Soemtron ETR220 Downloads

S#105669 - Downloads

Soemtron logo of unknown origin

This page has downloadable drawings and information for our Soemtron ETR220 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 so a current copy of an Adobe Acrobat[1] reader will be needed.  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 its group websites[2] or the files respective owner.

Soemtron logo

If you have any further historical information, circuits, drawings, photographs, data or manuals about the Soemtron ETR220, 221, 222 and 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.


Part number list - a list of all Soemtron part numbers currently available to us from various documents (35Kb)

3D CAD -
All 3D CAD files have been created using the latest version of IronCAD 3D design software[3].  The files are supplied in native (.ics) and Step (AP214) formats within a zipped file.  They can be viewed with a copy of IronCAD Compose[4]

Daro 11 pin connectors - models for the Daro 11 pin plug and socket connectors. (1.9Mb)
Daro 20 pin connectors - models for the Daro 20 pin plug and socket connectors. (2.5Mb)
Daro 32 pin connectors - models for the Daro 32 pin plug and socket connectors. (2.8Mb)
Test connector shorting link - V7 test connector shorting link for normal operation. (184Kb)

Soemtron ETR220 Circuit and Logic diagrams -

(See the "Snagging list" file for the current list of things to check with our ETR220)
Power supply circuit updated 13/12/2018
Keyboard circuit updated 13/12/2018
Display circuit updated 13/12/2018
Backplane circuit updated 13/12/2018
Display cathode drivers and numeric key encoding circuit
logic
updated
updated
05-06-2013
5-05-2012
Display Anode drivers and function key encoding circuit
logic
updated
updated
5-05-2012
5-05-2012
5 bit address "Z" counter circuit circuit
logic
updated
updated
15-05-2012
6-04-2011
Function F2, F5 & F6 latches, including register addressing circuit
logic
updated
updated
11-05-2012
6-04-2011
F1/3, VER and MZ function latches circuit
logic
updated
updated
11-05-2012
6-04-2011
B1-4, VOR and R function latches circuit
logic
updated
updated
5-05-2012
5-05-2012
Control gating circuit
logic
updated
updated
11-05-2012
6-04-2011
V, SCHREIB, S1 function latches and 25Khz clock circuit
logic
updated
updated
5-05-2012
6-04-2011
Arithmetic unit E Register, Carry latch and digit drives 0/1 circuit
logic
updated
updated
11-05-2012
4-04-2011
Arithmetic unit A Register and digit drives 5-9 circuit
logic
updated
updated
5-05-2012
5-05-2012
Core memory drivers and decoding circuit
logic
updated
updated
28-10-2014
6-04-2011
Core store, read amplifiers and digit drives 2-4 circuit
logic
updated
updated
12-12-2012
12-12-2012
Overall block diagram block updated 6-04-2011

All current circuits for the Soemtron ETR220 (5.3Mb file) circuit updated 13/12/2018
All current logic diagrams for the Soemtron ETR220 (1.6Mb file) logic updated 12-12-2012
Net list for the Soemtron ETR220 circuits (309Kb text file) net list updated 05-06-2013
Current problems with the circuits for the Soemtron ETR220 snag list updated 13-04-2011

1 Download Adobe Acrobat Adobe reader.[top]
2 Group websites www.soemtron.org
www.soemtron.com
www.soemtron.eu
www.soemtron.uk
www.pdp-7.org
www.pdp-7a.org[back] [top]
3 IronCAD IronCAD download. [back] [top]
4 IronCAD Compose Compose download. [back] [top]

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