The hierarchical hypermedia world of Hyper-G.

Hermann Maurer, then a professor at the Graz University of Technology in Austria, had been interested in early computer-based information systems for some time, pioneering work on early graphic terminals instead of the pure text ones commonly in use. One of these was the MUPID series, a range of Z80-based systems first introduced in 1981 ostensibly for the West German videotex service Bildschirmtext but also standalone home computers in their own right.