Are these two baby large socket motherboards

Gold finger cards.... although I am sure you could talk them into down grading them to large socket if you would rather take less money :p

but if you are asking what they are as far as function, they are controller cards of some sorts. I have seen a few of them... essentially they are indeed a mini computer. probably dealing with large amount of input data being collected from and external device. hard to say since PCI cards have such a wide variety of functions.

Best reply ever. :)
Top board is an "88". They are compatibility boards fir sun servers allowing out-of-step co-running of x86 code on sun servers. Originally developed by Microsoft in 1980/81to run ms basic on apple and hos kit computers

The second board Looks like a standardised system riser card used by hp dell and Compaq.
Judging by socket size 486 or Pentium era. But with usb? Not sure you should scrap that. May have some value to collectors as an oddity.