Telco regulations were also why modems used an https://en.wikipedia.org/wiki/Acoustic_coupler instead of being directly connected.
As an aside, the em-dash density of this article is one of the highest I've ever seen.
I love the em dash–and I didn't even notice them in this article.
There's only two in the whole article, what are you smoking?
My first year English teacher would be impressed. The lack of em dash characters in a paper would get you a failing grade back in 1995.