I worked 34 years for Eastman Kodak. For 15 years I worked on Color Photographic Paper Development and spent quite a bit of time with Lined Paper, Colored Pencils, and a Calculator. In the middle eighties, we had to learn to use an IBM Mainframe. They got so slow as everyone got an account. When the first PC's arrived, I was so excited about finding a way to use them to take the work I was doing on the mainframe, Offline.
I started with Dos 2.0 and slowly moved up to Dos 7, OS2, Windows, and also a Mac. In my division, I was spending so much time learning to use a PC and helping others, that my time was split 50/50 between IT and Development work.
In 1991, a full time position was created for me, as the only IT guy in our division. I worked in IT for the rest of my career and retired in 2003.
Very few of the people I supported used Unix machines so I had very little experience with it. Because I was hooked on GUI, I am Command Line Challenged. I am trying to make up for that now, but it is slow going.