Macintosh PowerBook® 500 Series (code named "Blackbird")

The Macintosh PowerBook® 500 Series computers are a family of portable notebook computers. The PowerBook 500 Series are full-function desktop-replacement portable computers with a number of standard notebook computer features. They use either a Motorola MC68LC040 or a MC68040 processor as the standard processor. These standard processors are upgradable to an optional Motorola MPC603e PowerPC® processor through the exchange of the standard processor daughter card with the PowerPC® PowerBook® Processor Card Upgrade daughter card.