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Chibizilla

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What I have is a "Mercs" with a dead c board...found software to convert the roms to use different c board...but

Mercs is a 3 player game and the c board had inputs for the 3rd player.

Can you use a Street Fighter 2 WW or Champion edition to handle the 3rd player...or can they be modified to do this?

And where could one get this c board without sacrificing a SF2?
 
Mercs uses the B12 custom on the C board, so you'd need a B12 board from another game if you want to revive your Mercs without changing the Main CPU EPROMs.

https://wiki.arcadeotaku.com/w/CPS1

It looks Street Fighter 2 World Warrior Japan Revision C was the only other CPS1 board to originally ship with the B12 custom.

I think a better option for you would be to get a C Board with the B21 custom and then swap your Mercs Main CPU EPROMs out for a set programmed to work with the B21. B21 compatible CPS1 ROM sets are easy to find and Darksoft sells a B21 C Board ready to go here:

https://www.arcade-projects.com/threads/c-boards-reproduction.24614/

As for having the inputs for the 3rd player on a B21 C board kick harness pins ... I'm not sure honestly. It seems like the Mercs code could be modified to look for the 3rd Player inputs on those pins but I don't know if anyone has done it. Perhaps @Darksoft , @Mitsurugi-w or @djsheep knows.
 
Maybe I didn't clearly state the question...I gotten a different c board to work on Mercs (think it is a b21 from champ ed...but also whatever one Final Fight uses) my question was the inputs from say a SF2WW or Champs Ed c-board would work for the 3rd player on Mercs...or what mods are needed to make that happen.
 
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