Apple Products Evolution

In 1985 a power struggle developed between Jobs and CEO John Sculley, who had been hired two years earlier. The Apple board of directors instructed Sculley to "contain" Jobs and limit his ability to launch expensive forays into untested products. Rather than submit to Sculley's direction, Jobs attempted to oust him from his leadership role at Apple. Sculley found out that Jobs had been attempting to organize a putsch and called a board meeting at which Apple's board of directors sided with Sculley and removed Jobs from his managerial duties. Jobs resigned from Apple and founded NeXT Inc. the same year.
• 1986–1993: Rise and fall
Having learned several painful lessons after introducing the bulky Macintosh Portable in 1989, Apple introduced the PowerBook in 1991. The Macintosh Portable was designed to be just as powerful as a desktop Macintosh, but weighed 7.5 kilograms (17 lb) with a 12-hour battery life. 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.
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.