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 bootleg, Released in 1991
ROM Version: Thunder Dragon (bootleg)
Print
Dip Switch:SW1
12345678FunctionOption
OnOn      Lives1
OnOff      2
OffOff      3*
OffOn      4
  Off     UnusedOff*
  On     On
   Off    Off*
   On    On
    OnOff  DifficultyEasy
    OffOn  Hard
    OnOn  Hardest
    OffOff  Normal*
      Off UnusedOff*
      On On
       OffFlip ScreenOff*
       OnOn
Dip Switch:SW2
12345678FunctionOption
OffOffOff     Coin A1 Coin/1 Credit*
OffOffOn     1 Coin/2 Credits
OnOffOn     1 Coin/3 Credits
OffOnOn     1 Coin/4 Credits
OnOffOff     2 Coins/1 Credit
OffOnOff     3 Coins/1 Credit
OnOnOff     4 Coins/1 Credit
OnOnOn     Free Play
   OffOffOff  Coin B1 Coin/1 Credit*
   OffOffOn  1 Coin/2 Credits
   OnOffOn  1 Coin/3 Credits
   OffOnOn  1 Coin/4 Credits
   OnOffOff  2 Coins/1 Credit
   OffOnOff  3 Coins/1 Credit
   OnOnOff  4 Coins/1 Credit
   OnOnOn  Free Play
      On Demo SoundsOff
      Off On*
       OffUnusedOff*
       OnOn
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