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Home page - www.soemtron.org Soemtron website timeline page Soemtron ETR 220 - 155,142 were built ETR 220 - S# 105669 technical description ETR 220 - S# 54555 technical description ETR 220 - S# 23325 technical description Soemtron ETR 220 gallery Soemtron ETR 220 downloads Soemtron ETR 221 - Possibly less than 10 ever built Soemtron ETR 222 - Quite rare, only 3,203 were built Soemtron ETR 222 - S# 74005 technical description Soemtron ETR 222 downloads Soemtron ETR 224 - a rare machine in the Soemtron range, only 526 were built ETR 224 - S# 32612 technical description and restoration Soemtron ETR 224 gallery ETR 224 dismantling - S# 32612 dismantling for restoration Soemtron ETR 224 downloads Soemtron Prüfgeräte - Test equipment Soemtron Prüfgeräte downloads - Test equipment design files & circuits Gallery Soemtron ETR 220 ETR 220 S# 105669 gallery Soemtron ETR 221 Soemtron ETR 222 Soemtron ETR 224 224 dismantling for restoration Extender card Production line photos Downloads Soemtron ETR 220 Keyboard, Display and Backplane circuits Boards 1, 2, 3 & power supply circuits Boards 4, 5 & 6 circuits Boards 7, 8 & 9 circuits Boards 10, 11 & 12 circuits Complete circuit diagram Complete logic diagram Net list Snagging list, circuit and logic diagram problems to sort out !. Misc circuits & data sheets Original German logic key & diagrams Translated German manual "Operation and Exercises" This book is ©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 original Russian manual "Maintenance, Service and Operation Soemtron-220" Logic diagram from the Russian manual "Maintenance, Service and Operation Soemtron-220" "Operating instructions" by VEB Kombinet Zentronik (1976) German language operational manual Soemtron ETR 222 Soemtron ETR 224 Keyboard circuit Backplane circuit Power supply and mains wiring Printer wiring Solenoid driver boards Snagging list, circuit and logic diagram problems to sort out !. 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 Soemtron 220 brochure - A Soemtron 220 brochure possibly from 1967 1966 Soemtron 221 brochure - A Soemtron 221 brochure possibly from 1966 Site Map for www.soemtron.org / .com - this page ! Calculator related links Search the Soemtron website Digital Equipment Corporation PDP-7 PDP-7 S# 2 - Stanford University PDP-7 S# 33 - Massachusetts General Hospital PDP-7 S# 41 - National Gas Turbine Establishment, Pyestock PDP-7 S# 47 - Australian Atomic Energy Commission - Lucas Heights PDP-7A S# 103 - Massachusetts General Hospital PDP-7A S# 104 - Massachusetts Institute of Technology, project MAC PDP-7A S# 109 - Massachusetts Institute of Technology, Education Research Center PDP-7A S# 112 - Edinburgh University (UK) PDP-7A S# 113 - University of Oregon PDP-7A S# 115 - Oslo University FlipChip types - Red, Blue, Amber, Green, White, blacK and Magenta range of FlipChip board types History Full options list National Gas turbine Establishment, Pyestock, computers Lodge an enquiry with www.soemtron.org / .com Privacy statements and cookie policy Surplus Components Capacitors - electrolytic, ceramic, tantalum, polyester and surface mount Connectors - IC sockets, DIP, DIN41612, Molex, Lemo, IEC,IEE488 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)