@HoffsterX90

Try something like this:

-bank 1 00110111 -bank 0 11011000

http://www.dragons-lair-project.com/tech/dips/dle20.asp

Thank you. Setting it in the TAB menu seems to work for Mame. Of the FBNeo games I tried, they don't seem to care where the credit comes from, as long as there is a credit to spare, either P1 or P2 can use it. I will keep testing.

Much appreciate your help.

Check the dip switches. You may be able to control the coin chutes. That's something I've seen often in the test/mame menu. This solution would be per ROM though, not per core.