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 Gaelco, Released in 1991
ROM Version: Big Karnak
Print
Dip Switch:SERVICE
12345678FunctionOption
 Off      Go to test mode nowOff*
 On      On
Dip Switch:SW1
12345678FunctionOption
OffOffOffOff    Coin B1 Coin/1 Credit*
OffOffOffOn    1 Coin/2 Credits
OffOffOnOff    1 Coin/3 Credits
OffOffOnOn    1 Coin/4 Credits
OffOnOffOff    1 Coin/5 Credits
OffOnOffOn    1 Coin/6 Credits
OffOnOnOff    2 Coins/1 Credit
OnOffOffOn    2 Coins/3 Credits
OffOnOnOn    3 Coins/1 Credit
OnOffOffOff    4 Coins/1 Credit
OnOnOnOn    Free Play (if Coin A too)
    OffOffOffOffCoin A1 Coin/1 Credit*
    OffOffOffOn1 Coin/2 Credits
    OffOffOnOff1 Coin/3 Credits
    OffOffOnOn1 Coin/4 Credits
    OffOnOffOff1 Coin/5 Credits
    OffOnOffOn1 Coin/6 Credits
    OffOnOnOff2 Coins/1 Credit
    OnOffOffOn2 Coins/3 Credits
    OffOnOnOn3 Coins/1 Credit
    OnOffOffOff4 Coins/1 Credit
    OnOnOnOnFree Play (if Coin B too)
Dip Switch:SW2
12345678FunctionOption
 On      ImpactOff
 Off      On*
  Off     Demo SoundsOff
  On     On*
   OffOff   Lives1
   OnOff   2
   OffOn   3*
   OnOn   4
     OffOffOffDifficulty0
     OffOffOn1*
     OffOnOff2
     OffOnOn3
     OnOffOff4
     OnOffOn5
     OnOnOff6
     OnOnOn7
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