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 Taito Corporation Japan, Released in 1988
ROM Version: Operation Thunderbolt (World)
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Dip Switch:DSWA
12345678FunctionOption
 On      Allow ContinueNo
 Off      Yes*
Dip Switch:DSWB
12345678FunctionOption
OnOff      DifficultyEasy
OffOn      Hard
OnOn      Hardest
OffOff      Medium*
  OffOff    Magazines/Rockets5/3*
  OnOff    6/4
  OffOn    7/5
  OnOn    8/6
    OnOn  Bullets per Magazine30
    OffOn  35
    OffOff  40*
    OnOff  50
       OnLanguageEnglish*
       OffJapanese
ROM Version: Operation Thunderbolt (World, rev 1)
Print
Dip Switch:DSWA
12345678FunctionOption
 On      Allow ContinueNo
 Off      Yes*
Dip Switch:DSWB
12345678FunctionOption
OnOff      DifficultyEasy
OffOn      Hard
OnOn      Hardest
OffOff      Medium*
  OffOff    Magazines/Rockets5/3*
  OnOff    6/4
  OffOn    7/5
  OnOn    8/6
    OnOn  Bullets per Magazine30
    OffOn  35
    OffOff  40*
    OnOff  50
       OnLanguageEnglish*
       OffJapanese
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