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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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King Derby
Manufactured by Tazmi, Released in 1981
ROM Version: King Derby (1981)
Print
Dip Switch:DSW
12345678FunctionOption
Off       SYSTEMOff*
On       On
 Off      UnknownOff*
 On      On
  Off     Off*
  On     On
   Off    Off*
   On    On
    Off   Off*
    On   On
     Off  Game Type?Off*
     On  On
      Off POST CheckOff*
      On On
       OffReset Backup RAMOff*
       OnOn
Dip Switch:HPIO
12345678FunctionOption
Off       HPIOOff*
On       On
 Off      UnknownOff*
 On      On
  Off     Off*
  On     On
   Off    Off*
   On    On
    Off   Off*
    On   On
     Off  Off*
     On  On
Dip Switch:IN1
12345678FunctionOption
 Off      IN1Off*
 On      On
   Off    UnknownOff*
   On    On
      Off Off*
      On On
       OffOff*
       OnOn
Dip Switch:MUX0
12345678FunctionOption
Off       SYSTEMOff*
On       On
 Off      UnknownOff*
 On      On
  Off     Off*
  On     On
   Off    Off*
   On    On
    Off   Off*
    On   On
     Off  Off*
     On  On
      Off Off*
      On On
       OffOff*
       OnOn
Dip Switch:MUX1
12345678FunctionOption
Off       SYSTEMOff*
On       On
 Off      UnknownOff*
 On      On
  Off     Off*
  On     On
   Off    Off*
   On    On
    Off   Off*
    On   On
     Off  Off*
     On  On
      Off Off*
      On On
       OffOff*
       OnOn
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