%T Beyond transputing : fully distributed semantics in Virtuoso\[rs]s Virtual Single Processor programming model and it\[rs]s implementation on of\-the\-shelf parallel DSPs.
%A Eric Verhulst
%E André W. P. Bakkers
%B Proceedings of WoTUG\-20: Parallel Programming and Java
%X Virtuoso Classico /VSP is a fully distributed real\-time
operating system originally developed on the INMOS
transputer. Its generic architecture is based on a small but
very fast nanokernel and a portable preemptive microkernel.
It was further on ported in single and virtual single
processor implementations to a wide range of processors. As
the basis of any real\-time application is a scheduler that
allows the developer to use the minimum schedule to satisfy
the real\-time requirements, a number of derived Virtuoso
tools have been developed with complementary
functionalities. This paper describes the rationale for
developing the distributed semantics of Virtuoso\[rs]s
microkernel and describes some of the implementation issues.
The analysis is based on the parallel DSP implementations as
these push the performance limits most for hard real\-time
applications. The Virtuoso tools are being ported and
further developed in the DIPSAP\-II and EURICO OMI/Esprit
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