Editing ARX (operating system) (section)

{{Short description|Operating system developed by Acorn Computers Ltd}}
{{Infobox OS
| name                   = ARX
| logo                   = 
| screenshot             = 
| caption                = 
| developer              = [[Acorn Computers]] Ltd.
| family                 = [[Unix-like]]
| working state          = Discontinued
| source model           = 
| released               = 
| latest release version = 
| latest release date    = 
| marketing target       = Low cost paperless office computing [[workstation]]
| programmed in          = [[Modula-2+]]
| language               = English
| update model           = <!-- APT, Windows Update, etc. -->
| package manager        = <!-- dpkg, rpm, Windows installer, etc. -->
| supported platforms    = [[ARM architecture|ARM]]
| kernel type            = [[Microkernel]]
| userland               = 
| ui                     = [[Graphical user interface]]<ref name=AH>{{Cite web
 | title = Acorn History (untitled)
 | access-date = 2010-12-26
 | url = http://www.stairwaytohell.com/articles/AU-AcornHistory.html
}}</ref> and special keyboard keys<ref name=CAAA500>{{Cite web
 | title = Chris's Acorns: Acorn A500 (prototype)
 | access-date = 2022-12-19
 | url = https://chrisacorns.computinghistory.org.uk/Computers/A500.html
}}</ref>
| license                = [[Proprietary software|Proprietary]]
| preceded by            = [[Acorn MOS|MOS]]
| succeeded by           = Arthur, renamed [[RISC OS]]
| website                = 
}}

'''ARX''' was an unreleased [[Mach (kernel)|Mach-like]] [[operating system]] written in [[Modula-2+]]<ref>{{Cite web |last=Bruce |first=Cockburn |title=Aha—what about Modula-2? |url=http://www.chiark.greenend.org.uk/~theom/riscos/docs/Modula2ARX.txt}} Usenet post to comp.sys.acorn detailing the relationship between ARX and Modula-2</ref> developed by [[Acorn Computers]] Ltd in the Acorn Research Centre (ARC) [[United Kingdom]] (UK) and later by [[Olivetti]]—which purchased Acorn—for Acorn's new [[Acorn Archimedes|Archimedes]] personal computers based on the [[ARM architecture]] [[reduced instruction set computer]] (RISC) [[central processing unit]] (CPUs).