After Jobs left, Sculley was named president and the company experienced a turnaround in 1986; one journalist wrote "since Sculley joined the company … many things have changed", and that his "strategy has worked". Wozniak credited the Macintosh's initial success to Sculley, saying that he "worked to build a Macintosh market when the Apple II went away". Apple introduced a faster microprocessor and renamed "The Macintosh Office" to "Desktop Publishing." Under the direction of Sculley, who had learned several painful lessons after introducing the bulky Macintosh Portable in 1989, Apple introduced the PowerBook in 1991. The same year, Apple introduced System 7, a major upgrade to the operating system, which added color to the interface and introduced new networking capabilities. It remained the architectural basis for Mac OS until 2001, when the classic Mac OS was replaced by Mac OS X. The success of the PowerBook and other products brought increasing revenue. For some time, it appeared that Apple could do no wrong, introducing fresh new products and generating increasing profits in the process. The magazine "MacAddict" named the period between 1989 and 1991 as the "first golden age" of the Macintosh. Under the leadership of Sculley, Apple's sales multiplied from $982 million in 1983 to $7.9 billion in 1993.