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Comment by kevin_thibedeau | Hacker News Reader

Tmux doesn't support serial ports.

I'm not sure what made "screen" integrate the two separate pieces of functionality - you can use something minimal like "tio" for serial port access and it's much more elegant.

It isn't separate functionality. Terminals connected via serial port is a valid use case for a terminal multiplexor.

In theory you're correct, but by that logic you'd also have to add ssh (probably by far the most common way of connecting to a remote terminal today). I guess you'd end up with something like mobaXTerm which is a valid approach for sure, but doesn't compose as well.

Personally I live by the maxim "if it can be separated without significant drawbacks, then it should be separate" but GNU tends to see it differently.

I dont think you understand what a terminal is. What you’re talking about is a shell running in a console. What we’re talking about is the terminal to connect to the console serial port running the shell.

EG https://en.m.wikipedia.org/wiki/VT220

It's not separate functionality. The back end (so-called "master" side) of a pseudo-terminal is almost (bar initialization of line speed, hardware flow control, and framing settings) indistinguishable from a "null-modem" call-out serial port or parallel port terminal device. Write a software terminal emulation program for the former, which of course is what screen has, and you already have one for the latter.

What is a serial port and what do you use it for?

It is a port that has two data lines, RX and TX, and data is sent in a serial fashion across those data lines. It is used today for embedded systems, routers and switches et al, and getting a console on any machine that doesn't have a gpu with a monitor attached.

USB is a serial BUS, which allows multiple devices; serial ports are single device (if my memory serves).

When most people use the term "serial port" they're referring to a DB-25 or DE-9 port you find on older computers or USB dongles. It's also seen in 8P8C (aka "RJ45") form sometimes, especially in industrial equipment. It can send and receive "characters" (anywhere from 5-8 bits each) one at a time at a fixed rate, either half duplex or full duplex. They usually implement one or more of the RS232, RS422, or RS485 standards.

Originally, you communicated with the computer using a teletype or video terminal connected to a serial port. Whatever you typed went to the computer, and whatever the computer sent back was printed on your terminal screen (or paper in the case of a teletype).

The UNIX (and thus, Linux) command line environment still works this way, except the serial line is virtual.

console=ttyS0,115200

Just use minicom

I'm sure a rewrite of screen in Rust will be 105% secure. And won't support serial ports either.

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