  The design of a parallel computing system using several thousands or even up
to a million processors asks for processing units that are simple and thus
small in space, to make as many processing units as possible fit on a single
die.
  The design presented herewith is far from being optimised, it is not meant to
compete with industry performance devices. Its main purpose is to allow for a
prototypical implementation of a dynamic software system as a proof of concept.
