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

• Raspberry Pi 3 Model A+ on sale now (15-Nov-2018)
• £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)

Recent changes in CVS

• ROOL CVS: Fix FindOKMode not recovering properly from unsupported VIDC lists (19-Nov-2018)
• ROOL CVS: Fix potential buffer overflow, report error return code (17-Nov-2018)
• ROOL CVS: Suppress compiler warnings (17-Nov-2018)
• ROOL CVS: Add 4k and 64k sprite output options (16-Nov-2018)