My first computer was a TRS-80 MicroColorComputer.
Had to connect it to a tv (didn’t have a monitor).. if I wanted to save whatever I had thrown together from the weekly programming magazine back then, it had to be saved on a cassette tape (I remember it used to take 30 minutes to an hour to save a few kilobytes :p).
Can’t forget the 300 baud cradle modem :p
Acoustic coupler modem, just try to tell the mobile phone gen how that even worked. ;^) Reliance on the fact that almost everyohe had a TV was a brilliant idea home computer makers all followed, even the unsuccessful ones. I'm sure I've still got at least one RF modulator around here, uh, somewhere... I only had the pleasure of using a cassette deck to save and/or load on those Timex 1000's. :^)