This paper outlines an OASIS implementation of the Unix
OASIS is an extension of the SIMULA programming language which has been
designed to facilitate the \fIimplementation\fR and \fIsimulation\fR of
modular operating systems. Unix was chosen to test OASIS facilities for
developing modular programs because it is both a conceptually simple and
widely used operating system. The objectives of the new design are to
make the implementation easy to understand, test and modify.