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Digital Unix : ウィキペディア英語版
Tru64 UNIX

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 (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 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, Mac OS X and Apple iOS.)
Tru64 UNIX requires the SRM boot firmware found on Alpha-based computer systems.
== OSF/1 ==

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 Corporation 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. The fact that OSF/1 was one of the first operating systems to use the Mach kernel is cited as support of this assertion. Digital also strongly promoted OSF/1 for real-time applications , 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 API. Back at the time of its proliferation, OSF/1 was the third major flavor of UNIX together with System V and BSD.
DEC's original release of OSF/1 (OSF/1 Release 1.0) was in January 1992 for their line of MIPS-based DECstation workstations, however this was never a fully supported product and was cancelled before the end of the year. DEC ported OSF/1 to their new Alpha AXP platform (as DEC OSF/1 AXP), and this was the first version (Release 1.2) of what is most commonly referred to as OSF/1. DEC OSF/1 AXP Release 1.2 was shipped on March 1993. OSF/1 AXP was a full 64-bit operating system and the native UNIX implementation for the Alpha architecture. From OSF/1 AXP V2.0 onwards, UNIX System V compatibility was also integrated into the system.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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