SNK language programing???

People, please help me!
I'm doing a college work and I decided to talk about SNK, about its evolution and stuff, but certainly my teacher will ask me about programing. Anyone can help me?
I'd like to know the programing language (C, Assembly, etc), if there's any source code available, how many lines of code one game have or anything that could be useful...

I've got a basic demo that was originally uploaded by toady..

I'll put it up soon..