Set of mystery DEC boards: who can help me identifying these?

[P Gebhardt]

>>the 50xxxxx number with the letter behind it could be a dec board number.
>
>
>The 50 class could be the artwork, and the letter the board rev.  If that is the case, there is probably a 54- class on the other side of the board one number higher. The 54  number is the board with components, and can be tracked down, but not easily. 
>


Thanks for this hint, Paul. I rechecked for numbers, but couldn't any 54-numbers on the boards.

>>They could have been renamed by another company. 
>


It looks very much to me like original DEC equipment.


>>Any other print in the etch?
>


Interestingly, the prints in the etches are those I stated and all have an X prior to the actual number.

>>Any pictures?
>


Yes, I uploaded some at 

http://www.digitalheritage.de/other/dec_mystery_boards/


I still have not clue what these boards are for. Any help is highly appreciated!

Thanks,
Pierre


>>
>
>On Sat, May 28, 2016 at 5:51 AM, P Gebhardt <p.gebhardt at ymail.com> wrote:
>
>Hello list,
>>
>>I recently got a bunch of boards from somebody who was either not able to tell me where they were from.
>>The boards seem to be unibus-based with numbers starting with X. I neither came across these before, nor could find any information in the web about it:
>>
>>Type, P/N     , Description
>>X029, 5013132B, AUC interconnect
>>X022, 5012197C, unibuswindow
>>X021, 5012181C, CD ROM control (did that ever exist for unibus?)
>>
>>X020, 5012180B, data path
>>
>>
>>
>>Two 16K mos memory modules M7847 came with the set.
>>
>>
>>No backplane, unfortunately.
>>Any hints about the type of system and application these boards were for?
>>Many thanks for any pointers.
>>
>>Wish a nice weekend to all of you,
>>Pierre
>>
>>
>>-------------------------------------------------------------------------------
>>
>>Pierre's collection of classic computers moved to: http://www.digitalheritage.de
>>
>
>
>