FreeDOS

30 years later, FreeDOS is still keeping the dream of the command
prompt alive

Project's creator talks to Ars about where FreeDOS has been, where
it's going.
...
...
While it's not really usable as a standalone modern operating system
in the Internet age--among other things, DOS is not really innately
aware of "the Internet" as a concept--FreeDOS still has an important
place in today's computing firmament. It's there for people who need
to run legacy applications on modern systems, whether it's running
inside of a virtual machine or directly on the hardware; it's also the
best way to get an actively maintained DOS offshoot running on legacy
hardware going as far back as the original IBM PC and its Intel 8088
CPU.

https://arstechnica.com/gadgets/2024/06/30-years-later-freedos-is-still-keeping-the-dream-of-the-command-prompt-alive/