IBM spent US $5 billion to build the System/360, introduced in 1964. These 9-track magnetic tape drives were among the S/360’s 150-product line. A short list of the most transformative products of the past century and a half would include the lightbulb, Ford’s Model T—and the IBM System/360. This mainframe series forever changed the computer industry and revolutionized how businesses and governments worked, enhancing productivity and making countless new tasks possible.In the years leading up to...