Archimedes Live!Try out the original ARM OS, Arthur, on an emulated Acorn Archimedes A310, running in your browser!
https://archi.medes.live/#preset=a310-arthur&disc=arthur-welcome
Arthur was a precursor to the better-known RISC OS. Its desktop GUI is written in BASIC and was originally intended as a demo to show how a WIMP-style interface might work, but Acorn decided to ship it as part of the Arthur ROM - gaudy colours, bugs and all.
Click the floppy icon to browse the Welcome Disc that came with the Archimedes and try out some of the apps designed to show off the blazing-fast 8Mhz ARM2 RISC CPU.