EEVblog Electronics Community Forum

Products => Vintage Computing => Topic started by: emece67 on February 05, 2019, 09:57:48 pm

Title: Help identifying vintage computer board
Post by: emece67 on February 05, 2019, 09:57:48 pm
Hi all,

Some people here think this board is from a VAX, others say it is from a PDP-11...

Does anybody have an idea about what can be the "donor" for this board?

Thanks a lot & regards.
Title: Re: Help identifying vintage computer board
Post by: Kjelt on February 05, 2019, 10:11:38 pm
Augat makes prototyping wirewrap boards.
So on first guess it looks like it is a unique or small series production where this was created for.
I have seen these kinds of boards (not this one specific) made for R&D companies designing their own specific Test and Measurement equipment.

Also the yeardate code of the components (1986) do not suggest it is from the old computer factories IMO.
Title: Re: Help identifying vintage computer board
Post by: dexters_lab on February 07, 2019, 09:17:15 pm
i don't recognise the form factor, though i am sure someone will!
Title: Re: Help identifying vintage computer board
Post by: GregDunn on February 08, 2019, 03:18:23 am
That surely isn't a VAX or PDP compatible board; both have multiple "sections" of pins; Q-bus has 2 of (18?) pairs of pins each, VAX has 4 and FASTbus has 6.
Title: Re: Help identifying vintage computer board
Post by: gardner on February 11, 2019, 05:07:03 am
Not a DEC UNIBUS either.  https://en.wikipedia.org/wiki/Unibus
S-100 doesn't have the keying slot.
Title: Re: Help identifying vintage computer board
Post by: fourtytwo42 on February 12, 2019, 03:33:31 am
I thought the UL1 would be a clue but I have now seen pictures of Augat UL1 boards without an edge connector!
I must admit at the time it was quite common to have prototype boards that although having an edge connector did not meet any particular bus standard as the mating connectors (for the backplane) were widely available in different numbers of ways and pitches. This one seems to have 60 ways, one or two sided ? and pitch ?

I myself built loads of stuff on these with all sorts of proprietary interconnects, remember in those days most backplanes including computers were wirewrapped so anything goes! and not necessarily bused to all slots but function dependent connections, sometimes a processor or graphics, memory function would be chopped up across many slots even using large 15" square pcb's (that were quite common).
Title: Re: Help identifying vintage computer board
Post by: Stray Electron on February 15, 2019, 11:29:57 am
  How many contacts on the edge connectors?  It looks like it might be an S-100 bus card edge connector but the computer boards weren't that tall.  But a lot of manufacturers used blank S-100 format cards for custom boards because the cards were made in high volumes and were probably the cheapest available prototyping board around in the early 1980s.

   I don't any physical ports on that card, or any kind of CPU or RAM or LSI I/O chips or a oscillator crystal so I don't think that it's part of a computer.
Title: Re: Help identifying vintage computer board
Post by: nad007007 on March 08, 2019, 08:08:30 pm
Nice wire wrap.