On Fri, 3 May 2024, Steve Lewis via cctalk wrote:
There was talk regarding BASIC as an operating system.
Basic as an Operating System vs. An Operating system written in Basic?
The original Acorn Archimedes (First ARM CPU system) had an OS initially
called "Arthur" which was written in BBC Basic and assembler. It supported
a graphical user interface - later re-written in assembler and called
RISC-OS.
https://en.wikipedia.org/wiki/History_of_RISC_OS#Arthur
-Gordon