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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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Plus Alpha
Manufactured by Jaleco, Released in 1989
ROM Version: Plus Alpha
Print
Dip Switch:DSW
12345678FunctionOption
        Coin B1 Coin/1 Credit*
        Coin A1 Coin/1 Credit*
        Coin B1 Coin/2 Credits
        Coin A1 Coin/2 Credits
        Coin B1 Coin/3 Credits
        Coin A1 Coin/3 Credits
        Coin B1 Coin/4 Credits
        Coin A1 Coin/4 Credits
        Coin B1 Coin/5 Credits
        Coin A1 Coin/5 Credits
        2 Coins/1 Credit
        Coin B2 Coins/1 Credit
        Coin A3 Coins/1 Credit
        Coin B3 Coins/1 Credit
        4 Coins/1 Credit
        Coin AFree Play
        Demo SoundsOff
        Freeze Screen (Cheat)Off*
        Demo SoundsOn*
        Freeze Screen (Cheat)On
OffOff      Lives3*
OnOff      4
OffOn      5
OnOn      Infinite (Cheat)
  On     Hyper Laser Beams2
  Off     3*
   On    Bonus Life100k and 300k Only
   Off    70k and every 200k*
    OnOn  DifficultyEasy
    OnOff  Hard
    OffOn  Hard
    OffOn  Harder
    OnOff  Hardest
    OnOn  Hardest
    OffOff  Normal*
    OffOff  Normal*
      Off CabinetCocktail
      On Upright*
       OffFlip ScreenOff*
       OnOn
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