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 Sega, Released in 1980
ROM Version: N-Sub (upright)
Print
Dip Switch:SW
12345678FunctionOption
OnOnOn     Coin A0C_1C
OffOnOn     1 Coin/1 Credit*
OnOffOn     2 Coins/1 Credit
OffOffOn     3 Coins/1 Credit
OnOnOff     4 Coins/1 Credit
OffOnOff     5 Coins/1 Credit
OnOffOff     6 Coins/1 Credit
OffOffOff     7 Coins/1 Credit
   OffOnOnOn Coin B1 Coin/1 Credit*
   OnOffOnOn 1 Coin/2 Credits
   OffOffOnOn 1 Coin/3 Credits
   OnOnOffOn 1 Coin/4 Credits
   OffOnOffOn 1 Coin/5 Credits
   OnOffOffOn 1 Coin/6 Credits
   OffOffOffOn 1 Coin/7 Credits
   OnOnOnOn 1C_0C
   OnOnOnOff Shared With Coin A
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