Editing Tru64 UNIX (section)

{{Short description|Computer operating system}}
{{Infobox OS
| name = Tru64 UNIX
| logo = Digital-unix-logo.gif
| logo size = 150px
| screenshot =
| caption =
| developer = [[Digital Equipment Corporation|DEC]], [[Hewlett-Packard|HP]], [[IBM]], [[Compaq]]
| family = [[Unix]], [[OSF/1]]
| working_state = Retired (support ended December 2012)<ref>{{cite web |url=http://h30097.www3.hp.com/tru64roadmapjan2011.pdf |archive-url=https://web.archive.org/web/20140224194118/http://h30097.www3.hp.com/tru64roadmapjan2011.pdf |archive-date=2014-02-24 | title=Tru64 Roadmap |date=January 2011}}</ref>
| source_model = [[Closed source]]
| released = {{release date and age|1992|1}}
| latest_release_version = 5.1B-6
| latest_release_date = {{Release date and age|2010|10|01}}
| supported_platforms = [[DEC Alpha]]
| kernel_type = [[Hybrid kernel]]
| userland = [[POSIX]]
| ui = [[Command-line interface]]
| license = [[Proprietary software|Proprietary]]
| website = [http://h30097.www3.hp.com/ Tru64 UNIX Software]
}}
'''Tru64 UNIX''' is a discontinued [[64-bit]] [[UNIX]] [[operating system]] for the [[DEC Alpha|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]], and [[Darwin (operating system)|Darwin]].)

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