Tru64 UNIX

Tru64 UNIX

Developer	DEC, HP, IBM, Compaq
OS family	Unix, OSF/1
Working state	Retired (support ended December 2012)[1]
Source model	Closed source
Initial release	January 1992; 32 years ago (1992-01)
Latest release	5.1B-6 / October 1, 2010; 13 years ago (2010-10-01)
Platforms	DEC Alpha
Kernel type	Hybrid kernel
Userland	POSIX
Default user interface	Command-line interface
License	Proprietary
Official website	Tru64 UNIX Software

Tru64 UNIX is a discontinued 64-bit UNIX operating system for the Alpha instruction set architecture (ISA), currently owned by Hewlett-Packard (HP). Previously, Tru64 UNIX was a product of Compaq, and before that, Digital Equipment Corporation (DEC), where it was known as Digital UNIX (originally DEC OSF/1 AXP).

As its original name suggests, Tru64 UNIX is based on the OSF/1 operating system. DEC's previous UNIX product was known as Ultrix and was based on BSD.

It is unusual among commercial UNIX implementations, as it is built on top of the Mach kernel developed at Carnegie Mellon University. (Other UNIX and UNIX-like implementations built on top of the Mach kernel are GNU Hurd, NeXTSTEP, MkLinux, macOS and Apple iOS.)

Tru64 UNIX required the SRM boot firmware found on Alpha-based computer systems.