Dietz minical 621 minicomputer 1971

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Searching for Siemens DUST 4666 (DUST=Datenübertragung- Steuereinheit, modem control unit, mainframe), there’s also DUET (Datenübertragungseinheit), both another funny acronyms
Funny acronyms of software, mainly database systems

I found this German minicomputer. We just had the 523

19 bit minicomputing - the Mincal 523 from Dietz

Yes, 19 bits, and core memory, with a parity bit too. That’s 4½ digits, in BCD, and a sign bit. It’s a TTL-built machine from 1971, from Dietz, a German company who first offered the Mincal 3 in 1965. [Sturdy minicomputer with lights and switches] This machine is microcoded, with writeable control store! The exceptional design of this computer was revealed only little by little during the reverse engineering (there was practically no documentation and all schematics had to be drawn and recre…

The 621 was obviously much more famous, had an 8bit CPU and 16 bit bus.
Here’s a pic from http://www.marijana-gojkovic.de/andreas/vintage/vintage.php but obviously missing the panel, some more pics and few info there

Here’s a panel and a manual

Dietz mincal 621 Handbücher | ManualsLib
More manuals on bitsavers
Index of /pdf/dietz/621X

Although Dietz was one of the largest German computer companies, I bet most Germans don’t know it.