Found a few more boards; I guess the displays, optocouplers and surge suppressors suggest an industrial system of some sort, perhaps custom or limited production.

Wonder why that type of connector wasn't used more often for a bus instead of presumably more expensive edge connectors; I think I do have some (CDC?) boards that are the opposite, i.e. pins plugging into sockets on the backplane.

https://picasaweb.google.com/115794482077177620188/Mystery68xxCards?authkey=Gv1sRgCKq4r5zr3fjGiwE


----- Original Message ----- From: "Mike Ross" <tmfdm...@gmail.com>
To: "General Discussion: On-Topic and Off-Topic
Posts" <cctalk@classiccmp.org>
Sent: Wednesday, September 23, 2015 11:43 PM
Subject: Re: Anyone recognize this bus/form
factor?


That's odd.

I can't say for sure but... it has the feel of
something that might
have belonged in a terminal or keyboard...
character generator or
something... stab in the dark really.

Mike

On Thu, Sep 24, 2015 at 2:05 PM, Mike Stein
<mhs.st...@gmail.com> wrote:
68xx system, unusual (in my experience) 40-pin
single row header bus.

Anyone recognize it?

https://lh3.googleusercontent.com/-jRSv5KbuziQ/VgNYaQ5j1gI/AAAAAAAAAXY/A5k2n04KROo/s720-Ic42/Mystery68xx.JPG




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