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OpenVMS Hobbyist Program | Alpha Systems Forums | Alpha Hardware Forum
Author Questions about some chips
PIEBALDconsult
Member

Posts: 11
Location: Phoenix, AZ
Joined: 21.03.08
Posted on January 05 2012 02:58
When I first bought my AlphaServer 800 it had a blown processor board which I replaced. Since then I've had this dead board sitting around -- I hope to remove the Alpha chip for display purposes.

I was looking at it yesterday and wondered about removing some of the other chips to use on bolo ties. I'm sure I would be asked what they are so I want to know what they are. A few quick online searches only found companies that might have them for sale, but no information on what they are.

So, what is an L1B9762? There are four and they surface mount, so should be easy(er) to remove.
And what is an L1A9756?
These are on a 54-24801-01 board.

And any ideas about unsoldering the CPU would be appreciated as well -- damage to the board is not a concern.
Author RE: Questions about some chips
abrsvc
Member

Posts: 97
Joined: 12.03.10
Posted on January 06 2012 02:42
For $17 you can egt a product called CHIPQUIK which will allow you to remove the surface mounted ICs without damage. This is the easiest to use. Basically, this product will "replace" the solder and prevent it from sticking to the pads.

Dan
Author RE: Questions about some chips
eMGee
Member

Posts: 87
Location: The Netherlands
Joined: 28.03.10
Posted on January 06 2012 05:14
Thanks for the advice abrsvc, that sounds interesting and useful. I'm going to try it sometime.


Author RE: Questions about some chips
abrsvc
Member

Posts: 97
Joined: 12.03.10
Posted on January 06 2012 08:29
I use the mentioned product all the time when repairing electronics devices. I have successfully repaired professional cameras, computer boards and high end audio using this to replace blown ICs. Soldering the ICs back on is another story that requires additional equipment, skill and patience...
Author RE: Questions about some chips
saq
Member

Posts: 53
Joined: 24.05.08
Posted on January 08 2012 06:20
While the AS800 doesn't have exhaustive technical information, based on what else was coming out of DIGITAL at the time I wouldn't be surprised if they were similar to the 21171/21172 ALCOR core logtic, with the set of 4 being data chips while the singleton is a control chip.
Author RE: Questions about some chips
saq
Member

Posts: 53
Joined: 24.05.08
Posted on January 13 2012 06:24
Checked out on my AS1000A and PC164 - those chips are the DEC 21172 ALCOR chipset. The 4 are the data chips, the single BGA is the control chip.

If you look on the second line they will say "21172-(x)A" where X is probably "B" (data) or "C" (control).

For desoldering get yourself a hardware store heat gun. Unless you're planning on using the 21164 in another project you don't really need to worry about functionality there either.
Edited by saq on January 13 2012 06:26
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basilh
June 05 2018
Any other forum members in Perth, Australia?

LouF91
April 05 2018
ah maybe they love that!

malmberg
March 24 2018
Probably. More people hang out on the comp.os.vms newsgroup.

vaxpert
March 23 2018
I have a PE42A and other Alpha system stuff for sale. I'm in So California. Any interest out there?

goodbyespy
February 27 2018
To Prohorenko. Please, visit group OpenVMS in the ok.ru

peteherrera
February 24 2018
How much does it cost to buy a complete OpenVMS hardcopy documentation set of the latest version

prohorenko
February 17 2018
Please help to obtain the license on OpenVMS

malmberg
December 12 2017
HPE only makes the most current version of OpenVMS Alpha / IA64 /VAX available to hobbyists. When I had access to the Alliance 1 program it was the same. No public downloads are allowed by HPE.

nmbonao
December 08 2017
Is anybody knows OpenVMS 8.2 version downloadable version? or CD copy? Thank you very much

aarommes
December 02 2017
Bitcoin and Blockchain enthusiasts ( plus distributed computing ) please connec / reply: http://www.openvmshobbyis
t.com/forum/viewthread.ph
p?forum_id=130&thread_id=
2991


malmberg
September 10 2017
https://sourceforge.net/p
/vms-ports/wiki/VMSInstal
lation/ For the most part just use VMS 6.1 media instead of 7.3. But why run the older release?


DoeveR
August 07 2017
Where can I find the write up on running VMS 6.1 using the simh emulator?

Bart
March 20 2017
Happy to have found my password again!

pintero
March 16 2017
peteherrera. Agreed.

peteherrera
March 04 2017
It would be nice to be able to buy the lastest hardcopy full OpenVMS docset at a very reduced price through the Hobbyist program. smiley

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