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 Tecmo, Released in 1988
ROM Version: Silk Worm (Japan)
Print
Dip Switch:SW1
12345678FunctionOption
OffOff      Coin A1 Coin/1 Credit*
OffOn      1 Coin/2 Credits
OnOn      1 Coin/3 Credits
OnOff      2 Coins/1 Credit
  OffOff    Coin B1 Coin/1 Credit*
  OffOn    1 Coin/2 Credits
  OnOn    1 Coin/3 Credits
  OnOff    2 Coins/1 Credit
    OnOn  Lives2
    OffOff  3*
    OnOff  4
    OffOn  5
       OffDemo SoundsOff
       OnOn*
Dip Switch:SW2
12345678FunctionOption
OnOffOn     Bonus Life100000
OnOnOff     100000 300000
OnOffOff     100000 300000 800000
OffOnOn     200000
OffOffOn     50000
OffOnOff     50000 200000
OffOffOff     50000 200000 500000*
OnOnOn     None
    OffOffOff Difficulty0
    OffOnOn 0
    OnOnOn 0
    OnOffOff 1
    OffOnOff 2
    OnOnOff 3*
    OffOffOn 4
    OnOffOn 5
       OnAllow ContinueNo
       OffYes*
ROM Version: Silk Worm (World)
Print
Dip Switch:SW1
12345678FunctionOption
OffOff      Coin A1 Coin/1 Credit*
OffOn      1 Coin/2 Credits
OnOn      1 Coin/3 Credits
OnOff      2 Coins/1 Credit
  OffOff    Coin B1 Coin/1 Credit*
  OffOn    1 Coin/2 Credits
  OnOn    1 Coin/3 Credits
  OnOff    2 Coins/1 Credit
    OnOn  Lives2
    OffOff  3*
    OnOff  4
    OffOn  5
       OffDemo SoundsOff
       OnOn*
Dip Switch:SW2
12345678FunctionOption
OnOffOn     Bonus Life100000
OnOnOff     100000 300000
OnOffOff     100000 300000 800000
OffOnOn     200000
OffOffOn     50000
OffOnOff     50000 200000
OffOffOff     50000 200000 500000*
OnOnOn     None
    OffOffOff Difficulty0
    OffOnOn 0
    OnOnOn 0
    OnOffOff 1
    OffOnOff 2
    OnOnOff 3*
    OffOffOn 4
    OnOffOn 5
       OnAllow ContinueNo
       OffYes*
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