Welcome

Who are RISC OS Open Limited?

RISC OS Open Limited (ROOL) manages the source code to RISC OS. We are an organisation run on a largely voluntary basis. We also offer specialist professional services to anyone who is interested in developing products around the Arm architecture or RISC OS. You can find out more information about us here.

What is RISC OS?

RISC OS is a computer operating system designed in Cambridge, England by Acorn. First released in 1987, its origins can be traced back to the original team that developed the Arm microprocessor. RISC OS is owned by RISC OS Developments Ltd. You can find out more at sites such as RISC OS Blog, riscos.info, The Icon Bar and RISCOSitory.

If you are new to RISC OS, you might want to look at the introductory pages in our wiki here.

Latest news

• Raft of new bounties floated (13-Jun-2019)
• Connecting with the 21st century (26-Apr-2019)
• Another bounty gets under way for 2019 (13-Jan-2019)
• Bounty matching target success! (06-Jan-2019)

Recent changes in GitLab

• Pushed to branch master in Kernel (Ben Avison) – Set BEN bit in SCTLR (23-Jun-2019)
• Pushed to branch master in HdrSrc (Ben Avison) – Add a definition of the BEN bit in SCTLR (née MMU control register) (23-Jun-2019)
• Pushed to branch master in BCMVideo (Ben Avison) – Add Raspberry Pi 4 support (23-Jun-2019)
• Pushed to branch master in Wimp (ROOL) – New Wimp_Extend subreason (22-Jun-2019)