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'''RISC OS''' ({{IPAc-en|r|ɪ|s|k|.|oʊ|ˈ|ɛ|s}})<ref name="acorn_developer_news_issue14">{{cite news | url=http://chrisacorns.computinghistory.org.uk/docs/Acorn/DN/Acorn_DevNL14.pdf | title=RISC OS | work=ISV Department news from Acorn | publisher=Acorn Computers Limited | date=May 1989 | issue=14 | access-date=2021-02-14 | pages=2 | quote=It is RISC OS (pronounced risk oh ess, not risk oss) | archive-date=21 May 2021 | archive-url=https://web.archive.org/web/20210521002744/http://chrisacorns.computinghistory.org.uk/docs/Acorn/DN/Acorn_DevNL14.pdf | url-status=live }}</ref> is a computer [[operating system]] originally designed by [[Acorn Computers]] Ltd in [[Cambridge]], England. First released in 1987, it was designed to run on the [[ARM architecture|ARM]] chipset, which Acorn had designed concurrently for use in its new line of [[Acorn Archimedes|Archimedes]] personal computers. RISC OS takes its name from the [[reduced instruction set computer]] (RISC) architecture it supports.
Between 1987 and 1998, RISC OS was included in every ARM-based Acorn computer model, including the Acorn 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]]'s [[Network Computer]] and compatible systems.
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