By the mid-1960s, a trend that would become increasingly pronounced was already apparent: while the expense of building a computer’s hardware was steadily declining, the cost of creating both user and system software was rising. In an extremely bold stroke, IBM took advantage of the trend. They announced, in the mid-sixties, all at one time, an entire family of new computers—the famous 360 line. In the commerce of computers, no single event has had wider significance, except for the invention of the transistor.
