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 Atari, Released in 1983
ROM Version: Major Havoc (prototype)
Print
Dip Switch:SERVICE
12345678FunctionOption
Off       Credit to start1*
On       2
Dip Switch:SW1
12345678FunctionOption
OnOn      Lives3 (2 in Free Play)*
OffOff      4 (3 in Free Play)
OffOn      5 (4 in Free Play)
OnOff      6 (5 in Free Play)
  OffOn    DifficultyDemo
  OnOff    Easy
  OffOff    Hard
  OnOn    Medium*
    OnOn  Bonus Life100000*
    OnOff  200000
    OffOff  50000
    OffOn  None
      Off Demo SoundsOff
      On On*
       OffAdaptive DifficultyOff
       OnOn*
      OnOnLives1*
      OnOff2
      OffOn3
      OffOff4
Dip Switch:SW2
12345678FunctionOption
OnOffOn     Bonus Credits1 each 3
OffOnOff     1 each 4
OnOffOff     1 each 5
OffOnOn     2 each 4
OffOffOff     None*
   Off    Left Coin Mechanismx1*
   On    x2
    OffOff  Right Coin Mechanismx1*
    OffOn  x4
    OnOff  x5
    OnOn  x6
      OffOffCoinage1 Coin/1 Credit*
      OnOn1 Coin/2 Credits
      OffOn2 Coins/1 Credit
      OnOffFree Play
ROM Version: Major Havoc (rev 2)
Print
Dip Switch:SERVICE
12345678FunctionOption
Off       Credit to start1*
On       2
Dip Switch:SW1
12345678FunctionOption
OnOn      Lives3 (2 in Free Play)*
OffOff      4 (3 in Free Play)
OffOn      5 (4 in Free Play)
OnOff      6 (5 in Free Play)
  OffOn    DifficultyDemo
  OnOff    Easy
  OffOff    Hard
  OnOn    Medium*
    OnOn  Bonus Life100000*
    OnOff  200000
    OffOff  50000
    OffOn  None
      Off Demo SoundsOff
      On On*
       OffAdaptive DifficultyOff
       OnOn*
Dip Switch:SW2
12345678FunctionOption
OnOffOn     Bonus Credits1 each 3
OffOnOff     1 each 4
OnOffOff     1 each 5
OffOnOn     2 each 4
OffOffOff     None*
   Off    Left Coin Mechanismx1*
   On    x2
    OffOff  Right Coin Mechanismx1*
    OffOn  x4
    OnOff  x5
    OnOn  x6
      OffOffCoinage1 Coin/1 Credit*
      OnOn1 Coin/2 Credits
      OffOn2 Coins/1 Credit
      OnOffFree Play
ROM Version: Major Havoc (rev 3)
Print
Dip Switch:SERVICE
12345678FunctionOption
Off       Credit to start1*
On       2
Dip Switch:SW1
12345678FunctionOption
OnOn      Lives3 (2 in Free Play)*
OffOff      4 (3 in Free Play)
OffOn      5 (4 in Free Play)
OnOff      6 (5 in Free Play)
  OffOn    DifficultyDemo
  OnOff    Easy
  OffOff    Hard
  OnOn    Medium*
    OnOn  Bonus Life100000*
    OnOff  200000
    OffOff  50000
    OffOn  None
      Off Demo SoundsOff
      On On*
       OffAdaptive DifficultyOff
       OnOn*
Dip Switch:SW2
12345678FunctionOption
OnOffOn     Bonus Credits1 each 3
OffOnOff     1 each 4
OnOffOff     1 each 5
OffOnOn     2 each 4
OffOffOff     None*
   Off    Left Coin Mechanismx1*
   On    x2
    OffOff  Right Coin Mechanismx1*
    OffOn  x4
    OnOff  x5
    OnOn  x6
      OffOffCoinage1 Coin/1 Credit*
      OnOn1 Coin/2 Credits
      OffOn2 Coins/1 Credit
      OnOffFree Play
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