5
   OnOff   Bet Max10
   OffOn   12
   OnOn   20*
   OffOff   8
     Off  Bet1 OnlyOff*
     On  On
      Off Score PoolOff
      On On*
       OffUnknownOff*
       OnOn
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