It looks like a socket 7 motherboard. Maybe an Intel. Could basically be anything though. Its hard to tell from a picture. Maybe a V-Tech like my motherboard.
It's a socket7 but like you siad it could be made by anyone, i looked and looked but i can't find any the same on ebay or anywhere else,i seen some that look close but none the same
kind of figured i would have 2 do sumthing along that line,is it alright 2 run it for awhile without a heat sink? it's just a p150 with one of those ceramic tops on it.