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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 a 220 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 220
    • 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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