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 Mylstar, Released in 1983
ROM Version: Screw Loose (prototype)
Print
Dip Switch:DSW
12345678FunctionOption
On       Demo SoundsOff
Off       On*
 Off      Demo modeOff*
 On      On
  On     1st Bonus Atom at20000
  On     1st Bonus Hand at25000*
  Off     1st Bonus Atom at5000*
  Off     1st Bonus Hand at50000
   Off    Free PlayOff*
   On    On
 Off On    Coinage1 Coin/1 Credit*
 Off Off    1 Coin/2 Credits
 On On    2 Coins/1 Credit
 On Off    2 Coins/2 Credits
       OffHands3*
       On5
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