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 for RISC OS
From The Free On-line Dictionary of Computing (30 December 2018) :

      (Reduced Instruction Set Computer Operating
     System) The operating system originally developed by Acorn
     Computers for their Archimedes family of personal
     RISC OS replaced the Arthur operating system used on the
     first Archimedeses.
     It is written in ARM assembly code and distributed on
     ROM so it takes up no disk space and takes no time to load.
     It supports cooperative multitasking with memory management
     and includes a graphical user interface or "WIMP".  It is
     written in a highly modular style and makes extensive use of
     vectors so it is easy to modify and extend by loading new
     modules in RAM.  Many system calls (called "SWIs" -
     software interrupts) are available to application programmers
     and some of these are available as user comands via a built-in
     command-line interpreter.  RISC OS also supported outline
     fonts when only bitmap fonts were available on most other
     Following the virtual demise of Acorn, development of RISC OS
     4 was taken over by RISCOS Ltd on 1999-03-05 and released on

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