220 Downloads
S# 105669
Soemtron 220 Downloads
 |
This page has general information in downloadable form for the Soemtron ETR 220 electronic calculator. Updates and corrections to this information are uploaded on an ad-hoc basis as various corrections come to hand, but we do not accept responsibility for their subsequent use. The files will usually be in pdf format and a current copy of an Adobe Acrobat reader will be needed [1]. To download the files right click the relevant link and select "file save as ....", or to view the files directly just click the link, assuming you have the pdf viewer installed !.
All files on this website are ©2007- www.soemtron.org and it's group websites [2] or the files respective owners.
 |
If you have any further historical information, circuits, drawings, photographs, data or manuals about the Soemtron ETR 220, 221, 222, 224 or their manufacture, test equipment (Prüfgeräte) or you just know more about the Soemtron companies in general then please let us know, contact us here.
| German manuals for the Soemtron 220 | |
| "Bedienung und Übung" - "Operation and Exercises" by Manfred Sperfeld (1972). | |
| Translated version - 2.2Mb pdf. Translated from a German language publication, ©1972 Manfred Sperfeld of V.E.B. Counting Machines, Potsdam. | |
| "Bedienungsanleitung" - "Operating instructions" by VEB Kombinet Zentronik (1976). | |
| Original German - 3.2Mb pdf. Scanned copy of a 1976 German publication by V.E.B. Kombinet Zentronik. | |
| Russian Technical Manual for the Soemtron 220 | |
| This manual is courtesy of Gerhard Just, and they include a basic description of the logic elements, their component values, operation and even a timing diagram or two. Gerhard has also kindly helped out with some of the translation anomalies. | |
| Original scans - 10Mb pdf, scanned original | Logic diagram - 1.4Mb pdf |
| Translated version - 10.8Mb pdf. This manual has been reproduced from a 1972 Russian publication. | |
| German Logic diagrams for the Soemtron 220 | |
| These drawings are courtesy of Bernard Green, they include component references and values, logic symbols and a diagram for each board and give an insight into the what the logic designers were able to achieve in the functions of the Soemtron ETR 220 with such basic, albeit almost primitive electronics then available in 1960's German Democratic Republic. | |
| Gates | AND - OR Gates |
| Buffers - 1 | Buffers |
| Buffers - 2 | More buffers |
| Delays & Flip-flop inputs | Delays & Flip-flop inputs |
| Basic Flip-flops | Basic Flip-flops |
| Monostables | Monostables |
| Schmitt Trigger | Schmitt Trigger |
| Clock oscillator | Clock oscillator |
| Core driver | Core driver |
| Core sense amplifier | Core sense amplifier |
| Nixie tube drivers | Nixie tube drivers |
| Power supply | Power supply |
| And the boards - | ||
| Board 12 | Cathode drivers and number key encoding | |
| Board 11 | Anode drivers, digit position decoder function keys encoding | |
| Board 10 | Display digit position counter | |
| Board 9 | Memory Register addressing | |
| Board 8 | Negative result latch plus three other undefined | |
| Board 7 | Function latches | |
| Board 6 | Control gating | |
| Board 5 | Function latches, Clock oscillator | |
| Board 4 | "E" register, misc gating and drivers. | |
| Board 3 | "C" register | |
| Board 2 | Core Memory Read, Write and Inhibit drivers | |
| Board 1 | Core Memory and data sense amplifiers | |
| 1 | Download Adobe Acrobat . . . . . . . . . . . . | here | |
| 2 | Group websites . . . . . . . . . . . . . . . . . . . | www.soemtron.org www.soemtron.com www.pdp-7.org www.pdp-7a.org |
back |
| Site design ©2007- Soemtron.org - Privacy - |