I wonder if anybody has or knows about a (digital or paper) copy of the single-issue German language magazine "Computern mit Kindern" (Computing with Children), published in Germany in late 1984 (probably October) as a joint special issue ("Sonderheft") of the three monthly magazines "Eltern" (Parents, still existing), "PM Magazin" (a fairly good popular science magazine at that time, unfortunately it went pseudoscience a few years later) and "PM Computerheft" (PM Computer Magazine). Among other articles, it contained a (maybe?) historically interesting market overview of currently available home computers from that time period. (Also it was the very first computer magazine I ever owned...) Unfortunately I have lost my copy during a move. Google seems to have only one mention of it, as source of a quotation in a slightly later article for teachers.
I have a small collection of YPS comic books (also published by Gruner+Jahr) and some recollection of what you're looking for.
And sure enough YPS #473, which according to this database came out in November 1984, features this full page ad for "Computern mit Kindern".
So not really an answer to your question, but just to provide an image and to confirm the time frame.
Edit: Found an ad for the above mentioned P. M. Computerheft.
YPS #510 from July 1985.
Looking at the picture in the answer by Uli, this does not appear to be a single-issue magazine, but it is a special issue as part of the magazine called "Eltern". All German periodicals should have an archive copy in the German National Library. As far as copyright permits it, you should be able to get a copy of a single article from the national library, which will require a fee for shipping and handling. I assume they won't send out copies or scans of the full magazine.
Take a look of these cover pages https://www.kultboy.com/index.php?site=kult/kultmags&id=63