Interesting -- I wasn't aware of Diamond OS for the Atari 8-bits -- it seems similar in concept to GEOS (which was available for the Commodore 64 and 8-bit Appl

Interesting -- I wasn't aware of Diamond OS for the Atari 8-bits -- it seems similar in concept to GEOS (which was available for the Commodore 64 and 8-bit Apple II series, and later in a much expanded version for x86 PCs) -- basically a GUI environment running on machines where the popular wisdom was that such a thing would be infeasible.