ECL ram chips from the insides of a arbitrary waveform generator?
Am I close?
Joe wrote:
>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" <rigdonj_at_cfl.rr.com>
>>To: <cctalk_at_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
Received on Mon Jul 14 2003 - 23:20:01 BST
