System/390 is a series of IBM mainframe models. Successor to the System/370s, and more specifically the System 370/ESAs[?]. Rebranded as zSeries.
... (United Kingdom) 1974 - Ronnie Peterson[?], (Sweden) 1975 - Niki Lauda, (Austria) 1976 - Niki Lauda, (Austria) 1977 - Jody Scheckter, (South Africa) 1978 - Patrick ...