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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Manufactured by Midway, Released in 1999
ROM Version: Invasion - The Abductors (version 3.0)
Print
Dip Switch:DIPS
12345678FunctionOption
        Show BloodOff
        UnknownOff*
        Off*
        Off*
        Mirrored DisplayOff*
        UnknownOff*
        Off*
        Off*
        On
        Show BloodOn*
        UnknownOn
        On
        On
        On
        Mirrored DisplayOn
        UnknownOn
On       Coinage SourceCMOS
Off       Dipswitch*
 OnOnOnOffOff  CoinageFree Play
 OffOffOffOffOn  French-1
 OnOffOnOffOn  French-11
 OffOnOnOffOn  French-12
 OnOffOffOffOn  French-2
 OffOnOffOffOn  French-3
 OnOnOffOffOn  French-4
 OffOffOnOffOn  French-ECA
 OffOffOffOnOff  German-1
 OnOffOffOnOff  German-2
 OffOnOffOnOff  German-3
 OnOnOffOnOff  German-4
 OnOffOnOnOff  German-5
 OffOffOnOnOff  German-ECA
 OffOffOffOffOff  USA-1*
 OffOnOnOffOff  USA-10
 OnOffOffOffOff  USA-2
 OffOnOffOffOff  USA-3
 OnOnOffOffOff  USA-4
 OnOffOnOffOff  USA-9
 OffOffOnOffOff  USA-ECA
      Off Flip YOff*
      On On
       OffTest SwitchOff*
       OnOn
ROM Version: Invasion - The Abductors (version 4.0)
Print
Dip Switch:DIPS
12345678FunctionOption
        Show BloodOff
        UnknownOff*
        Off*
        Mirrored DisplayOff*
        UnknownOff*
        Off*
        Off*
        Off*
        On
        On
        On
        On
        On
        Show BloodOn*
        UnknownOn
        Mirrored DisplayOn
On       Coinage SourceCMOS
Off       Dipswitch*
 OnOnOnOffOff  CoinageFree Play
 OffOffOffOffOn  French-1
 OnOffOnOffOn  French-11
 OffOnOnOffOn  French-12
 OnOffOffOffOn  French-2
 OffOnOffOffOn  French-3
 OnOnOffOffOn  French-4
 OffOffOnOffOn  French-ECA
 OffOffOffOnOff  German-1
 OnOffOffOnOff  German-2
 OffOnOffOnOff  German-3
 OnOnOffOnOff  German-4
 OnOffOnOnOff  German-5
 OffOffOnOnOff  German-ECA
 OffOffOffOffOff  USA-1*
 OffOnOnOffOff  USA-10
 OnOffOffOffOff  USA-2
 OffOnOffOffOff  USA-3
 OnOnOffOffOff  USA-4
 OnOffOnOffOff  USA-9
 OffOffOnOffOff  USA-ECA
      Off Flip YOff*
      On On
       OffTest SwitchOff*
       OnOn
ROM Version: Invasion - The Abductors (version 5.0)
Print
Dip Switch:DIPS
12345678FunctionOption
        UnknownOff*
        Show BloodOff
        UnknownOff*
        Mirrored DisplayOff*
        UnknownOff*
        Off*
        Off*
        Off*
        Show BloodOn*
        UnknownOn
        On
        On
        On
        On
        On
        Mirrored DisplayOn
On       Coinage SourceCMOS
Off       Dipswitch*
 OnOnOnOffOff  CoinageFree Play
 OffOffOffOffOn  French-1
 OnOffOnOffOn  French-11
 OffOnOnOffOn  French-12
 OnOffOffOffOn  French-2
 OffOnOffOffOn  French-3
 OnOnOffOffOn  French-4
 OffOffOnOffOn  French-ECA
 OffOffOffOnOff  German-1
 OnOffOffOnOff  German-2
 OffOnOffOnOff  German-3
 OnOnOffOnOff  German-4
 OnOffOnOnOff  German-5
 OffOffOnOnOff  German-ECA
 OffOffOffOffOff  USA-1*
 OffOnOnOffOff  USA-10
 OnOffOffOffOff  USA-2
 OffOnOffOffOff  USA-3
 OnOnOffOffOff  USA-4
 OnOffOnOffOff  USA-9
 OffOffOnOffOff  USA-ECA
      Off Flip YOff*
      On On
       OffTest SwitchOff*
       OnOn
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