DEC OSF-1 (1991) 0 Unix

DEC OSF-1 was a version of UNIX from DEC built on the Mach kernel. It was first developed for MIPS based DECStations, and then ported to 64-bit DEC Alpha (AXP). It was later renamed to Digital Unix, and then again to True64 Unix.

• 1.x
• 2.x

Digital UNIX (1995) 24 Unix

Formerly OSF/1, in 1994 after the Open Software Foundation (run by DEC, IBM, and HP) ceased involvement, Digital Equipment Corporation renamed the OS to "Digital UNIX". In 1998, DEC was bought out by Compaq and the product was again renamed, to Tru64 UNIX.

• 3.2B
• 4.0B
• 4.0E