It was October 9th, 1984, and Steve Jobs was going to a nine-year-old’s birthday party. He’d been invited just a few hours earlier by journalist David Scheff, who was wrapping up a profile of the Apple Computer wunderkind for Playboy . Jobs was far from the highest-profile guest, however. Walter Cronkite, Andy Warhol , Keith Haring , Louise Nevelson , John Cage , and singer-songwriter Harry Nilsson were also in attendance. And Yoko Ono , of course—it was her son’s birthday, after all. Despite the last-minute invitation, Jobs had managed to bring along a gift for the young Sean Lennon. A few hours into the party—once cake had been served and the adults began to talk amongst themselves—Jobs asked Lennon if he was ready to open his present. It was, naturally, a Macintosh computer. Released in January of that year, the machine was the newest of Apple’s personal computing products on the market. Jobs set up the Macintosh on the floor of Lennon’s bed...