220 Downloads
S#106669
Soemtron 220 Downloads
S#105669 - Downloads
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This page has downloadable drawings and information for our Soemtron ETR 220 electronic calculator serial number 105669. Updates and corrections to the drawings 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 which you can download here. 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 a pdf viewer installed !.
All files on this website are ©2007- www.soemtron.org, group websites or the files respective owners.
If you know of, or have any more history or information about the Soemtron brand, the 220 222 224 or the very rare 221 machine, test equipment (Prüfgeräte) or you just know more about the Soemtron companies in general then please let us know, contact us here.
| Soemtron 220 Circuit and Logic diagrams - | |||
| (See the "Snagging list" file for the current list of things to check with our ETR 220) | |||
| Power supply | circuit | updated | 16/Sept/2011 |
| Keyboard | circuit | updated | 6/Apr/2011 |
| Display | circuit | updated | 6/Apr/2011 |
| Backplane | circuit | updated | 6/Apr/2011 |
| Display cathode drivers and numeric key encoding | circuit logic |
updated updated |
5/May/2012 5/May/2012 |
| Display Anode drivers and function key encoding | circuit logic |
updated updated |
5/May/2012 5/May/2012 |
| 5 bit display "Z" counter circuit | circuit logic |
updated updated |
15/May/2012 6/Apr/2011 |
| Function F2, F5 & F6 latches, including register addressing | circuit logic |
updated updated |
11/May/2012 6/Apr/2011 |
| F1/3, VER and MZ function latches | circuit logic |
updated updated |
11/May/2012 6/Apr/2011 |
| B1-4, VOR and R function latches | circuit logic |
updated updated |
5/May/2012 5/May/2012 |
| Control gating | circuit logic |
updated updated |
11/May/2012 6/Apr/2011 |
| V, SCHRIEB, S1 function latches and 25Khz clock | circuit logic |
updated updated |
5/May/2012 6/Apr/2011 |
| Arithmetic unit E Register, Carry latch and digit drives 0/1 | circuit logic |
updated updated |
11/May/2012 4/Apr/2011 |
| Arithmetic unit A Register and digit drives 5-9 | circuit logic |
updated updated |
5/May/2012 5/May/2012 |
| Core memory drivers and decoding | circuit logic |
updated updated |
11/May/2012 6/Apr/2011 |
| Core store, read amplifiers and digit drives 2-4 | circuit logic |
updated updated |
5/May/2012 6/Apr/2011 |
| Overall block diagram | block | updated | 6/Apr/2011 |
| All current circuits for the Soemtron 220 (5.3Mb file) | circuit | updated | 15/May/2012 | |
| All current logic diagrams for the Soemtron 220 (1.6Mb file) | logic | updated | 15/May/2012 | |
| Net list for the Soemtron 220 circuits (309Kb text file) | net list | updated | 6/Apr/2011 | |
| Current problems with the circuits for the Soemtron 220 | snagging list | updated | 13/Apr/2011 | |
| 1 | Group websites | www.soemtron.org www.soemtron.com www.pdp-7.org www.pdp-7a.org |
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