[PostOnce]

I want to chime in on SymbOS, which I think is the perfect reply to the GP's curiosity.

https://www.symbos.org/shots.htm

This is what slow computers with a few hundred kB of RAM can do.

[nxobject]

The original Macintosh had similar specs as well – 128k with a 68k clocked at ~6-7 MHz. It helps that both platforms put a significant amount of OS code in ROM.