riscos.com: Riscos Ltd
ISC OS developers - the world's first 32-bit RISC operating system - used in Acorn, Advantage Six, Microdigital and RiscStation computers.
riscos.org: Riscos : Find Out More
RISC OS is the superbly efficient operating system designed in the 1980's by Acorn Computers, and its latest incarnation is used by thousands of people around the world.
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