Well, I actually remember much of that time myself. About a year or so after that video was made I was learning to program in Fortran on the university's IBM-360 mainframe. (Learning to program was compulsory for anyone studying science, engineering and mathematics and the subject was a part of the math curriculum.)

So I was ready when the early processors, 8080/5, Z80 and 8086 arrived a few years later. In fact I was running both DR's CP/M and Tim Patterson's SCP DOS on an S-100 system around the time Microsoft bought the product and renamed it MSDOS.