Before spending the summer of 1983 busing tables to save up for a floppy drive, I used audio cassettes to store games on my Apple II+ clone.
Loading a program took many attempts, adjusting the volume each time, even after I started monitoring audio levels it with oscilloscope I got at a garage sale.
I even used an 8-track recorder - those briefly existed - because it stored a better quality signal than my cheap cassette recorder. I had Sublogic Flight Simulator - which later became Microsoft Flight Simulator - on 8-track.
