Editing RISC iX (section)

{{short description|Discontinued Unix operating system}}
{{Lead too short|date=May 2024}}
{{Use dmy dates|date=November 2016}}
{{Infobox OS
| name = RISC iX
| logo = 
| screenshot = Riscix-A680-1.jpg
| caption = RISC iX running on the Acorn A680
| developer = [[Acorn Computers]] Ltd
| source model = 
| kernel type = 
| supported platforms = [[Acorn Archimedes]]
| ui = [[Graphical user interface]]
| family = [[Unix-like]]
| released = {{Start date and age|1988|df=yes}}
| latest release version = 
| latest release date = 
| marketing target = 
| programmed in = [[C (programming language)|C]], [[ARM architecture|ARM]] [[Assembly language|assembly]]
| language = English
| update model = 
| package_manager = 
| working_state = Discontinued
| license = 
| website = 
}}
'''RISC iX''' is a discontinued [[Unix]] [[operating system]] designed to run on a series of [[workstation]]s based on the [[Acorn Archimedes]] microcomputer.<ref name="riscixug">{{cite book |url=https://www.4corn.co.uk/archive/docs/Acorn%20R140%20RISC%20iX%20User%20Guide-opt.pdf |title=Acorn R140 RISC iX User Guide |publisher=Acorn Computers Limited |date=December 1988 |isbn=1852500581}}</ref> Heavily based on [[Berkeley Software Distribution|4.3BSD]], it was initially completed in 1988, a year after [[Arthur (operating system)|Arthur]] but before [[RISC OS]].<ref name="chris_riscix">{{ cite web | url=http://chrisacorns.computinghistory.org.uk/Riscix.html | title=RISC iX | website=Chris's Acorns | date=2 May 2014 | access-date=23 January 2025 }}</ref> It was introduced in the ARM2-based R140 workstation in 1989,<ref name="acornuser198902">{{cite news |url=https://archive.org/details/AcornUser079-Feb89/page/n8/mode/1up |work=Acorn User |title=Acorn to unveil Unix machine |date=February 1989 |access-date=6 September 2020 |pages=7}}</ref> followed up by the ARM3-based R200-series workstations in 1990.<ref name="acornuser199008">{{cite news |url=https://archive.org/details/AcornUser097-Aug90/page/n8/mode/1up |title=ARM3-based Unix |work=Acorn User |date=August 1990 |access-date=25 October 2020 |pages=7}}</ref>