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 System Ten, Released in 1989
ROM Version: Pairs (System Ten) (Japan 890826)
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Dip Switch:DSWA
12345678FunctionOption
OffOff      DifficultyEasy*
OffOn      Hard
OnOn      Hardest
OnOff      Medium
  Off     Coinage1 Coin/1 Credit*
  On     1 Coin/2 Credits
   Off    Demo MusicOff
   On    On*
    Off   Game MusicOff
    On   On*
     Off  Flip ScreenOff*
     On  On
      Off UnusedOff*
      On On
       OffCharacter Display TestOff*
       OnOn
Dip Switch:DSWB
12345678FunctionOption
Off       UnusedOff*
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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