Conserver is an application that allows multiple users to watch a serial console at the same time. It can log the data, allows users to take write-access of a console (one at a time), and has a variety of bells and whistles to accentuate that basic functionality.
Zonker's Greater Scroll of Console Knowledge provides links to various pages with information regarding serial ports, console servers, and the Conserver application.
YouTube - Terminal Servers on 2024-06-27 by clabretro. How to use a Cisco 2509 router as a terminal server with an octopus cable, and connecting a modem to it's AUX port.
YouTube - Birth of A Dream Machine - The LSI ADM 1 by Tech Time Traveller.
YouTube - How it works (ASR33) by RevK.
By Jerry Walker on YouTube: