That is a successor system to the Elektor system. There is a whole book in German describing it:
https://archive.org/details/sc-mp-mi...-handbuch-1980
Freek Heite does not happen to have the software on the Elektor Software Service record 5?
1 Luna
2 Battleships
3 Keyplay
4 Runtext
5 Biorhythm
6 Tracer
7 Disassembler
I have 002 and 004 and I think I could regenerate 001, but the programs above appear to have been lost.
Michael