I was called in today to look at a machine that had this in it. I couldn't find anything about it. Sorry I forgot to post the name so we can search for it later. It is called Lele MoPS
I envision a custom programming terminal plugging into that port on the cpu...reminds me of the ISSC controllers I used to support with 8 bit cards, only yours is about 1/3 the size and I dig the color.
We had four of them mounted on big 2" angle iron frames with the tape drive already set up and ready, and the forty pound 4" CRT monitor/keyboard on top...
It's a Tele, not Lele. Verify by looking at the logo for this relay from Newark.
Datasheet shows manufacturers website. tele-online.com. They are in Austria.