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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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Alien Storm
Manufactured by bootleg, Released in 1990
ROM Version: Alien Storm (bootleg, set 1)
Print
Dip Switch:SW1
12345678FunctionOption
OffOffOffOff    Coin A1 Coin/1 Credit*
OffOnOnOn    1 Coin/1 Credit 2/3
OnOffOnOn    1 Coin/1 Credit 4/5
OffOffOnOn    1 Coin/1 Credit 5/6
OnOffOffOff    1 Coin/2 Credits
OffOnOffOff    1 Coin/3 Credits
OnOnOffOff    1 Coin/4 Credits
OffOffOnOff    1 Coin/5 Credits
OnOffOnOff    1 Coin/6 Credits
OffOnOnOff    2 Coins/1 Credit
OnOnOffOn    2 Coins/1 Credit 4/3
OffOnOffOn    2 Coins/1 Credit 5/3 6/4
OnOffOffOn    2 Coins/3 Credits
OnOnOnOff    3 Coins/1 Credit
OffOffOffOn    4 Coins/1 Credit
OnOnOnOn    Free Play (if Coin B too) or 1/1
Dip Switch:SW2
12345678FunctionOption
Off       Start Credit1*
On       2
 Off      Demo SoundsOff
 On      On*
  OnOffOn   DifficultyEasier
  OffOnOn   Easiest
  OffOffOn   Easy
  OnOnOff   Hard
  OffOnOff   Harder
  OnOffOff   Hardest
  OffOffOff   Normal*
  OnOnOn   Special
     On  Coin Chutes1
     Off  3*
ROM Version: Alien Storm (bootleg, set 2)
Print
Dip Switch:SW1
12345678FunctionOption
OffOffOffOff    Coin A1 Coin/1 Credit*
OffOnOnOn    1 Coin/1 Credit 2/3
OnOffOnOn    1 Coin/1 Credit 4/5
OffOffOnOn    1 Coin/1 Credit 5/6
OnOffOffOff    1 Coin/2 Credits
OffOnOffOff    1 Coin/3 Credits
OnOnOffOff    1 Coin/4 Credits
OffOffOnOff    1 Coin/5 Credits
OnOffOnOff    1 Coin/6 Credits
OffOnOnOff    2 Coins/1 Credit
OnOnOffOn    2 Coins/1 Credit 4/3
OffOnOffOn    2 Coins/1 Credit 5/3 6/4
OnOffOffOn    2 Coins/3 Credits
OnOnOnOff    3 Coins/1 Credit
OffOffOffOn    4 Coins/1 Credit
OnOnOnOn    Free Play (if Coin B too) or 1/1
Dip Switch:SW2
12345678FunctionOption
Off       Start Credit1*
On       2
 Off      Demo SoundsOff
 On      On*
  OnOffOn   DifficultyEasier
  OffOnOn   Easiest
  OffOffOn   Easy
  OnOnOff   Hard
  OffOnOff   Harder
  OnOffOff   Hardest
  OffOffOff   Normal*
  OnOnOn   Special
     On  Coin Chutes1
     Off  3*
ROM Version: Alien Storm (Japan, 2 Players) (bootleg of FD1094 317-0146 set)
Print
Dip Switch:SW2
12345678FunctionOption
Off       2 Credits to StartOff*
On       On
 Off      Demo SoundsOff
 On      On*
  OnOffOn   DifficultyEasier
  OffOnOn   Easiest
  OffOffOn   Easy
  OnOnOff   Hard
  OffOnOff   Harder
  OnOffOff   Hardest
  OffOffOff   Normal*
  OnOnOn   Special
     On  Coin Chutes1
     Off  3*
ROM Version: Alien Storm (US, 3 Players) (bootleg of FD1094 317-0147 set)
Print
Dip Switch:SW2
12345678FunctionOption
Off       2 Credits to StartOff*
On       On
 Off      Demo SoundsOff
 On      On*
  OnOffOn   DifficultyEasier
  OffOnOn   Easiest
  OffOffOn   Easy
  OnOnOff   Hard
  OffOnOff   Harder
  OnOffOff   Hardest
  OffOffOff   Normal*
  OnOnOn   Special
     On  Coin Chutes1
     Off  3*
ROM Version: Alien Storm (World, 3 Players) (bootleg of FD1094 317-0148 set)
Print
Dip Switch:SW2
12345678FunctionOption
Off       2 Credits to StartOff*
On       On
 Off      Demo SoundsOff
 On      On*
  OnOffOn   DifficultyEasier
  OffOnOn   Easiest
  OffOffOn   Easy
  OnOnOff   Hard
  OffOnOff   Harder
  OnOffOff   Hardest
  OffOffOff   Normal*
  OnOnOn   Special
     On  Coin Chutes1
     Off  3*
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