28 May
2016
28 May
'16
4:40 a.m.
-----Original Message-----
From: cctech [mailto:cctech-bounces at classiccmp.org] On Behalf Of Mike Ross
Sent: 28 May 2016 11:29
To: General Discussion: On-Topic Posts <cctech at classiccmp.org>
Subject: Re: Mystery IBM processor
On May 28, 2016 9:51 PM, <malcolm at avitech.com.au> wrote:
I believe the modules are called TCM's or Thermal Conduction Modules. It looks like a
3090 chip but I thought those were withdrawn before the date code of "90xx".
I thought the ES/9000 follow on had a re-designed chip with multiple rows of pins like
this...
http://www.ebay.com/itm/Rare-IBM-9121-TCM-Thermal-Conduction-Module-ES-9000…
but when I look at the IBM web pages:-
http://www-03.ibm.com/ibm/history/exhibits/mainframe/mainframe_PP9000.html
it says only the high end machines have the new TCM so I think it may be a TCM from an
entry level ES/9000 machine...
Just wondering if anyone can help us to identify a rather large IBM
processor assembly. It weighs around 60 pounds.
The frame has a P/N of 34F5089. The frame houses 9 modules, 6 of which
are installed. The module we removed for inspection has a P/N of 34F0615.
Definitely IBM mainframe. The individual square alloy lumps are what are
called MCMs - Multi Chip Modules. Insides are dozens of individual ECL ICs.
Water cooling heatsinks would have been bolted to the front side in life.
Can't remember what IBM called the entire assembly. 1980s, probably a 3080
or 3090 but don't quote me on that.
Mike
Dave
G4UGM