Hi Ed, I posted a picture at <http://home.cfl.rr.com/rigdon14/t-bird/hp-ic.jpg>. I unplugged the two ICs in the top RH corner and turned them over so that you can see the bottom and side of the ICs and the heat sink that the IC normally sits on. There is a depression in the bottom of the IC case and a rasied pad on the heatsink that fits into the depression. I've never seen anything like this before! Note the delay line (?) on the LH side of the card. Sorry I couldn't get a better picture. This is as close as I could get with my camera. Joe At 07:45 PM 7/13/03 -0700, you wrote: >if you email me a scan of the card I may know what it is. > >Thanks Ed Sharpe archivist for SMECC > >Please check our web site at >http://www.smecc.org >to see other engineering fields, communications and computation stuff we >buy, and by all means when in Arizona drop in and see us. > >address: > >coury house / smecc >5802 w palmaire ave >glendale az 85301 > > > >----- Original Message ----- >From: "Joe" &lt;rigdonj(a)cfl.rr.com&gt; >To: &lt;cctalk(a)classiccmp.org&gt; >Sent: Thursday, July 10, 2003 8:20 PM >Subject: Can anyone id these HP ICs? > > >> 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