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RISC OS One Documents

Guides for RISC OS One, and the RISC OS 5 manuals.

Getting started with RISC OS One

  • Downloads – pick the Frosted ROM for your Raspberry Pi, Iyonix, iMX6 board or Titanium.
  • The Frosted theme ships as a !ThemeDefs package with three wallpapers and !Fonts; merge it with your existing !Boot.
  • The Frosted HardDisc4 image includes PackMan, !PlingStore, ChatCube, StrongED and AcornSSL 1.07.
  • Keep secure browsing working with the latest !CA certificates bundle.

Manuals

  • RISC OS Programmer’s Reference Manual 2026 – the complete RISC OS 5 Programmer’s Reference Manuals, Reader Edition 2026. It gathers 2,538 entries and 24 local supplements from the RISC OS Open documentation wiki, which keeps its original owners’ rights.
  • RISC OS 5.30 User Guide – the complete user guide, Reader Edition 2026: the desktop, the Filer, configuration, printing and the bundled applications. Copyright Acorn Computers Limited 1996, updates copyright RISC OS Open Ltd 2018-2024, published under the Apache Licence 2.0.

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Get RISC OS One

Frosted ROMs for Raspberry Pi, Iyonix, iMX6 and Titanium, plus the HardDisc4 image and the Frosted theme.

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Programmer's Reference

Find the RISC OS 5 Programmer's Reference Manuals and RISC OS One guides in Documents.

RISC OS Technologies

RISC OS One is built and maintained by RISC OS Technologies. About us · Contact

RISC OS IPR

RISC OS is an open source operating system owned by RISC OS Developments Ltd and licensed primarily under the Apache 2.0 licence.

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