Tru64 UNIX

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Tru64 UNIX is a 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 (formerly 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 common commercial UNIX implementations, as it is built on top of the Mach kernel developed at Carnegie Mellon University. (Other UNIX implementations built on top of the Mach kernel are NeXTSTEP, MkLinux, and Mac OS X.)

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



In 1988, during the so-called "Unix wars", DEC joined with IBM, Hewlett-Packard, and others to form the Open Software Foundation (OSF) to develop a version of Unix. Dubbed OSF/1, the aim was to compete with System V Release 4 from AT&T and Sun Microsystems, and it has been argued that a primary goal was for the operating system to be free of AT&T intellectual property.[1] The fact that OSF/1 was one of the first operating systems to use the Mach kernel is cited as support of this assertion[citation needed]. Digital also strongly promoted OSF/1 for real-time applications[citation needed], and with traditional UNIX implementations at the time providing poor real-time support at best, the real-time and multi-threading support was heavily dependent on the Mach kernel. It also incorporated a large part of the BSD kernel (based on the 4.3-Reno release) to provide Unix compatibility. OSF/1 was envisaged to be the third major branch of the Unix family tree, after System V and BSD.

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