Oberon has a tortured version history, so it takes a bit to explain what "Project Oberon 2013" is, but it's basically representative of Oberon in a very early stage of development.
This version was originally described by Wirth in his 1992 book "Project Oberon: The Design of an Operating System, a Compiler and a Computer". After his retirement he prepared a new edition, which came to be known as "Project Oberon 2013". For this edition he switched out the "computer" part -- the original used the now extremely obscure NS32000 CPU, the new edition used a custom RISC architecture implemented on an FPGA. But otherwise than this "implementation detail", the system was unchanged.
(And of course, given the FPGA source code, it's easy to build an emulator.)
But if you try this and it feels primitive -- it is. Later versions of Oberon got much fancier.