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FunctionalLimits
January 31st, 2014, 08:14 AM
I'm trying to help someone identify a pair of plug-in modules:

17047

Additional photos here: http://www.vintage-computer.com/vcforum/album.php?albumid=219

They're definitely from a Burroughs system; if you look carefully, you can see the "B" logo on the upper plate (right-hand side). They seem very similar to this flip-flop module from a B250:

17048
(source: http://www.silogic.com/Athena/Athena.html)

However, I've seen photos of similar modules from other systems such as the B5000.

I realize that the photos I have may be inadequate for identification purposes, but maybe somebody in this forum can shed some light on their most likely source. Sadly, I have never met any of these old Burroughs systems in person, so the details of their components are unfamiliar to me. (Actually, I would love to find schematics for some of these modules.)

BTW, if anybody here collects this sort of thing, I know that the current owner would like to sell them.

Another question, slightly OT: The same person has sent me photos of a number of boards from various sources (UNIVAC, a Datapoint terminal, and some mystery NCR machine). Would I be violating etiquette if I posted them somewhere at VCF to ask for help in identifying them?

Al Kossow
January 31st, 2014, 08:48 AM
I'm trying to help someone identify a pair of plug-in modules:


I did a bunch of research on this in December
http://bitsavers.org/pdf/burroughs/B5000_5500_5700/service/logic/

Since this is the logic used in the B5000 series.

FunctionalLimits
January 31st, 2014, 08:54 AM
You really *are* a wizard. Thank you!

nigwil
January 31st, 2014, 11:38 PM
We usually associate them with the B5000 series, but as the B200/300 were built on a co-located production line and I wonder if they used the same logic modules? Are there any other letters/numeral designations on the module that might suggest a match?

http://retro-b5500.blogspot.com

Al Kossow
February 1st, 2014, 07:31 AM
We usually associate them with the B5000 series, but as the B200/300 were built on a co-located production line and I wonder if they used the same logic modules?[/URL]

I'm pretty sure they did, along with the disk drives. The Athena photo shows a module out of a B250

FunctionalLimits
February 1st, 2014, 09:58 AM
OK, I sent an e-mail inquiry to Mark DiVecchio at the Athena site. I'll also write to the owner of the modules now to ask for closeups of any identifying marks.

FunctionalLimits
February 1st, 2014, 07:07 PM
Some further info on the modules: The number 11889581 is embossed on the handles. This does not match any of the ID nos. of the schematics in B5000_Parallel_Plate_Packages.pdf. I've gone thru all the schematics in the pdf and compared them vs the photos of the modules, and indeed there is no match. However, it is clear that the same components were used in these modules and those in the B5000 pdf (e.g., the upper plate on these modules matches the upper plate of several of those in the schematics).

I can't find corresponding schematics for the B2xx online, but it looks as if Univ. of Minnesota may have them in their Burroughs Corp. Records collection: http://special.lib.umn.edu/findaid/xml/cbi00090-036.xml#series3

Also, Mark very kindly responded to my inquiry. He isn't sure if the B250 and B5000 used the same modules. He did include this, though, which is in line with nigwil's observation:
[QUOTE]This youtube video seems to place them both being manufactured at the same time in Pasadena. http://www.youtube.com/watch?v=K3q5n1mR9iM[\QUOTE]