upper side of the motherboard. In addition you also find an indication which version or revision the board is.....i.e. Rev 1.0, Rev 2.0, etc.
Re value to collectors...not sure.
I have 5 motherboards from the 80s and 90s.
How do I go about recognising their maker and model?
How do I find out whether any of these are likely to be valuable to collectors?