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 professional services to anyone who is interested in developing commercial products using 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 Castle Technology Ltd. You can find out more at sites such as riscos.info, The Icon Bar, My RISC OS and RISCOSitory.

Latest news: Headlines

• RISC OS Open at the Wakefield Show (18-Apr-2012)
• Beeb@30 (20-Mar-2012)
• Do you sell software for RISC OS? (18-Mar-2012)
• RISC OS Open on Facebook (04-Mar-2012)

Recent changes in CVS

• ROOL CVS: Fix crashes on ARM6T2+ when OS_Byte/OS_Word are used from IRQ mode (15-May-2012)
• ROOL CVS: Added the class specific device descriptors to the exported header file. (14-May-2012)
• ROOL CVS: Fixed cache detection code (14-May-2012)
• ROOL CVS: Added definitions for the ARMv6 extensions to the CP15 cache type register (14-May-2012)