Ugg, those were the bad old days for certain. Card decks, I remember making marks at an angle down the tops or bottoms, to help if you ever dropped them. But edits usually rendered those marks nearly useless.
I was very lucky that the first place that actually thought I deserved money for writing computer software, way back when we had a peanut farmer for a president had a Dec-10 computer with terminals you could input your code. The editor was VI-like, I believe named TECO. First big program was to determine the maximum distance between and angle between the Very High Voltage Power Lines coming out of power plants. Just a giant statics problem. Downside was the Fortran only had computed GOTO's, something like IF (A,B) (220, 230, 240) and you go to 220 if A < B, 230 if A = B and 240 if A > B or something like that.
My BS in college is in Electrical Engineering, but the Masters is CS, so I came over to the dark side very early on.