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: Headlines

• £5,000 of bounty matching goodness (31-Oct-2018)
• RISC OS 5.26 is alive! (26-Oct-2018)
• At last! RISC OS is back on NOOBS (25-Oct-2018)
• RISC OS is open for business! (22-Oct-2018)

Recent changes in CVS

• ROOL CVS: Improve mode substitution logic (07-Nov-2018)
• ROOL CVS: Attempt to tidy up substitute screen mode selection logic (07-Nov-2018)
• ROOL CVS: CVS access rights have now been suspended while the licence to the source code is updated. (22-Oct-2018)
• ROOL CVS: Don’t try setting filetype when the file is open (16-Oct-2018)