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 1994
ROM Version: Mortal Kombat 3 (rev 1 chip label p4.0)
Print
Dip Switch:DSW
12345678FunctionOption
        Bill ValidatorOff*
        Attract SoundOff
        Powerup TestOff*
        ViolenceOff
        BloodOff
        Attract SoundOn*
        Bill ValidatorOn
        Powerup TestOn
        BloodOn*
        ViolenceOn*
Off       Test SwitchOff*
On       On
 Off      CountersOne
 On      Two*
  OnOffOffOffOff CoinageFrench-1
  OnOffOffOffOn French-2
  OnOffOffOnOff French-3
  OnOffOffOnOn French-4
  OnOffOnOffOff French-ECA
  OnOffOnOnOn French-Free Play
  OffOnOffOffOff German-1
  OffOnOffOffOn German-2
  OffOnOffOnOff German-3
  OffOnOffOnOn German-4
  OffOnOnOffOff German-5
  OffOnOnOffOn German-ECA
  OffOnOnOnOn German-Free Play
  OffOffOffOffOff USA-1*
  OffOffOffOffOn USA-2
  OffOffOffOnOff USA-3
  OffOffOffOnOn USA-4
  OffOffOnOffOff USA-ECA
  OffOffOnOnOn USA-Free Play
       OnCoinage SourceCMOS*
       OffDipswitch
ROM Version: Mortal Kombat 3 (rev 1.0)
Print
Dip Switch:DSW
12345678FunctionOption
        Powerup TestOff*
        Bill ValidatorOff*
        Attract SoundOff
        ViolenceOff
        BloodOff
        Attract SoundOn*
        BloodOn*
        Powerup TestOn
        ViolenceOn*
        Bill ValidatorOn
Off       Test SwitchOff*
On       On
 Off      CountersOne
 On      Two*
  OnOffOffOffOff CoinageFrench-1
  OnOffOffOffOn French-2
  OnOffOffOnOff French-3
  OnOffOffOnOn French-4
  OnOffOnOffOff French-ECA
  OnOffOnOnOn French-Free Play
  OffOnOffOffOff German-1
  OffOnOffOffOn German-2
  OffOnOffOnOff German-3
  OffOnOffOnOn German-4
  OffOnOnOffOff German-5
  OffOnOnOffOn German-ECA
  OffOnOnOnOn German-Free Play
  OffOffOffOffOff USA-1*
  OffOffOffOffOn USA-2
  OffOffOffOnOff USA-3
  OffOffOffOnOn USA-4
  OffOffOnOffOff USA-ECA
  OffOffOnOnOn USA-Free Play
       OnCoinage SourceCMOS*
       OffDipswitch
ROM Version: Mortal Kombat 3 (rev 2.0)
Print
Dip Switch:DSW
12345678FunctionOption
        Attract SoundOff
        Bill ValidatorOff*
        BloodOff
        Powerup TestOff*
        ViolenceOff
        Powerup TestOn
        Bill ValidatorOn
        ViolenceOn*
        Attract SoundOn*
        BloodOn*
Off       Test SwitchOff*
On       On
 Off      CountersOne
 On      Two*
  OnOffOffOffOff CoinageFrench-1
  OnOffOffOffOn French-2
  OnOffOffOnOff French-3
  OnOffOffOnOn French-4
  OnOffOnOffOff French-ECA
  OnOffOnOnOn French-Free Play
  OffOnOffOffOff German-1
  OffOnOffOffOn German-2
  OffOnOffOnOff German-3
  OffOnOffOnOn German-4
  OffOnOnOffOff German-5
  OffOnOnOffOn German-ECA
  OffOnOnOnOn German-Free Play
  OffOffOffOffOff USA-1*
  OffOffOffOffOn USA-2
  OffOffOffOnOff USA-3
  OffOffOffOnOn USA-4
  OffOffOnOffOff USA-ECA
  OffOffOnOnOn USA-Free Play
       OnCoinage SourceCMOS*
       OffDipswitch
ROM Version: Mortal Kombat 3 (rev 2.1)
Print
Dip Switch:DSW
12345678FunctionOption
        Powerup TestOff*
        Bill ValidatorOff*
        BloodOff
        Attract SoundOff
        ViolenceOff
        On*
        Powerup TestOn
        Attract SoundOn*
        BloodOn*
        Bill ValidatorOn
Off       Test SwitchOff*
On       On
 Off      CountersOne
 On      Two*
  OnOffOffOffOff CoinageFrench-1
  OnOffOffOffOn French-2
  OnOffOffOnOff French-3
  OnOffOffOnOn French-4
  OnOffOnOffOff French-ECA
  OnOffOnOnOn French-Free Play
  OffOnOffOffOff German-1
  OffOnOffOffOn German-2
  OffOnOffOnOff German-3
  OffOnOffOnOn German-4
  OffOnOnOffOff German-5
  OffOnOnOffOn German-ECA
  OffOnOnOnOn German-Free Play
  OffOffOffOffOff USA-1*
  OffOffOffOffOn USA-2
  OffOffOffOnOff USA-3
  OffOffOffOnOn USA-4
  OffOffOnOffOff USA-ECA
  OffOffOnOnOn USA-Free Play
       OnCoinage SourceCMOS*
       OffDipswitch
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