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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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Heavy Unit
Manufactured by Kaneko / Taito, Released in 1988
ROM Version: Heavy Unit (Japan, Newer)
Print
Dip Switch:DSW1
12345678FunctionOption
Off       CabinetCocktail
On       Upright*
 Off      Flip ScreenOff*
 On      On
  Off     Service ModeOff*
  On     On
    OffOff  Coin A1 Coin/1 Credit*
    OnOff  1 Coin/2 Credits
    OffOn  2 Coins/1 Credit
    OnOn  2 Coins/3 Credits
      OffOffCoin B1 Coin/1 Credit*
      OffOff1 Coin/1 Credit*
      OffOff1 Coin/1 Credit*
      OnOff1 Coin/2 Credits
      OffOn1 Coin/2 Credits
      OffOn1 Coin/3 Credits
      OnOn1 Coin/4 Credits
      OnOn1 Coin/6 Credits
      OnOff2 Coins/1 Credit
      OnOff2 Coins/1 Credit
      OffOn2 Coins/1 Credit
      OnOn2 Coins/3 Credits
Dip Switch:DSW2
12345678FunctionOption
OnOff      DifficultyEasy
OffOn      Hard
OnOn      Hardest
OffOff      Normal*
  On     Allow ContinueOff
  Off     On*
   Off    BonusOff
   On    On*
    OffOff  Lives3*
    OnOff  4
    OffOn  5
    OnOn  7
      On Demo SoundsOff
      Off On*
ROM Version: Heavy Unit (Japan, Older)
Print
Dip Switch:DSW1
12345678FunctionOption
Off       CabinetCocktail
On       Upright*
 Off      Flip ScreenOff*
 On      On
  Off     Service ModeOff*
  On     On
    OffOff  Coin A1 Coin/1 Credit*
    OffOff  1 Coin/1 Credit*
    OffOn  1 Coin/2 Credits
    OffOn  1 Coin/3 Credits
    OnOn  1 Coin/4 Credits
    OnOn  1 Coin/6 Credits
    OnOff  2 Coins/1 Credit
    OnOff  2 Coins/1 Credit
      OffOffCoin B1 Coin/1 Credit*
      OffOff1 Coin/1 Credit*
      OffOn1 Coin/2 Credits
      OffOn1 Coin/3 Credits
      OnOn1 Coin/4 Credits
      OnOn1 Coin/6 Credits
      OnOff2 Coins/1 Credit
      OnOff2 Coins/1 Credit
Dip Switch:DSW2
12345678FunctionOption
OnOff      DifficultyEasy
OffOn      Hard
OnOn      Hardest
OffOff      Normal*
  On     Allow ContinueOff
  Off     On*
   Off    BonusOff
   On    On*
    OffOff  Lives3*
    OnOff  4
    OffOn  5
    OnOn  7
      On Demo SoundsOff
      Off On*
ROM Version: Heavy Unit (World)
Print
Dip Switch:DSW1
12345678FunctionOption
Off       CabinetCocktail
On       Upright*
 Off      Flip ScreenOff*
 On      On
  Off     Service ModeOff*
  On     On
    OffOff  Coin A1 Coin/1 Credit*
    OffOff  1 Coin/1 Credit*
    OffOn  1 Coin/2 Credits
    OffOn  1 Coin/3 Credits
    OnOn  1 Coin/4 Credits
    OnOn  1 Coin/6 Credits
    OnOff  2 Coins/1 Credit
    OnOff  2 Coins/1 Credit
      OffOffCoin B1 Coin/1 Credit*
      OffOff1 Coin/1 Credit*
      OffOn1 Coin/2 Credits
      OffOn1 Coin/3 Credits
      OnOn1 Coin/4 Credits
      OnOn1 Coin/6 Credits
      OnOff2 Coins/1 Credit
      OnOff2 Coins/1 Credit
Dip Switch:DSW2
12345678FunctionOption
OnOff      DifficultyEasy
OffOn      Hard
OnOn      Hardest
OffOff      Normal*
  On     Allow ContinueOff
  Off     On*
   Off    BonusOff
   On    On*
    OffOff  Lives3*
    OnOff  4
    OffOn  5
    OnOn  7
      On Demo SoundsOff
      Off On*
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