On Sun, 28 Jun 2020 10:56:25 -0600
Grant Taylor  wrote:

> Ethernet can easily be point-to-multipoint supporting more than two
> computers.  RS-232 can't do that.  (Yes, other serial specifications
> can, but they aren't on the Pi.)

 Of course it can, each link is point to point but nothing restricts
a computer to a single serial port. Way back we used to use Altos Micnet to
create a LAN based on UUCP over whatever topology of serial connections you
cared to make. These days PPP would be a much better option.

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