What are risc os?

RISC OS

RISC OS ( /rɪskoʊˈɛs/) is a series of graphical user interface-based computer operating systems (OSes) designed for ARM architecture systems. It takes its name from the RISC (reduced instruction set computing) architecture supported. The OS was originally developed by Acorn Computers for use with their 1987 range of Archimedes personal computers using the Acorn RISC Machine processors. It comprises a command-line interface and desktop environment with a windowing system.

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Some articles on risc os:

Acorn A7000 - Specifications and Technical Details
... Dimensions, HxWxD 102 x 357 x 283 mm Operating System RISC OS 3.60 (A7000), RISC OS 3.71 (A7000+) ... RISC OS 4 is available as a replacement for the Acorn-implemented versions which came fitted as standard ...
Application Directory - Fixed Contents - The RISC OS !Boot System Directory
... This was exploited in the RISC OS disc structure by having an application directory in the root of the default disc called !Boot ... This file then causes various files to be executed, OS modules loaded, standard icons to be loaded and filetypes defined, and defines a number of standard ... Thus RISC OS's entire boot sequence can be avoided merely by holding Shift ...
RISC IX - Supported Hardware - Machines - R140
... Supplied with RISC OS 2 in ROM, the machine would boot that OS then could either automatically boot RISC iX totally removing RISC OS from memory or continue running RISC OS ... An ordinary A440 with at least 4 MiB RAM and a suitable hard drive could run RISC iX ...
RISC OS - Backward Compatibility
... portability exists with subsequent versions of the OS and hardware ... Successive OS upgrades have raised more serious issues of backward compatibility for desktop applications and games ... The version of the OS for the A9home prevented the running of software without an AIF header (in accordance with Application Note 295) in order to stop "trashing ...
Castle Technology
... of ARM computers and manufactured the Acorn-branded range of desktop computers that run RISC OS ... bought the rights to continue production of the RISC PC and A7000+ computers under the Acorn brand ... Castle Technology laster bought the rights to RISC OS from Pace and released the Iyonix PC, the first desktop computer to use the Intel XScale microarchitecture ...