In message 
          The Natural Philosopher  wrote:

> I don't need disk access except to load the code. I may not need network
> access. I don't need logging. I sure don't need systemd. I don't need a
> gui.

> I just want to run one high priority daemon and one lower priority
> demon, with shared memory between them...is there something simpler than
> Linux? More like e.g. DOS?

RISC OS? Or possibly even RISC OS Pico.

https://www.riscosopen.org/content/downloads/raspberry-pi

Good use for an older Pi, as RISC OS doesn't need lots of RAM and is only
a single core OS.

Bryan.

--
RISC OS User Group Of London  -  http://www.rougol.jellybaby.net/
RISC OS London Show           -  http://www.riscoslondonshow.co.uk/

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