Searching for dBase sources, I found an online computer museum with interesting office computers with some companies I never heard of before (except Kienzle) like Hohner. There’s a brochure with some more photos. Interesting keyboard and very small display
Website with this and other computers (links on the right):
Mittlere Datentechnik - Homecomputermuseum
He has some other computers like trainers, but most are common. Interesting is the 1974 Siemens Demonstrationmodell and the 1976 Franz Morat computer (we had a thread about both)
Lern- und Experimentiercomputer - Homecomputermuseum
There was a link about the SKS (Steinmetz Krischke Systemtechnik) but since 2023 only on archive org. The Alphatronic/Triumph Adler runs on CP/M. Some links are defunct, maybe works on other archive dates
https://web.archive.org/web/20220310200921/http://wiertalla.de/AlphatronicP2.php
The PDF about a HELL display brochure works on another date
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In Germany in 1960ies and 1970ies, so called “mittlere Datentechnik” was quite a thing with lots of smaller German electronic companies. The term “mittlere Datentechnik” translates to something like “mid sized data technology”, not to be confused with what today would be midrange systems. It was some kind of bridging technology between mechanical booking machines and computers/PC. It originated in banking and accounting.
There was a thing named “Magnetkonto”, which was a sheet of (thicker) paper with a magnetic stripe in the back. Each such card was associated to an account. Movements on this account were printed on the sheet and also stored on the magnetic stripe. The system often could also do some business logic on the lines entered, storing results on this magnetic stripe.
Most famous companies for this type of machines probably were Nixdorf, Kienzle and CTM (Computer technik Müller).
There is only very few generic literature about the topic (besides system manuals) and most of it (if not all) is in German, since it was mostly a German thing. But there is also a fairly new book on the topic in English: Christian Franke and Matthias Röhr (editors) – Small Business Computers made in Europe (1960s–1980s), Nomos, 2024: Small Business Computers made in Europe (1960s–1980s) - 978-3-7560-1489-7 | Nomos
Finally a short remark on the HELL brochure you posted: Hell became famous for foto typesetting systems and was acquired by Linotype in 1990 (maybe Linotype-Hell sounds familiar to some of you). At time of acquisition, Hell was a subsidiary of Siemens and the keyboard on the brochure title page looks very similar to the Siemens keyboard design from the 1980ies.
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