20-sim is developed, owned and distirbuted by Controllab. This pages describes the birth and growth of the software.
Technical University of Twente SIMulation (TUTSIM)
The dynamic modeling and simulation software Tutsim has been developed at the University of Twente, but was sold in the late 70's. During the eigthties some developments were done to port Tutsim from MS-Dos to Windows 2.0. After that the no updates were made anymore.
Computer-Aided Modeling Analysis and Simulation (CAMAS)
In the meanwhile at the University of Twente a new program was developed as part of the the Ph.D. project of Jan Broenink. The program was equiped with a graphical user interface and allowed the creation of models by bond graphs. The prototype name for this modeling and simulation package was CAMAS.
Modeling and Analysis eXpert system (MAX)
While CAMAS was all built around bond graphs, a new prototype package called MAX was built at the University of Twente to investigated object oriented modeling techniques and modeling by iconic diagrams. MAX was the result of the Ph.D. project of Theo de Vries, Arno Breunese and Johannes van Dijk (all supervised by Job van Amerongen and Peter Breedveld).
After extensive testing, in august 1995 version 1.0 of CAMAS has been commercially released under the trade name 20-sim (Twente Sim). The trade name refers to the origin (University of Twente) of the package and the region (Twente) were it was made. The company Controllab Products was established to further develop and distribute the pakage.
It took some time to incorporate the object-oriented modeling approach of MAX into 20-sim. In version 3.0 this was done. Version 3.1 supported the iconic diagrams that were investigated with MAX. New toolboxes were incorporated in subsequent versions of the package.
The release of Windows Vista was used to give the package a major overhaul. Continuous improvements followed.
The release of 20-sim 4.3 was used to give Controllab a new corporate identity. This was reflected in the new logos of 20-sim and 20-sim 4C.