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 riscos.info, The Icon Bar and RISCOSitory. Also take a look at the printed RISC OS magazine, Archive, first published in the same year as the Arm launch.

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

Latest news

• We’re here to guide all RISC OS users (31-Oct-2021)
• London Show gets physical (24-Oct-2021)
• ROOL recognised in annual RISC OS awards (10-Sep-2021)
• Ping! Another one fully cooked (13-Aug-2021)

Recent changes in GitLab

• Pushed to branch master in HdrSrc (Stuart Swales) – Suppress warnings when UAL is in use (27-Nov-2021)
• Pushed to branch master in PlingSystem (ROOL) – 1 new component (24-Nov-2021)
• Pushed to branch master in All (ROOL) – 1 new component (24-Nov-2021)
• Pushed to branch master in VFPSupport (Stuart Swales) – Fix to fp32atan2 in certain special cases (24-Nov-2021)