I wrote tons of assembly and C, burned EPROMs, wrote documentation (nroff, natch), visited technical bookstores every week or two to see what was new (I still miss the Computer Literacy bookstore). You got printouts from a 133 column lineprinter, just like college. Some divisions had email, corporation-wide email was not yet a thing.
No source code control (the one we had at Atari was called "Mike", or you handed your floppy disk of source code to "Rob" if "Mike" was on vacation). Networking was your serial connection to the Vax down in the machine room (it had an autodial modem, usually pegged for usenet traffic and mail).
No multi-monitor systems, frankly anything bigger than 80x25 and you were dreaming. You used Emacs if you were lucky, EDT if you weren't. The I/O system on your computer was a 5Mhz or 10Mhz bus, if you were one of those fortunate enough to have a personal hard drive. People still smoked inside buildings (ugh).
It got better. AppleTalk wasn't too bad (unless you broke the ring, in which case you were buying your group lunch that day). Laserprinters became common. Source control systems started to become usable. ANSI C and CFront happened, and we had compilers with more than 30 characters of significance in identifiers.
I've built a few nostalgia machines, old PDP-11s and such, and can't spend more than an hour or so in those old environments. I can't imagine writing code under those conditions again, we have it good today.