Author here.

So the article begins with a story where a character, who doesn't know what he's talking about, try to mentor one of his colleague. It might be awkward though, and difficult to understand; sorry for that.

For sure this article was written better by others, but to me they were also lacking some stuff. I never found an article summarizing the whole story; most of the other sources were brushing away too much information for me to understand really why the TTY device had this weird structure.

But I guess not everybody will agree... and that's fine :)