RISC OS

Jérémie Robert

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.

Named after the Reduced Instruction Set Computer (RISC) architecture, RISC OS was the first operating system for ARM-based computers.

RISC OS is not a version of Linux, nor is it in any way related to Windows. It has a number of unique features and aspects to its design.

https://www.riscosopen.org/content/downloads/raspberry-pi

Installing RISC OS on the Raspberry Pi How to get started with a BeagleBoard A super quick guide to using RISC OS