The first ARM-based computer was the Acorn Archimedes, a mid-80s computer with 512kB of RAM and no hard drive. The Archimedes ran RISC OS, a very nice graphical operating system written explicitly ...

As The Register described for the 25th anniversary of the Acorn Archimedes way back in 2012, the OS evolved from a version called Arthur, which itself was born from the OS used in Acorn's 6502 ...

It was a brand-new Acorn Archimedes, probably an A300, and it was the first time I had used an operating system with a desktop GUI. The computer was the first consumer application of the ARM ...