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 Sigma Enterprises Inc., Released in 1981
ROM Version: Spiders (set 1)
Print
Dip Switch:SW1
12345678FunctionOption
OffOffOff     Coinage1 Coin/1 Credit*
OnOnOff     1 Coin/2 Credits
OnOffOn     1 Coin/3 Credits
OffOnOn     2 Coins/1 Credit
OnOffOff     4 Coins/5 Credits
OnOnOn     Free Play
Dip Switch:SW2
12345678FunctionOption
OnOn      Play ModeA A'
OffOn      A B'
OnOff      B A'
OffOff      B B'*
  OnOn    Spiders to Complete Belt14
  OffOff    16*
  OffOn    20
  OnOff    26
    Off   Lives3*
    On   4
     OffOff Bonus Life15K*
     OffOn 20K
     OnOff 25K
     OnOn None
       OffGiant SpidersEvery Screen
       OnFirst Screen*
Dip Switch:SW3
12345678FunctionOption
On       Flip ScreenOff*
Off       On
 Off      CabinetCocktail
 On      Upright*
  OnOnOn   Vertical Adjust0*
  OffOnOn   1
  OnOffOn   2
  OffOffOn   3
  OnOnOff   4
  OffOnOff   5
  OnOffOff   6
  OffOffOff   7
     OnOnOnHorizontal Adjust0*
     OffOnOn1
     OnOffOn2
     OffOffOn3
     OnOnOff4
     OffOnOff5
     OnOffOff6
     OffOffOff7
ROM Version: Spiders (set 2)
Print
Dip Switch:SW1
12345678FunctionOption
OffOffOff     Coinage1 Coin/1 Credit*
OnOnOff     1 Coin/2 Credits
OnOffOn     1 Coin/3 Credits
OffOnOn     2 Coins/1 Credit
OnOffOff     4 Coins/5 Credits
OnOnOn     Free Play
Dip Switch:SW2
12345678FunctionOption
OnOn      Play ModeA A'
OffOn      A B'
OnOff      B A'
OffOff      B B'*
  OnOn    Spiders to Complete Belt14
  OffOff    16*
  OffOn    20
  OnOff    26
    Off   Lives3*
    On   4
     OffOff Bonus Life15K*
     OffOn 20K
     OnOff 25K
     OnOn None
       OffGiant SpidersEvery Screen
       OnFirst Screen*
Dip Switch:SW3
12345678FunctionOption
On       Flip ScreenOff*
Off       On
 Off      CabinetCocktail
 On      Upright*
  OnOnOn   Vertical Adjust0*
  OffOnOn   1
  OnOffOn   2
  OffOffOn   3
  OnOnOff   4
  OffOnOff   5
  OnOffOff   6
  OffOffOff   7
     OnOnOnHorizontal Adjust0*
     OffOnOn1
     OnOffOn2
     OffOffOn3
     OnOnOff4
     OffOnOff5
     OnOffOff6
     OffOffOff7
ROM Version: Spiders (set 3)
Print
Dip Switch:SW1
12345678FunctionOption
OffOffOff     Coinage1 Coin/1 Credit*
OnOnOff     1 Coin/2 Credits
OnOffOn     1 Coin/3 Credits
OffOnOn     2 Coins/1 Credit
OnOffOff     4 Coins/5 Credits
OnOnOn     Free Play
Dip Switch:SW2
12345678FunctionOption
OnOn      Play ModeA A'
OffOn      A B'
OnOff      B A'
OffOff      B B'*
  OnOn    Spiders to Complete Belt14
  OffOff    16*
  OffOn    20
  OnOff    26
    Off   Lives3*
    On   4
     OffOff Bonus Life15K*
     OffOn 20K
     OnOff 25K
     OnOn None
       OffGiant SpidersEvery Screen
       OnFirst Screen*
Dip Switch:SW3
12345678FunctionOption
On       Flip ScreenOff*
Off       On
 Off      CabinetCocktail
 On      Upright*
  OnOnOn   Vertical Adjust0*
  OffOnOn   1
  OnOffOn   2
  OffOffOn   3
  OnOnOff   4
  OffOnOff   5
  OnOffOff   6
  OffOffOff   7
     OnOnOnHorizontal Adjust0*
     OffOnOn1
     OnOffOn2
     OffOffOn3
     OnOnOff4
     OffOnOff5
     OnOffOff6
     OffOffOff7
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