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 RDI Video Systems, Released in 1984
ROM Version: Thayer's Quest (set 1)
Print
Dip Switch:A
12345678FunctionOption
OffOffOff     Time Per Coin110 Seconds*
OffOnOn     30 Seconds
OnOffOn     45 Seconds
OffOffOn     60 Seconds
OnOnOff     70 Seconds
OffOnOff     80 Seconds
OnOffOff     95 Seconds
   Off    Coinage1 Coin/1 Credit*
   On    2 Coins/1 Credit
    Off   Lives3*
    On   5
     On  Demo SoundsOff
     Off  On*
      Off Attract Mode AudioAlways Playing*
      On One Out of 8 Times
Dip Switch:B
12345678FunctionOption
   OffOff   LD PlayerLDV-1000
   OnOn   PR-7820*
ROM Version: Thayer's Quest (set 2)
Print
Dip Switch:A
12345678FunctionOption
OffOffOff     Time Per Coin110 Seconds*
OffOnOn     30 Seconds
OnOffOn     45 Seconds
OffOffOn     60 Seconds
OnOnOff     70 Seconds
OffOnOff     80 Seconds
OnOffOff     95 Seconds
   Off    Coinage1 Coin/1 Credit*
   On    2 Coins/1 Credit
    Off   Lives3*
    On   5
     On  Demo SoundsOff
     Off  On*
      Off Attract Mode AudioAlways Playing*
      On One Out of 8 Times
Dip Switch:B
12345678FunctionOption
   OffOff   LD PlayerLDV-1000
   OnOn   PR-7820*
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