CYBIS Release

CYBIS (CYber-Based Instructional System) started life as PLATO (Programmed Logic for Automatic Teaching Operations) and was developed at CERL (Computer-based Education Research Laboratory) at the University of Illinois. Later PLATO became a commercial product marketed by CDC. The rights to the PLATO name were sold and CDC rebranded the product CYBIS. Eventually University Online which became VCampus acquired CYBIS from CDC. VCampus is no longer in business and its assets (including CYBIS) now belong to Nat Kannan, its former CEO.

I have been able to secure a copy of CYBIS for Controlfreaks. Paul Koning and I got permission from Nat Kannan to use and share this material under the condition that it won't be resold or used for any commercial purpose whatsoever. This condition applies to the CYBIS software, tools and course content.

With the generous help of Paul Koning I was able to create a "canned" ready-to-run package containing a deadstart tape, disk images, emulator initialization file, Desktop CYBER emulator binaries for various platforms and emulator sources.

A big THANK YOU to Paul Koning and Nat Kannan for making this possible. Thanks also to Gerard van der Grinten for a copy of SES and help with its use to build the CYBIS sources.

For convenience and reference I have also included the PLATO terminal emulator (PTERM) for common platforms I have tested with. I recommended to download the latest version from

Below are the components required to get started:

Additional documents of interest: