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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: 108
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: 108
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: 60
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: 60
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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malmberg
August 04 2022
No more VAX hobbyist licenses. Community licenses for Alpha/IA64/X86_64 VMS Software Inc. Commercial VMS software licenses for VAX available from HPE.

ozboomer
July 20 2022
Just re-visiting.. No more hobbyist licenses? Is that from vmssoftware.com, no 'community' licenses?

valdirfranco
July 01 2022
No more hobbyist license...sad

mister_wavey
February 12 2022
I recall that the disks failed on the public access VMS systems that included Fafner

parwezw
January 03 2022
Anyone know what happened to FAFNER.DYNDS.ORG? I had a hobbyist account here but can longer access the site.

gtackett
October 27 2021
Make that DECdfs _2.1A_ for Vax

gtackett
October 27 2021
I'm looking for DECdfs V2.4A kit for VAX. Asking here just in case anyone is still listening.

MarkRLV
September 17 2021
At one time, didn't this web site have a job board? I would love to use my legacy skills one last time in my career.

malmberg
January 18 2021
New Hobbyist PAKs for VAX/VMS are no longer available according to reports. Only commercial licenses are reported to be for sale from HPE

dfilip
January 16 2021
Can someone please point me to hobbyist license pak? I'm looking for VAX/VMS 7.1, DECnet Phase IV, and UCX/TCPIP ... have the 7.1 media, need the license paks ... thanks!

Bart
October 16 2020
OpenVMS, and this website!

malmberg
September 05 2020
VSI community non-commercial licenses for AXP/IA64 are available now.

malmberg
September 05 2020
See the forum about licensing. Don't know if HPE hobby licenses still being issued. Commercial licenses still being sold.

silfox70
September 01 2020
I need the license for OpenVMS7.3. Where can I find them?

malmberg
August 29 2020
Eisner, which is currently being moved, got an SSH update and the keys were updated to more modern encryption standards.

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