My first computer exposure was in high school (Bronx High School of Science) in the 70’s. They had an IBM 1620, looked like something out of a movie with lights

My first computer exposure was in high school (Bronx High School of Science) in the 70’s. They had an IBM 1620, looked like something out of a movie with lights and switches, and a typewriter-like console. We wrote little programs in Fortran (with the advanced divide feature). I still have the textbook we used somewhere.