It's possible to add turbo A and B in NES games?

I could really need both turbo A and B buttons in a nes game, like “contra”,“shadow of the ninja” etc. so , I wonder how to config the “X” button as “turbo A” and “Y” button as “turbo B”.

BTW, I used to remap the"A" button to “X”, and “B” button to “A”, so that when I can press both A and B easily.

Any advices are greatly appreciated.

Several of the NES cores have turbo-A and turbo-B as remap-able functions already. IIRC, both FCEUmm and Nestopia.

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wow, You really helped me a great favor. I found the core options. thanks a lot!

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