On Wed, 8 Nov 2023 09:10:54 -0500, Phil Smith III wrote:
>
>Bob, your musing about communications parameters sounds like full/half duplex.
> 
Mind the difference between half duplex and local echo.  The former used only
a single current loop and pressing a key during output caused garbled output
and perhaps a detected error.  With local echo, keystrokes are transmitted
correctly to the host (possible carrier frequency multiplexing) and the host may
buffer or ignore them.

Stty  reports "echo"/"noecho".

-- 
gil

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