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 Brooks, Released in 1989
ROM Version: Mahjong Nanpa Story (Japan 890712)
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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    Coinage1 Coin/1 Credit*
   On    1 Coin/2 Credits
    Off   Flip ScreenOff*
    On   On
     Off  Demo SoundsOff
     On  On*
      Off Game SoundsOff
      On On*
       OffUnknownOff*
       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 Nanpa Story (Japan 890713)
Print
Dip Switch:DSWA
12345678FunctionOption
OffOffOff     Difficulty1 (Easy)*
OnOffOff     2
OffOnOff     3
OnOnOff     4
OffOffOn     5
OnOffOn     6
OffOnOn     7
OnOnOn     8 (Hard)
   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*
       OffCharacter Display 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 Nanpa Story (Ura) (Japan 890805)
Print
Dip Switch:DSWA
12345678FunctionOption
OffOffOff     Difficulty1 (Easy)*
OnOffOff     2
OffOnOff     3
OnOnOff     4
OffOffOn     5
OnOffOn     6
OffOnOn     7
OnOnOn     8 (Hard)
   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*
       OffCharacter Display 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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