Fwiw, ETH Zurich (where Oberon was developed) ships emulated versions of the Project Oberon operating system that can run under various modern platforms: http://www.oberon.ethz.ch/

Wirth and his collaborator Jürg Gutknecht also wrote a book about the project: http://www.amazon.com/gp/product/0201544288/ref=as_li_ss_tl?...