Apple PowerBook 520 Technical Information download pdf (Page 16)

CHAPTER 1

Introduction

2 Features

The Macintosh PowerBook 520 and PowerBook 540 computers are the ﬁrst of a new

generation of all-in-one notebook computers featuring the powerful Motorola MC68040

microprocessor, color displays, integrated communications architecture, and other

advanced features. Inside the computer’s contoured case are spaces for two rechargeable

batteries, a new high-speed modem, and a processor-direct slot for expansion cards.

The modular design of these new computers offers new opportunities for developers

to expand beyond traditional add-on products by integrating new devices within the

computer’s case. This modular design also makes it easier to upgrade the system with

newer, faster, low-power microprocessors as they become available.

Features 1

Here is a summary of the major features of the PowerBook 520 and PowerBook 540

computers. Each feature is described more fully later in this note.

■ Microprocessor: Motorola MC68LC040 running at 50/25 MHz or 66/33 MHz.

Note

The MC68LC040 uses two processor clocks: one for the system bus

and another, at twice the speed, for the internal circuits. Thus, an

MC68LC040 with a system bus clock of 33 MHz runs its internal

processor at 66 MHz. ◆

■ Random-access memory (RAM): built-in memory consists of 4 MB of low-power,

self-refreshing dynamic RAM (DRAM).

■ RAM expansion: support for RAM expansion cards of up to 32 MB, for a total of

36 MB of RAM.

■ Read-only memory (ROM): 2 MB.

■ Flat panel display: built-in 640-by-480-pixel LCD with 8-bit capability for 256 colors

or shades of gray. The PowerBook 540 and 540c have active matrix LCDs; the

PowerBook 520 and 520c have advanced passive matrix LCDs. Both types of displays

are backlit by a cold cathode fluorescent lamp (CCFL).

■ Video output: 8-bit color video output circuitry supports 256-color display on all

Apple monitors up to 16 inches in size, 16 shades of gray on the Apple Macintosh

Portrait Display, and 16-color display on Apple multiscan monitors; with appropriate

adapter cables, also supports VGA displays and an 800-by-600-pixel SVGA mode.

■ Floppy disk: one internal 1.4 MB Apple SuperDrive.

■ Hard disk: one internal 2.5-inch SCSI hard disk drive with disk capacity of 240 or 320

MB. See “Configurations” on page 5.

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Apple PowerBook 520 Technical Information Page 16