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 Gremlin, Released in 1979
ROM Version: Head On (1 player)
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Dip Switch:IN0
12345678FunctionOption
OnOn      Lives3*
OffOn      4
OnOff      5
OffOff      6
  Off     Demo SoundsOff
  On     On*
ROM Version: Head On (2 players)
Print
Dip Switch:IN0
12345678FunctionOption
OnOn      Lives3*
OffOn      4
OnOff      5
OffOff      6
  Off     Demo SoundsOff
  On     On*
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