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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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Chopper I
Manufactured by SNK, Released in 1988
ROM Version: Chopper I (US set 1)
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Dip Switch:DSW1
12345678FunctionOption
Off       Flip ScreenOff*
On       On
 On      CabinetCocktail
 Off      Upright*
   Off    Lives3*
   On    5
    OffOff  Coin A1 Coin/1 Credit*
    OnOff  2 Coins/1 Credit
    OffOn  3 Coins/1 Credit
    OnOn  4 Coins/1 Credit
  Off OffOn  Bonus Life100k 200k
  On OffOn  100k 200k 200k+
  Off OffOff  50k 100k
  On OffOff  50k 100k 100k+*
  Off OnOff  75k 150k
  On OnOff  75k 150k 150k+
  Off OnOn  None
  On OnOn  None
      OnOnCoin B1 Coin/2 Credits*
      OffOn1 Coin/3 Credits
      OnOff1 Coin/4 Credits
      OffOff1 Coin/6 Credits
Dip Switch:DSW2
12345678FunctionOption
OnOff      DifficultyEasy
OffOn      Hard
OnOn      Hardest
OffOff      Normal*
  OnOff    Game ModeDemo Sounds Off
  OffOff    Demo Sounds On*
  OnOn    Freeze
  OffOn    Infinite Lives (Cheat)
      On Allow ContinueNo
      Off Yes*
       OffInvulnerability (Cheat)Off*
       OnOn
ROM Version: Chopper I (US set 2)
Print
Dip Switch:DSW1
12345678FunctionOption
Off       Flip ScreenOff*
On       On
 On      CabinetCocktail
 Off      Upright*
   Off    Lives3*
   On    5
    OffOff  Coin A1 Coin/1 Credit*
    OnOff  2 Coins/1 Credit
    OffOn  3 Coins/1 Credit
    OnOn  4 Coins/1 Credit
  Off OffOn  Bonus Life100k 200k
  On OffOn  100k 200k 200k+
  Off OffOff  50k 100k
  On OffOff  50k 100k 100k+*
  Off OnOff  75k 150k
  On OnOff  75k 150k 150k+
  Off OnOn  None
  On OnOn  None
      OnOnCoin B1 Coin/2 Credits*
      OffOn1 Coin/3 Credits
      OnOff1 Coin/4 Credits
      OffOff1 Coin/6 Credits
Dip Switch:DSW2
12345678FunctionOption
OnOff      DifficultyEasy
OffOn      Hard
OnOn      Hardest
OffOff      Normal*
  OnOff    Game ModeDemo Sounds Off
  OffOff    Demo Sounds On*
  OnOn    Freeze
  OffOn    Infinite Lives (Cheat)
      On Allow ContinueNo
      Off Yes*
       OffInvulnerability (Cheat)Off*
       OnOn
ROM Version: Chopper I (US set 3)
Print
Dip Switch:DSW1
12345678FunctionOption
Off       Flip ScreenOff*
On       On
 On      CabinetCocktail
 Off      Upright*
   Off    Lives3*
   On    5
    OffOff  Coin A1 Coin/1 Credit*
    OnOff  2 Coins/1 Credit
    OffOn  3 Coins/1 Credit
    OnOn  4 Coins/1 Credit
  Off OffOn  Bonus Life100k 200k
  On OffOn  100k 200k 200k+
  Off OffOff  50k 100k
  On OffOff  50k 100k 100k+*
  Off OnOff  75k 150k
  On OnOff  75k 150k 150k+
  Off OnOn  None
  On OnOn  None
      OnOnCoin B1 Coin/2 Credits*
      OffOn1 Coin/3 Credits
      OnOff1 Coin/4 Credits
      OffOff1 Coin/6 Credits
Dip Switch:DSW2
12345678FunctionOption
OnOff      DifficultyEasy
OffOn      Hard
OnOn      Hardest
OffOff      Normal*
  OnOff    Game ModeDemo Sounds Off
  OffOff    Demo Sounds On*
  OnOn    Freeze
  OffOn    Infinite Lives (Cheat)
      On Allow ContinueNo
      Off Yes*
       OffInvulnerability (Cheat)Off*
       OnOn
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