13 Jul
2003
13 Jul
'03
9:58 p.m.
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" <rigdonj(a)cfl.rr.com>
To: <cctalk(a)classiccmp.org>
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