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 Technosoft / Sega, Released in 1990
ROM Version: Thunder Force AC
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Dip Switch:SW2
12345678FunctionOption
Off       Credits to Start1*
On       2
 Off      Demo SoundsOff
 On      On*
  OnOn    Lives10k, 70k, 150k
  OnOn    2
  OnOn    20k, 100k, 200k
  OffOff    3*
  OnOff    4
  OnOn    40k, 150k, 300k
  OffOn    5
  OnOn    None
      OnOffDifficultyEasy
      OffOnHard
      OnOnHardest
      OffOffMedium*
ROM Version: Thunder Force AC (Japan)
Print
Dip Switch:SW2
12345678FunctionOption
Off       Credits to Start1*
On       2
 Off      Demo SoundsOff
 On      On*
  OnOn    Lives10k, 70k, 150k
  OnOn    2
  OnOn    20k, 100k, 200k
  OffOff    3*
  OnOff    4
  OnOn    40k, 150k, 300k
  OffOn    5
  OnOn    None
      OnOffDifficultyEasy
      OffOnHard
      OnOnHardest
      OffOffMedium*
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