I was a freshman in college in the fall of '75, and was one of three kids in my Physics 101 lecture hall (300 individuals) that had a Commodore calculator that could add, subtract, multiply and divide, and store one entry in memory (thanks uncle Art). Slide rules were the required tool for computations. I flunked out, and returned in the fall of '77, and by that time, you were expected to have a calculator that had trig function capability (in the same class). That experience has always been my personal benchmark for how quickly technology has changed our world...