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  • Home page - www.soemtron.org
  • Soemtron ETR220 - 155,142 were built
    • ETR220 - general downloads
    • ETR220 - downloads for S#105669
    • ETR220 - general gallery
    • ETR220 - gallery for S#105669
    • ETR220 - S#105669 technical description
    • ETR220 - S#54555 technical description
    • ETR220 - S#23325 technical description
    • ETR220 - S#19058 technical description
    • Publicity - a 1967 Soemtron 220 publicity brochure
  • Soemtron ETR221 - Possibly less than 10 ever built
    • Publicity - a 1966 Soemtron 221 publicity brochure
  • Soemtron ETR222 - only 3,203 were built
  • Soemtron ETR224 - only 526 were built
  • Prüfgeräte - test equipment
    • Prüfgeräte - downloads, test equipment design files & circuits
  • Gallery - general gallery for the ETR22x range
  • Downloads
    • Part numbers - a list of all Soemtron part numbers currently available to us from various documents
    • ETR220 - general downloads page
      • Manual - "Technische Instruktion Teil II", 1974 part two of a technical instruction manual, with board layouts, logic diagrams, circuits, assembly drawings and setup instructions
      • Manual - "Ersatzteilekatalog", 1975 manual showing sub assembly drawings of the major parts of an ETR220 including the keyboard, display, decimal point position switch, power supply and bypass regulator.  Part lists of the assemblies are given together with their Soemtron part numbers
      • Manual - "Bedienung und übung", 1972 "Operation and Exercises" by Manfred Sperfeld, translated from German
      • Manual - "Bedienungsanleitung", 1976 "Operating instructions" by VEB Kombinet Zentronik, translated from German
      • Manual - "Design, Maintenance, Service and Operation EKVM 'Soemtron-220'", 1972 Russian technical manual with detailed descriptions of the Soemtron 220's circuits, translated from Russian
      • Manual" - "Instruction Manual, "for use with the SOEMTRON 220 ELECTRONIC CALCULATOR"
    • ETR222 - general downloads page
    • ETR224 - downloads for ETR224 S#32612
  • History - Historical information about Sömmerda, Soemtron and the Rheinmetall company
    • DE1099767B - German patent - "Rechenwerk"
    • FR1251613A - French patent - "Mecanisme de calcul pour l'addition et la soustraction de deux nombres decimaux"
    • GB924164A - English patent - "A Calculating Device"
    • July 1967 - an article in Office Methods and Machines for the Soemtron ETR220
    • 1967, ETR220 brochure - A Soemtron ETR220 brochure possibly from 1967
    • 1966, ETR221 brochure - A Soemtron ETR221 brochure possibly from 1966
  • Site Map - for www.soemtron.org - this page!
  • Links - to other calculator resources
  • Search - the Soemtron website
  • Digital Equipment Corporation PDP-7 - documented installations
  • Surplus Components
    • Capacitors - electrolytic, ceramic, tantalum, polyester and surface mount
    • Connectors - IC sockets, DIP, DIN41612, Molex, Lemo, IEC,IEEE488 sockets, transition and PCB headers
    • Linear IC's - amplifiers, comparators, voltage sensing, crowbar, differential, TV, multiplexers, switches, v-f and f-v
    • Logic IC's - 74 75 4000 14000 series, crystals, counters, drivers, oscillators, gates, latches, RS232 drivers and transceivers, multiplexer demultiplexer, comparators, multipliers, multivibrators, converters, potentiometer, trigger, inverters, registers, latches, drivers, receivers, Ram, flip-flop and comparators
    • Miscellaneous - wire, clamps clips, switches, relays sockets, lamps, studding, buss bar for wire wrap pins, fans and fuses
    • Regulators - -5V, -12V, -15V, +5V, +15V, adjustable, fixed, precision and DC-DC supplies
    • Resistors - potentiometers, surface mount, carbon, metal film, aluminium clad, push button potentiometers, vitreous and networks
    • Transistors, Diodes and Optoelectronics - transistors, diodes, zeners, rectifiers, mosfets, thyristors and opto-electronics
    • Valves (tubes)
  • Privacy statements - cookie policy
  • Report an error - to www.soemtron.org
  • Error Will Robinson, Error! - server error 500
  • We're lost Will Robinson, Lost! - file missing 404
  • Danger, Will Robinson, Danger! - permission denied 403
  • Lodge an enquiry - with www.soemtron.org
  • Personal thoughts - and recollections of Sömmerda and its people, by Bernard Green
  • Successful - form submission
  • Teletype Manuals - ASR33, KSR35, model 43, BRPE and winder

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