RISC OS

E356803

ARM-based operating system graphical operating system operating system

RISC OS is a graphical, ARM-based operating system originally created for Acorn's Archimedes computers, known for its efficiency and distinctive desktop environment.

Try in SPARQL Jump to: Surface forms Disambiguation Statements Elicitation Referenced by

All labels observed (6)

Label	Occurrences
RISC OS canonical	6
RISC OS family	2
RISC OS 2	1
RISC OS 3	1
RISC OS 4	1
RISC OS desktop	1

How this entity was disambiguated

This entity first appeared as the object of triple T3421700 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.

NED1 Entity disambiguation (via context triple) gpt-5-mini-2025-08-07

Target entity: RISC OS
Context triple: [Acorn Computers, operatingSystemDeveloped, RISC OS]

A. AmigaOS
AmigaOS is the native multitasking operating system originally developed for Commodore's Amiga personal computers, known for its advanced graphics and multimedia capabilities for its time.
B. MorphOS
MorphOS is a lightweight, Amiga-compatible operating system designed primarily for PowerPC-based hardware, known for its efficiency and continuation of the classic Amiga computing experience.
C. OS/2
OS/2 is a 32-bit multitasking operating system originally developed by IBM and Microsoft as a successor to MS-DOS, known for its stability and use in business environments in the late 1980s and 1990s.
D. Oberon operating system
The Oberon operating system is a minimalist, modular OS designed by Niklaus Wirth and Jürg Gutknecht to accompany the Oberon programming language and demonstrate principles of simplicity and efficiency in system design.
E. Palm OS
Palm OS is a mobile operating system originally developed by Palm, Inc. for personal digital assistants and early smartphones, known for its touchscreen interface and stylus-based input.
F. None of above. chosen
G. Unsure - the case is ambiguous/there is not enough information to decide.

NED2 Entity disambiguation (via description) gpt-5-mini-2025-08-07

Target entity: RISC OS
Target entity description: RISC OS is a graphical, ARM-based operating system originally created for Acorn's Archimedes computers, known for its efficiency and distinctive desktop environment.

A. AmigaOS
AmigaOS is the native multitasking operating system originally developed for Commodore's Amiga personal computers, known for its advanced graphics and multimedia capabilities for its time.
B. MorphOS
MorphOS is a lightweight, Amiga-compatible operating system designed primarily for PowerPC-based hardware, known for its efficiency and continuation of the classic Amiga computing experience.
C. OS/2
OS/2 is a 32-bit multitasking operating system originally developed by IBM and Microsoft as a successor to MS-DOS, known for its stability and use in business environments in the late 1980s and 1990s.
D. Oberon operating system
The Oberon operating system is a minimalist, modular OS designed by Niklaus Wirth and Jürg Gutknecht to accompany the Oberon programming language and demonstrate principles of simplicity and efficiency in system design.
E. Palm OS
Palm OS is a mobile operating system originally developed by Palm, Inc. for personal digital assistants and early smartphones, known for its touchscreen interface and stylus-based input.
F. None of above. chosen

Statements (60)

Predicate	Object
instanceOf	ARM-based operating system ⓘ graphical operating system ⓘ operating system ⓘ
architecture	ARM ⓘ ARMv3 ⓘ surface form: ARMv2 ARMv3 ⓘ ARMv4 ⓘ ARMv5 architecture ⓘ surface form: ARMv5 ARMv6 architecture family ⓘ surface form: ARMv6 ARMv7-A architecture ⓘ surface form: ARMv7 ARMv8-A ⓘ surface form: ARMv8-A (32-bit mode)
countryOfOrigin	United Kingdom ⓘ
developer	Acorn Computers ⓘ Castle Technology ⓘ RISC OS Open Limited ⓘ RISCOS Ltd ⓘ
fileSystem	hierarchical file system ⓘ
fileSystemFeature	no filename extensions by default ⓘ three-letter filetype metadata ⓘ
hasComponent	Desktop filer ⓘ FileCore ⓘ Font Manager ⓘ Task Manager ⓘ Window Manager ⓘ
initialReleaseYear	1987 ⓘ
kernelType	monolithic kernel ⓘ
license	proprietary ⓘ shared source (RISC OS Open distribution) ⓘ
notableFeature	ROM-based operating system ⓘ cooperative multitasking ⓘ drag-and-drop saving between applications ⓘ font manager with anti-aliased fonts ⓘ high efficiency on low-spec hardware ⓘ icon bar at bottom of screen ⓘ
notableFor	distinctive desktop environment ⓘ use in UK education market in 1990s ⓘ
openSourceStatus	partially open source ⓘ
operatingSystemFamily	RISC OS self-linksurface differs ⓘ surface form: RISC OS family
originallyDevelopedFor	Acorn Archimedes ⓘ
originalName	Arthur ⓘ
predecessor	Arthur ⓘ
programmingLanguage	ARM assembly language ⓘ C ⓘ
supports	ARM code modules ⓘ BBC BASIC ⓘ TCP/IP stack ⓘ networking ⓘ
targetHardware	Acorn A5000 ⓘ surface form: Acorn A-series computers Acorn A7000 ⓘ Acorn Archimedes ⓘ Risc PC ⓘ surface form: Acorn Risc PC BeagleBoard ⓘ Iyonix PC ⓘ Pandaboard ⓘ Raspberry Pi ⓘ Titanium motherboard ⓘ
userInterface	Icon bar desktop ⓘ WIMP desktop ⓘ
website	https://www.riscos.com/ ⓘ https://www.riscosopen.org/ ⓘ

How these facts were elicited

Referenced by (12)

Full triples — surface form annotated when it differs from this entity's canonical label.

Acorn Computers → operatingSystemDeveloped → RISC OS ⓘ

BBC BASIC → usedOn → RISC OS ⓘ

Acorn Archimedes → operatingSystem → RISC OS ⓘ

Acorn Archimedes → guiEnvironment → RISC OS ⓘ

this entity surface form: RISC OS desktop

Risc PC → operatingSystem → RISC OS ⓘ

Risc PC → supportsOperatingSystem → RISC OS ⓘ

this entity surface form: RISC OS 3

Risc PC → supportsOperatingSystem → RISC OS ⓘ

this entity surface form: RISC OS 4

Acorn Archimedes in 1987 → operatingSystem → RISC OS ⓘ

subject surface form: Acorn Archimedes

Arthur → operatingSystemFamily → RISC OS ⓘ

this entity surface form: RISC OS family

Arthur → successor → RISC OS ⓘ

Arthur → replacedBy → RISC OS ⓘ

this entity surface form: RISC OS 2

RISC OS → operatingSystemFamily → RISC OS self-linksurface differs ⓘ