Mystery IBM processor

[Dave Wade]

> -----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:
> >
> > 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.

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 It looks like a 3090 chip but I thought those were withdrawn before the date code of "90xx".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-Mainframe-Microprocessor-/182138577581

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...

> 
> Mike

Dave
G4UGM