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Added note on on how RISC OS is incompatible with the Raspberry Pi 5 to the lede, as stated further on in the article in order to be more specific and avoid potential confusion about compatibility. Also changes "Raspberry Pi computer" to "Raspberry Pi series of computers" in order to more accurately reflect their nature. |
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RISC OS is a [[Modular programming|modular]] operating system and takes its name from the [[reduced instruction set computer]] (RISC) architecture it supports. It incorporates a [[graphical user interface]] and a [[windowing system]]. Between 1987 and 1998, RISC OS shipped with every ARM-based Acorn computer including the Archimedes line, Acorn's R line (with [[RISC iX]] as a dual-boot option), [[RiscPC]], [[Acorn A7000|A7000]], and prototype models such as the Acorn [[Acorn Computers#NewsPad|NewsPad]] and [[Phoebe (computer)|Phoebe computer]]. A version of the OS, named [[NCOS]], was used in [[Oracle Corporation|Oracle]]'s [[Network Computer]] and compatible systems.
After the break-up of Acorn, development of the OS was [[Fork (software development)|fork]]ed and continued separately by several companies, including {{nowrap|[[RISCOS Ltd]]}}, [[Pace Micro Technology]], [[Castle Technology]], and RISC OS Developments.<ref name="riscosdev" /> Since then, it has been bundled with several ARM-based desktop computers such as the [[Iyonix PC]]<ref name="Acorn press release 1998-10-12">{{cite press release|publisher=Acorn Computers Ltd |title=Acorn announces distribution deal with Castle Technology for RISC based products |date=12 October 1998 |url=http://www.acorn.co.uk/acorn/news/press/castle.html |access-date=2011-01-06 |quote=(October 12th 1998), Cambridge, UK-Acorn announced today that it has completed negotiations with Castle Technology for them to distribute Acorn products. |archive-url=https://web.archive.org/web/19990506180305/http://www.acorn.co.uk/acorn/news/press/castle.html |archive-date=6 May 1999}}</ref> and [[A9home]]. Most recent stable versions run on the ARMv3/ARMv4 [[RiscPC]], the ARMv5 [[Iyonix PC|Iyonix]],<ref name="Iyonix at a glance RO5 features">{{cite web |url=http://www.iyonix.com/iyonix/features/osfeatures.shtml |title=RISC OS 5 features |access-date=2011-01-31 |publisher=Iyonix Ltd |quote=All IYONIX pcs ship with RISC OS 5 in flash ROM. |url-status = dead |archive-url=https://web.archive.org/web/20101110111706/http://www.iyonix.com/iyonix/features/osfeatures.shtml |archive-date=10 November 2010}}</ref> [[ARMv7]] [[Cortex-A8]] processors<ref name="theinquirer snaps leak">{{cite web |url=http://www.theinquirer.net/inquirer/news/1051924/snaps-leak-risc-os5-beagleboard |archive-url=https://web.archive.org/web/20090519184833/http://www.theinquirer.net/inquirer/news/1051924/snaps-leak-risc-os5-beagleboard |url-status=unfit |archive-date=19 May 2009 |title=Snaps leak of RISC OS5 on BeagleBoard |publisher=[[The Inquirer]] |date=27 April 2009 |access-date=2011-06-28 |last=Farrell |first=Nick |quote=A snap of an RISC OS 5, running on a BeagleBoard device powered by a 600MHz ARM Cortex-A8 processor with a built-in graphics chip, has tipped up on the world wide wibble. The port developed by Jeffrey Lee is a breakthrough for the shared-source project because it has ported the OS without an army of engineers.}}</ref><ref name="RISC OS Open wiki Cortex-A8 port status">{{cite web |url=https://www.riscosopen.org/wiki/documentation/pages/Cortex-A8+port+status/versions/1 |title=Cortex-A8 port status |access-date=2011-01-31 |publisher=[[RISC OS Open]] |quote=[The port includes] a modified version of the RISC OS kernel containing support for (all) Cortex-A8 CPU cores. |archive-date=26 October 2021 |archive-url=https://web.archive.org/web/20211026212426/https://www.riscosopen.org/hub/account/login |url-status=live }}</ref>{{Efn|(such as that used in the [[BeagleBoard]] and [[Touch Book]])}} and [[Cortex-A9]] processors<ref name="ROOL news 2015-04-25">{{cite web |url =https://www.riscosopen.org/news/articles/2015/04/25/risc-os-5-22-stable-is-now-available |title=RISC OS 5.22 stable is now available |access-date=2015-04-25 |last=Revill |first=Steve |date=25 April 2015 |publisher=[[RISC OS Open]]}}</ref>{{Efn|(such as that used in the [[PandaBoard]])}} and the low-cost educational [[Raspberry Pi]]
== History ==
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