Prusa i3, what board do I have?

I'm trying to get Marlin installed correctly. All of the instructions that came with the printer point to it being a A8 but I have no idea what the board is. The chip on it says atmega1284p. Attached a pic of the board. What board setting do I need to configure Marlin to get it working? Any help would be appreciated. Thanks!

Why are you wanting to install Marlin again? The stock software already installed on the A8 is Marlin based.

So I can calibrate it better.

does anyone know what the 40*10 fan is for, i have it on my migbot and idk what it does.

I finally figured it out. The normal marlin firmware doesn't seem to work because the board isn't a standard one. Finally got it to work with the skynet3D firmware, which seems to be a modification of marlin anyway but with the correct board information in it.