| Developer | Acorn Computers Ltd. |
|---|---|
| Written in | Modula-2+ |
| OS family | Unix-like |
| Working state | Discontinued |
| Marketing target | Low cost paperless office computing workstation |
| Available in | English |
| Platforms | ARM |
| Kernel type | Microkernel |
| Default user interface | Graphical user interface[1] and special keyboard keys[2] |
| License | Proprietary |
| Preceded by | MOS |
| Succeeded by | Arthur, renamed RISC OS |
ARX was an unreleased Mach-like operating system written in Modula-2+[3] 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 Archimedes personal computers based on the ARM architecture reduced instruction set computer (RISC) central processing unit (CPUs).