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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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Vegas 1
Manufactured by MGA, Released in 1985
ROM Version: Vegas 1 (Ver 1.33 single coin pulse)
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Dip Switch:DSW1
12345678FunctionOption
OffOnOn     Percentage70%
OnOnOn     70%
OnOffOn     72%*
OffOffOn     74%
OnOnOff     76%
OffOnOff     78%
OnOffOff     80%
OffOffOff     82%
   Off    SoundOff*
   On    On
    Off   SpeechOff*
    On   On
     OnOff JackpotJackpot 1%
     OffOff Jackpot 2,5%
     OnOn Jackpot 5%*
     OffOn On
       OffResetNormal Gameplay*
       OnReset
ROM Version: Vegas 1 (Ver 2.1 dual coin pulse, longer)
Print
Dip Switch:DSW1
12345678FunctionOption
OffOnOn     Percentage70%
OnOnOn     70%
OnOffOn     72%*
OffOffOn     74%
OnOnOff     76%
OffOnOff     78%
OnOffOff     80%
OffOffOff     82%
   Off    SoundOff*
   On    On
    Off   SpeechOff*
    On   On
     OnOff JackpotJackpot 1%
     OffOff Jackpot 2,5%
     OnOn Jackpot 5%*
     OffOn On
       OffResetNormal Gameplay*
       OnReset
ROM Version: Vegas 1 (Ver 2.3 dual coin pulse, shorter)
Print
Dip Switch:DSW1
12345678FunctionOption
OffOnOn     Percentage70%
OnOnOn     70%
OnOffOn     72%*
OffOffOn     74%
OnOnOff     76%
OffOnOff     78%
OnOffOff     80%
OffOffOff     82%
   Off    SoundOff*
   On    On
    Off   SpeechOff*
    On   On
     OnOff JackpotJackpot 1%
     OffOff Jackpot 2,5%
     OnOn Jackpot 5%*
     OffOn On
       OffResetNormal Gameplay*
       OnReset
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