Can anyone point me at a list of part #'s so I can find out what these boards
are?  My current guesses:

The one with the 68020 is a motherboard.  No idea how to tell how much memory,
apart from "boot it and see".

The one with nothing but chips is a memory card.

The one with ports labeled "1/2 inch tape" is some kind of disk driver.

The other one is beyond me entirely.

For that matter, anyone who's going to be around MPLS and wants a 3/160
should see me; it looks like I have at least one spare, and I may decide
I have two spares if they use as much power as it looks like they do.

-s