Thanks for the hint.
I found the same, but in better scan quality: ftp://ftp.informatik.uni-stuttgart.de/pub/cm/mcs/Alpha1_Handbuch1_Okt1977.pdf

The jumpers S1 to S8 are on the PCB M627 which is on the front plate, staggered together with keyboard/7-segment PCB M626.
It is just a normal IC socket ...

Hey everyone

I recently bought an Grundig telepilot prozessor, which is indeed an Alpha1 from MCS in a 19" housing. The Alpha1 is an modular KIM1 derivate from a german company, brought out in 1977.
I was very lucky to get my hands on it. I could enter some little programs ans save it to tape.
But ...