The Cuckoo's Egg by Cliff Stoll does a great (and entertaining) job of showing what the Internet was like early on: https://en.m.wikipedia.org/wiki/The_Cuckoo%

The Cuckoo's Egg by Cliff Stoll does a great (and entertaining) job of showing what the Internet was like early on: https://en.m.wikipedia.org/wiki/The_Cuckoo%27s_Egg https://en.m.wikipedia.org/wiki/The_Cuckoo%27s_Egg Telnet, academic connectivity, military networks, international intrigue and espionage, UC Berkeley hippy/nerd culture -- it's a fun read.