Can anyone id these HP ICs?

From: Joe <rigdonj_at_cfl.rr.com>
Date: Thu Jul 10 19:23:00 2003

  Picked up an HP circuit card today with some NEAT looking ICs. The ICs
are 16 pin DIP packages but are made entirely of gold and ceramic. They
have a gold bottom plate then a layer of white ceramic with what appears to
be a gold ring around the top then a gold lid soldered to that. The legs
are also all gold. They sit on gold plates that are slightly smalled than
the ICs and the plates have a single leg coming off of each end that is
soldered to the circuit board. The IC legs don't even mount in regular IC
sockets instead there is a gold leaf terminal for each leg. I've never seen
that type of terminals used for ICs before but HP does use them for
individual wires in some of their products. The wires to the card readers
in the HP-67 and HP-41 card readers are connected that way. I have no idea
what this card came out of other than it's made by HP. The part number
that's on it doesn't help id it either. There are 12 of these strange
looking ICs on the card. They have HP logos and all the part number
1820-2000, 1820-1999 or 1820-0753. I've searched the net for those numbers
and checked the on-line HP part number cross references but didn't find
anything. However the 1820 prefix usually indicates that the part uses TTL
levels.

   Any ideas?

   Joe
Received on Thu Jul 10 2003 - 19:23:00 BST