ARX was a
Xerox-like
operating system developed by
Acorn computers in the
UK and at the Acorn Research Centre (ARC) at
Palo Alto for their new
ARM RISC processors. It was a pre-emptive
multitasking,
multithreading, multi-user operating system. It was not finished in time to be fitted to the
Archimedes range of computers, which shipped in
1987 with the
Arthur operating system, which was later superseded by
RISC OS.
ARC was later bought out by
Olivetti[?].