Apple improved Macintosh computers by introducing models equipped with newly-available processors from the 68k lineup. The Macintosh Classic II and Macintosh LC II, which used a 16 MHz 68030 CPU, were joined in 1991 by the Macintosh Quadra 700 and 900, the first Macs to employ the faster Motorola 68040 processor. In 1994, Apple abandoned Motorola CPUs for the RISC PowerPC architecture developed by the AIM alliance of Apple Computer, IBM, and Motorola. The Power Macintosh line, the first to use the new chips, proved to be highly successful, with over a million PowerPC units sold in nine months
Apple replaced the Macintosh Portable in 1991 with the first of the PowerBook line: the PowerBook 100, a miniaturized Portable; the 16 MHz 68030 PowerBook 140; and the 25 MHz 68030 PowerBook 170. They were the first portable computers with the keyboard behind a palm rest, and with a built-in pointing device (a trackball) in front of the keyboard.The 1993 PowerBook 165c was Apple's first portable computer to feature a color screen, displaying 256 colors with 640 x 400 pixel resolution. The second-generation of PowerBooks, the 68040-equipped 500 series, introduced the trackpad, integrated stereo speakers and built-in Ethernet to the laptop form factor in 1994