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ludella
Joined: 23 Jul 2011
Posts: 18
Location: Italy
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 Posted: Sat Jul 23, 2011 6:10 pm Post subject: big IBM cpu |
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Anyone seen a chip like this before? I'd like to know from what machine it was desoldered...I was told an IBM mainframe from '70.
And, secondly and more important, a question based on your experience...what is the best way to remove this heatsink without damaging the cpu? Heat gun, drill+self-cutting tapping screw, or...?
I'd like to see the die core under it... |
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doccybrown
Joined: 03 Oct 2005
Posts: 1736
Location: Germany
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| Posted: Sat Jul 23, 2011 7:48 pm Post subject: |
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Hi there!
It's a P13 processor on multichip-module,
it was used in IBM 3181 mainframes!
Somewhere I saw an opened one so it is
possible but for sure not easy because of
glued ceramic I think.
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doccybrown
Joined: 03 Oct 2005
Posts: 1736
Location: Germany
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| Posted: Sat Jul 23, 2011 7:53 pm Post subject: |
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Watch the slideshow on this site to
see how it looks inside!
http://www.cpu-galaxy.at/
It is soldered so maybe putting it
head over onto a hotplate could do it.
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ludella
Joined: 23 Jul 2011
Posts: 18
Location: Italy
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| Posted: Sun Jul 24, 2011 5:18 am Post subject: |
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Thank you!
Here's the photo I think you suggested... I have to find the way to make mine look like this 
Nice, isn't it? |
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naked1300
Joined: 26 Jul 2007
Posts: 837
Location: Austria,
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| Posted: Sun Jul 24, 2011 1:01 pm Post subject: |
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this is my picture and that was really hard work to open that mcm... 
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doccybrown
Joined: 03 Oct 2005
Posts: 1736
Location: Germany
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| Posted: Sun Jul 24, 2011 1:27 pm Post subject: |
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The ceramic top of the MCM looks nice too!
How did you open it Peter?
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naked1300
Joined: 26 Jul 2007
Posts: 837
Location: Austria,
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| Posted: Sun Jul 24, 2011 1:31 pm Post subject: |
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| doccybrown wrote: | The ceramic top of the MCM looks nice too!
How did you open it Peter? |
with a diamond milling cutter....
i am still working on some info - articles for my website of my last projects.
here a short video from me.
http://www.youtube.com/watch?v=vV75q-hbq68
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doccybrown
Joined: 03 Oct 2005
Posts: 1736
Location: Germany
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| Posted: Sun Jul 24, 2011 1:35 pm Post subject: |
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Awesome!
I guess I have to talk with a CNC-guy I know soon
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kosmokrator
Joined: 03 Jul 2008
Posts: 4085
Location: Athens-GR
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| Posted: Sun Jul 24, 2011 1:37 pm Post subject: |
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lol!!!perfect and precice way to open it!!
of cource with some cnc machine!
Always quality stuff From Peter |
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Glory_Cloud
Joined: 24 Jul 2010
Posts: 2942
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| Posted: Sun Jul 24, 2011 2:45 pm Post subject: |
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I believe that this chip came from an IBM 3081; as there is no
IBM 3181 mainframe. 
Seems like I sold an IBM 3081 delivery position (and the mainframe with it
of course) for $1,200,000.00 in 1984 or there abouts. Times have changed for sure!!
Here is a link to picture a whole 3081 mainframe:
http://www.chilton-computing.org.uk/ca/technology/ibm3081/p001.htm
Enjoy the "heavy metal". |
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UMMR
Joined: 23 Aug 2007
Posts: 381
Location: Udine, ITALY
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| Posted: Mon Jul 25, 2011 2:09 am Post subject: |
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Hello,
it's a nice IBM 4381 CPU MultiChip Module, Type P-13 (year introduced, 1984). This MCM has a exclusive heatsink design, patended by IBM in 1983 and called "impinged air-flow cooling".
See http://www.computerhistory.org/collections/accession/102645256.
The 3081 mainframe is instead based on the larger and more complex TCMs (Thermal Conduction Modules), like the whole 308x and 309x families.
Paolo |
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isa-d
Joined: 16 Aug 2006
Posts: 2984
Location: Italy
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| Posted: Sat Jul 30, 2011 7:56 am Post subject: |
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I opened mine very easly, heathsink wasn't glued but soldered all around, I overturned it on a flame and after some seconds I removed the white cpu.
suggestions? use a pair of thermic gloves!! |
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