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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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Mahjong CLUB 90's
Manufactured by Nichibutsu, Released in 1990
ROM Version: Mahjong CLUB 90's (set 1) (Japan 900919)
Print
Dip Switch:DSWA
12345678FunctionOption
OffOff      Difficulty1*
OnOff      2
OffOn      3
OnOn      4
  Off     Coinage1 Coin/1 Credit*
  On     1 Coin/2 Credits
   Off    Flip ScreenOff*
   On    On
    Off   Demo SoundsOff
    On   On*
     Off  Game SoundsOff
     On  On*
      Off Allow ContinueNo
      On Yes*
       OffGraphic ROM TestOff*
       OnOn
Dip Switch:DSWB
12345678FunctionOption
Off       UnknownOff*
On       On
 Off      Off*
 On      On
  Off     Off*
  On     On
   Off    Off*
   On    On
    Off   Off*
    On   On
     Off  Off*
     On  On
      Off Off*
      On On
       OffOff*
       OnOn
ROM Version: Mahjong CLUB 90's (set 2) (Japan 900919)
Print
Dip Switch:DSWA
12345678FunctionOption
OffOff      Difficulty1*
OnOff      2
OffOn      3
OnOn      4
  Off     Coinage1 Coin/1 Credit*
  On     1 Coin/2 Credits
   Off    Flip ScreenOff*
   On    On
    Off   Demo SoundsOff
    On   On*
     Off  Game SoundsOff
     On  On*
      Off Allow ContinueNo
      On Yes*
       OffGraphic ROM TestOff*
       OnOn
Dip Switch:DSWB
12345678FunctionOption
Off       UnknownOff*
On       On
 Off      Off*
 On      On
  Off     Off*
  On     On
   Off    Off*
   On    On
    Off   Off*
    On   On
     Off  Off*
     On  On
      Off Off*
      On On
       OffOff*
       OnOn
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