Editing OSF/1 (section)

== Vendor releases ==
DEC's first release of OSF/1 (OSF/1 Release 1.0) in January 1992 was for its line of [[MIPS architecture|MIPS]]-based [[DECstation]] workstations,<ref>{{cite newsgroup | title = Press Release&nbsp;— OSF/1 | author = Ellen Minter | date = 1992-01-28 | newsgroup = bit.listserv.esl-l | message-id = 9201282310.AA15415@enet-gw.pa.dec.com | url = http://groups.google.com/group/bit.listserv.esl-l/msg/b099f187095ca972?dmode=source&hl=en | access-date = 2007-08-21 | archive-date = 2012-11-02 | archive-url = https://web.archive.org/web/20121102123154/http://groups.google.com/group/bit.listserv.esl-l/msg/b099f187095ca972?dmode=source&hl=en | url-status = live }}</ref> however this was never a fully supported product. DEC ported OSF/1 to their new [[DEC Alpha|Alpha AXP]] platform as DEC OSF/1 AXP Release 1.2, released in March 1993. OSF/1 AXP is a full [[64-bit]] operating system, preserving the kernel architecture based on Mach 2.5 and 4.3BSD components.<ref name="dtj1993winter_chang">{{ cite journal | url=https://archive.org/details/bitsavers_decdtjdtjv_9453190/page/n45/mode/2up | title=High-performance TCP/IP and UDP/IP Networking in DEC OSF/1 for Alpha AXP | journal=Digital Technical Journal | publisher=Digital Equipment Corporation | volume=5 | issue=1 | date=Winter 1993 | access-date=24 January 2024 | first1=Chran-Ham | last1=Chang | first2=Richard | last2=Flower | first3=John | last3=Forecast | first4=Heather | last4=Gray | first5=William R. | last5=Haive | first6=K. K. | last6=Ramakrishnan | first7=Ashok P. | last7=Nadkami | first8=Uttam N. | last8=Shikarpur | first9=Kathleen M. | last9=Wilde | pages=44–61 | quote=DEC OSF/1 operating system version 1.2 for Alpha AXP systems is an implementation of the Open Software Foundation (OSF) OSF/1 version 1.0 and version 1.1 technology. The operating system is a 64-bit kernel architecture based on Carnegie-Mellon University's Mach version 2.5 kernel. Components from 4.3 BSD are included, in addition to UNIX System Laboratories System V interface compatibility. }}</ref> From OSF/1 AXP 2.0 onwards, [[UNIX System V]] compatibility was also integrated into the system, but the architecture remained centred on the Mach 2.5 modular kernel, unlike later OSF versions of the system.<ref name="chang1996">{{ cite tech report | url=https://archive.org/details/nasa_techdoc_19960034349/page/n25/mode/1up | title=UNIX-Based Operating Systems Robustness Evaluation | last1=Chang | first1=Yu-Ming | publisher=University of Illinois at Urbana-Champaign | date=1996 | access-date=26 January 2024 | pages=10 }}</ref> Although OSF/1 2.0 was also developed for DECStation MIPS systems, it was "never officially released or sold".<ref name="dec_osf1_2.0_readme">{{ cite web | url=https://web-docs.gsi.de/~kraemer/COLLECTION/OSF1/X20-8/readme | title=DEC OSF/1 X2.0-8 (Rev. 155) for MIPS | author=Digital Equipment Corporation | date=July 1992 | access-date=22 June 2024 }}</ref> Subsequent releases are named Digital UNIX, and later, [[Tru64 UNIX]].

Upon its acquisition of [[Apollo Computer]] in 1989, [[Hewlett-Packard|HP]] announced plans to introduce OSF/1 on both companies' products by late 1990.<ref name="hpprofessional198907_apollo">{{ cite magazine | url=https://archive.org/details/HP-Professional_Vol._03_No._07_Jul_1989/page/16/mode/1up | title=HP Announces Plans For Apollo Division | magazine=HP Professional | date=July 1989 | access-date=15 April 2024 | volume=3 | issue=7 | pages=16 }}</ref> HP released a port of OSF/1 to the early [[HP 9000]]/700 workstations based on the [[PA-RISC]] 1.1 architecture. This was withdrawn soon afterwards due to lack of software and hardware support compared to competing operating systems, specifically [[HP-UX]].<ref name=openpa>{{cite web|title=OSF/1 on PA-RISC|url=https://www.openpa.net/osf_1_mkpa_pa-risc.html|work=OpenPA.net|access-date=29 December 2022|archive-date=23 July 2011|archive-url=https://web.archive.org/web/20110723233438/http://openpa.net/other.html#hp_osf1|url-status=live}}</ref>

As part of the [[AIM alliance]] and the resulting [[PowerOpen]] specification, [[Apple Inc.|Apple Computer]] intended to base [[A/UX]] 4.0 for its [[PowerPC]]-based [[Mac (computer)|Macintosh]]es upon OSF/1,<ref>{{cite news |first=Cate |last=Corcoran |date=4 November 1991 |title=Apple reveals plans for updated A/UX, PowerOpen Unix development alliance |newspaper=InfoWorld |url=https://books.google.com/books?id=Xz0EAAAAMBAJ&pg=PA1 |pages=1, 115 |access-date=11 February 2019 |archive-date=26 July 2020 |archive-url=https://web.archive.org/web/20200726125525/https://books.google.com/books?id=Xz0EAAAAMBAJ&pg=PA1 |url-status=live }}</ref> but the project was cancelled and PowerOpen deprecated.

IBM used OSF/1 as the basis of the [[IBM AIX#IBM mainframes|AIX/ESA]] operating system for [[IBM System/370|System/370]] and [[IBM System/390|System/390]] mainframes.<ref>{{cite web |url=http://www.findarticles.com/p/articles/mi_m0NEW/is_1992_April_1/ai_12162157 |archive-url=https://web.archive.org/web/20060224133234/http://www.findarticles.com/p/articles/mi_m0NEW/is_1992_April_1/ai_12162157 |archive-date=2006-02-24 |title=IBM announces AIX/ESA mainframe version of Unix |access-date=2008-03-28 | date=1992-04-01 }}</ref>

[[Intel Paragon]] supercomputers used a version of OSF/1 featuring the Mach 3.0 kernel.<ref name="intelparagon199310">{{ cite book | url=https://archive.org/details/bitsavers_intelsupergonXPSXPEBrochureOct93_4860969/page/n3/mode/1up | title=Intel Paragon Supercomputers | publisher=Intel Corporation | date=October 1993 | access-date=26 January 2024 | pages=4 }}</ref>

OSF/1 was also ported by [[Kendall Square Research]] to its proprietary [[microarchitecture]] used in the KSR1 [[supercomputer]].