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 Pacific Novelty, Released in 1982
ROM Version: NATO Defense
Print
Dip Switch:DSW1
12345678FunctionOption
OnOn      Coinage1 Coin/1 Credit*
OnOff      1 Coin/2 Credits
OffOn      2 Coins/1 Credit
OffOff      2 Coins/3 Credits
  OnOn    Lives3*
  OffOn    4
  OnOff    5
  OffOff    7
    OnOn  DifficultyEasy*
    OnOff  Hard
    OffOff  Hardest
    OffOn  Medium
      Off CabinetCocktail
      On Upright*
       OnAdd a Coin?No*
       OffYes
Dip Switch:DSW2
12345678FunctionOption
  Off     Demo SoundsOff
  On     On*
OnOn Off    Bonus Life10K
OffOn Off    20K
OnOff Off    30K
OffOff Off    40K
OnOn On    None*
    OnOnOnOffModeBurn-in Test
    OffOnOnOffColor Bar Test
    OffOffOnOffColor Map
    OnOffOnOffCross Hatch
    OffOffOffOnDisplay Options
    OnOffOffOffI/O Board Test
    OnOnOnOnNormal*
    OffOffOffOffReserved
    OffOnOffOffVIDBIT Test
    OnOnOffOffVIDSEL Test
ROM Version: NATO Defense (alternate mazes)
Print
Dip Switch:DSW1
12345678FunctionOption
OnOn      Coinage1 Coin/1 Credit*
OnOff      1 Coin/2 Credits
OffOn      2 Coins/1 Credit
OffOff      2 Coins/3 Credits
  OnOn    Lives3*
  OffOn    4
  OnOff    5
  OffOff    7
    OnOn  DifficultyEasy*
    OnOff  Hard
    OffOff  Hardest
    OffOn  Medium
      Off CabinetCocktail
      On Upright*
       OnAdd a Coin?No*
       OffYes
Dip Switch:DSW2
12345678FunctionOption
  Off     Demo SoundsOff
  On     On*
OnOn Off    Bonus Life10K
OffOn Off    20K
OnOff Off    30K
OffOff Off    40K
OnOn On    None*
    OnOnOnOffModeBurn-in Test
    OffOnOnOffColor Bar Test
    OffOffOnOffColor Map
    OnOffOnOffCross Hatch
    OffOffOffOnDisplay Options
    OnOffOffOffI/O Board Test
    OnOnOnOnNormal*
    OffOffOffOffReserved
    OffOnOffOffVIDBIT Test
    OnOnOffOffVIDSEL Test
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