Smokeya, I have the 1B and I have no idea also what the heck that thing is for. I am having the hardest time figuring out how to get the dip switches to work on it also. Have you figured it out?
Has anyone figured out what the small 8-pin connecter is for on the newer model 1-slot mvs neogeo boards (such as the MV-1B and MV-1C)? Is it for speakers? Memory card?
The connector on the MV1C is the same as that on the MV1B. It can be used to connect the trackball interface (there's a thread about that stickied here) or the Kizuna 4P interface.