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 Sphinx / AV Japan, Released in 1994
ROM Version: Imekura Mahjong (Japan)
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Dip Switch:DSWA
12345678FunctionOption
OffOffOff     Difficulty1 (Easy)*
OnOffOff     2
OffOnOff     3
OnOnOff     4
OffOffOn     5
OnOffOn     6
OffOnOn     7
OnOnOn     8 (Hard)
   Off    Game SoundsOff
   On    On*
    Off   Demo SoundsOff
    On   On*
     On  Flip ScreenOff*
     Off  On
      OffOffCoinage1 Coin/1 Credit*
      OnOff1 Coin/2 Credits
      OffOn1 Coin/3 Credits
      OnOn2 Coins/1 Credit
Dip Switch:DSWB
12345678FunctionOption
Off       DIPSW 2-1Off*
On       On
 Off      DIPSW 2-2Off*
 On      On
  Off     DIPSW 2-3Off*
  On     On
   Off    DIPSW 2-4Off*
   On    On
    Off   DIPSW 2-5Off*
    On   On
     Off  DIPSW 2-6Off*
     On  On
      Off Character Display TestOff*
      On On
       OffGraphic ROM TestOff*
       OnOn
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