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.

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

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. They could have been renamed by another company. Any other print in the etch? Any pictures? 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 >

Hello all, Thanks to everybody who tried to help figuring out from what installation these DEC boards with Unibus-type connecction are. I'm somehow amazed that there seem to be some board types from DEC around that seem pretty much unknown. I also didn't find any information in the DEC part number catalogs on bitsavers. I confirm that the X-type numbers (x020, X029 etc) are found on the metal etches of the boards. Anyway, I will keep the photos of the boards at the below link. Maybe somebody who steps over it someday can tell us what these boards are from :) http://www.digitalheritage.de/other/dec_mystery_boards/ Thanks again to the list for your help so far on this, Pierre