I started punching keypunch cards that some computers could read like the IBM 1620 mainframe and the IBM 360 mainframes then in 1966 when I was going to college at age 18. We communicated with computers basically through these punch cards. We would write programs on the punch cards for the computer to execute or we would give jobs to the computer to do through these punch cards so the computer could execute the programs already installed through other punch cards or magnetic Tape at that time. The results often were put on Magnetic Tape and then printed out in Spreadsheets doing various kinds of work from Scientific to Business then to whatever tasks we needed computers to do then in 1966 when I first started out studying about computers and learning to program them. Many times our assignments as programming students was to write a program then punch it out on a keypunch machine and then run the program on the main frame to see if we had done everything correctly in the program we wrote. I was fascinated by what computers could do then and even more fascinated by what they have learned to do since then here now in 2024. I bought my first home computer in 1978 which was a 4k TRS-80 from Radio shack then for around 800 dollars and about 10 years later I went into Silicon valley to buy my first really serious IBM Clone AT computer and color Epsom printer for around 2500 dollars which ran MS-DOS or (Microsoft disc operating System). I liked MS DOS the best of all the operating systems I have ever used because the User (YOU and I) are removed more with each operating system more and more and are able to do less and less things over time in many ways. But, you would have had to likely study like I did to understand what I'm talking about here because it is sort of a techie point of view that many people who are computers techs agree with me on.
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