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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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American Speedway
Manufactured by Enerdyne Technologies Inc., Released in 1987
ROM Version: American Speedway (set 1)
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Dip Switch:SW1
12345678FunctionOption
   On    Steering TestOff*
   Off    On
     On  Demo SoundsOff
     Off  On*
      On Show ArrowsOff*
      Off On
       OnCharacter TestOff*
       OffOn
Dip Switch:SW2
12345678FunctionOption
  OffOff    Time To Qualify20 sec
  OffOn    30 sec
  OnOff    45 sec
  OnOn    60 sec*
    OnOn  DifficultyEasy*
    OffOn  Hard
    OffOff  Hardest
    OnOff  Normal
      OffOnCoinage1 Coin/1 Credit
      OnOn1 Coin/1 Credit*
      OnOff1 Coin/2 Credits
      OffOff2 Coins/1 Credit
ROM Version: American Speedway (set 2)
Print
Dip Switch:SW1
12345678FunctionOption
   On    Steering TestOff*
   Off    On
     On  Demo SoundsOff
     Off  On*
      On Show ArrowsOff*
      Off On
       OnCharacter TestOff*
       OffOn
Dip Switch:SW2
12345678FunctionOption
   Off    Time To Qualify45 sec
   On    60 sec*
    OnOn  DifficultyEasy*
    OffOn  Hard
    OffOff  Hardest
    OnOff  Normal
      OffOnCoinage1 Coin/1 Credit
      OnOn1 Coin/1 Credit*
      OnOff1 Coin/2 Credits
      OffOff2 Coins/1 Credit
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