system, but haven't confirmed yet that you take the course, please do so. Extra lectures Computer Architecture, by Stefan Nilsson, Wed. Jan. 20, 13-15h, D31, core , machine . Operating Systems, by Inge Frick, Thu. Jan. 21, 10-12h, D41, pdf . Computer Networks, by Olof Hagsand, Wed. Jan. 27, 13-15h, D41,