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- Home page - soemtron.org
- Historical information about Soemtron and the Rheinmetall company
- Soemtron ETR 220 information. 155,142 were built
- Soemtron ETR 221 information. A very rare machine
- Soemtron ETR 222 information. Quite rare, only 3,203 built
- Soemtron ETR 224 technical information. A rare machine, only 526 were built
- Picture gallery for our Soemtron ETR calculators
- Download information and circuit diagrams about the Soemtron ETR calculators
- Keyboard, Display and Backplane circuits
- Boards 10, 11 & 12 circuits
- Boards 7, 8 & 9 circuits
- Boards 4, 5 & 6 circuits
- Boards 1, 2, 3 & power supply circuits
- Misc circuits & data sheets
- Original German logic key & diagrams
- Translated German manual for the Soemtron 220 "Operation and Exercises".
This book is copyright 1972 Manfred Sperfeld of V.E.B. Counting Machines, Potsdam.
- Translated Russian manual "Maintenance, Service and Operation EKVM Soemtron-220".
This manual has been reproduced from a 1972 Russian publication, we recognise the copyright of the original publisher.
- Scans of the Russian manual "Maintenance, Service and Operation Soemtron-220"
- Logic diagram from the Russian manual "Maintenance, Service and Operation Soemtron-220"
- Site Map for soemtron.org (this page !)
- Calculator related links
- Search the Soemtron website
- Digital Equipment Corporation PDP-7
- Lodge an Enquiry with soemtron.org
- Disclaimer information
- Surplus Components
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