From the Computarium Crew back
ASSELBORN, Jean-Claude (+ 2011) Konrad ZUSE et l'invention de l'ordinateur

ZUSE et la racine carrée

(Zuse and the computing of the square root)
Powerpoint presentation for the Computarium, Diekirch, 26 Oct. 2010. In French.

Supplementary part showing the solution of the square root by Zuse.
L'art du secret: Part 1, Part 2, Part 3 (unfinished) 3 first parts of a 5 part lecture series prepared by  Jean-Claude Asselborn. These conferences could not be held due to his illness. 
Powerpoint. Mixed French and English.
BAUMANN, Claude Communication with SD cards Lab report (24 pages, version 1.0, 13 Feb 2023) how to read and write an SD card from a PIC-type microcontroller or a Raspberry Pico (with microPython). Uses PICLab and Labview. This is heavy stuff!
BAUMANN, Claude A simple and fast look-up table method to compute the exp(x) and ln(x) functions Paper (14 pages) written in 2004; downloaded as PDF from EBIN (original link) after online conversion to PDF. This new algorithm was developed to be used in programming the LEGO RCX controller using Robolab. It uses a lookup table to make fast calculations of ln(x) and exp(x) compatible with the IEEE754 single precision standard. This is heavy mathematical stuff!
BAUMANN, Claude Das Kalman Filter wird 50 Article in the Luxemburger Wort (18 March 2010); co-author Francis Massen. 
PDF. In German
BAUMANN, Claude EUREKA! Problem Solving with LEGO Robotics (2013) 500 page book written by Claude Baumann and published by NTS (National Technology and Science Press) in 2013. ISBN 978-1934891-13-1.
Click for a view of the cover and back


(co-authors Chris ROGERS, Francis MASSEN)



Dynamic binaural sound localization based on variations of interaural time delays and system rotations

(JASA, 138 (2), Aug. 2015)

Claude Baumann, a Computarium crew member, has published an outstanding paper in JASA, the Journal of the Acoustical Society of America. The co-authors are Chris Rogers (Tuft University, USA) and Francis Massen (Computarium).
The paper gives new insights on how to locate a sound source in space, using calculations performed on the interaural delay-time. The PDF is here

[Copyright 2015 Acoustical Society of America. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the Acoustical Society of America. The following article appeared in JASA, vol. 138 (2), August 2015 and may be found at DOI: 10.1121/1.4923448 ]


BAUMANN, Claude Bringing back to life a COLINBUS Profiler CNC_Router

29 Mar 2021
A very extensive 62-pages report of the restoration of a Colinbus CNC profiler, an heritage of our late member Jean Mootz.

This is as a major research project by Computarium member Claude Baumann and also an original endeavor to combine modern stepper motor drivers, Arduino and self- developed electronic interface to revive a dead machine (which many would have thought being unsalvageable) which was sold in 2009 by the Elektor magazine as a kit.
The report contains a lot of physics and maths, as the author dwelled deep into into the problems of speed, acceleration, torque and other forces.

46 pictures or schemata.



(co-author Francis MASSEN)

Lab report of the TTY converter (version 1.1, 02 November 2022)) A very extensive, complete and long report on the design, creation and programming of the TTY/USB converter for communicating between a vintage ASR-32 TELEX and a PC. This is heavy PIC and Labview stuff!
BAUMANN Claude Lab report on the PIC signal generator (version 1.0, 05 December 2022) A report on the construction of a very small battery-powered signal generator, to be used in a demo of the HP16500A logic analyzer.
MASSEN, Francis Analog Computers (.ppt)  (pdf version)


Handling Vintage Media  (11-Dec-2021)

Conference at the LCD held the 28th April 2017. Link to the Powerpoint presentation covering mechanical and electronic analog computers and calculators. Click here for the flyer.

This is the updated version of the original paper from 2013. It contains now two chapters: how to handle ATARI diskettes, and how to use Motorola EXORset30 XDOS disks

Francis Massen
last edited: 13 Feb 2023