The content of the course Pro Informatik 4 - Rechnerarchitektur, Betriebssysteme und Kommunikationssysteme was converted to the new CMS format and is now available via the left Menu under the heading Lehre.
It contains all the previous content of the old CMS and additionally the introductory C Programm.
As of now i am not sure if i will make the old resources of previous Pro Informatik 4 - Rechnerarchitektur, Technische Informatik 2 - Rechnerarchitektur, Techni Informatik 3 - Betriebssysteme und Kommunikationssysteme and Algorithmen und Programmieren 2 - Objekt Orientierte Programmierung courses available again. If i find the freetime i will consider it though.
Enjoy!