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 Electrocoin, Released in 1986
ROM Version: Diamond Derby (Original)
Print
Dip Switch:DSW1
12345678FunctionOption
Off       Unknown 1-1Off*
On       On
 OffOff     Max Prize240p (cash)
 OffOn     300p (cash)
 OnOff     480p (cash + tokens)
 OnOn     600p (cash + tokens)*
   Off    Unknown 1-2Off*
   On    On
When Price Per Game set to 20p
    OnOn  Percentage Payout76%*
    OnOn  78%*
    OffOn  80%
    OffOn  82%
    OnOff  86%
    OnOff  86%
    OffOff  88%
    OffOff  90%
      OnOffPrice Per Game10p*
      OffOff20p
      OnOn2p
      OffOn5p
Dip Switch:DSW2
12345678FunctionOption
On       Show ResultsLast 6 Races
Off       Last Race*
 Off      Unknown 2-2Off*
 On      On
  Off     Unknown 2-3Off*
  On     On
   Off    Unknown 2-4Off*
   On    On
    Off   Unknown 2-5Off*
    On   On
     Off  Unknown 2-6Off*
     On  On
      Off Unknown 2-7Off*
      On On
       OffUnknown 2-8Off*
       OnOn
Dip Switch:IN0
12345678FunctionOption
 Off      Out Coin 1Off*
 On      On
Dip Switch:IN1
12345678FunctionOption
 Off      Out Coin 2Off*
 On      On
Dip Switch:IN2
12345678FunctionOption
 Off      Out Coin 3Off*
 On      On
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