  INAF Trieste Astronomical Observatory (OATs) has a long tradition in
information technology applied to Astronomical and Astrophysical use cases,
particularly for what regards computing for data reduction, analysis and
simulations; data and archives management; space missions data processing;
design and software development for ground-based instruments. The ensemble of
these activities, in the last years, pushed the need to acquire new computing
resources and technologies and to deep competences in theirs management. In
this paper we describe INAF-OATs computing centre technological stuff, our
involvement in different EU Projects both in the path of building of EOSC, the
European Open Science Cloud; in the design and prototyping of new Exascale
supercomputers in Europe and the main research activities carried on using our
computing centre.
