Contents

 

Figures and Tables

 

7

 

 

 

Preface

About This Developer Note

 

9

 

 

 

 

 

 

 

Contents of This Note

9

 

 

 

 

Supplemental Reference Documents

10

 

PowerPC G3 Microprocessor

10

 

 

Mac OS

10

 

 

 

 

 

 

ATA Devices

10

 

 

 

 

 

USB Devices

11

 

 

 

 

 

Open Firmware

 

11

 

 

 

Chapter 1

Introduction

13

 

 

 

 

 

 

 

 

 

 

 

 

Features

14

 

 

 

 

 

 

Case and External Features

15

 

 

 

Compatibility Issues

18

 

 

 

 

System Software

 

18

 

 

 

 

Main RAM Expansion Modules

 

19

 

Video RAM Expansion Modules

 

19

 

USB Ports and Devices

19

 

 

Chapter 2

Architecture

21

 

 

 

 

 

 

 

 

 

 

 

Processor module

 

23

 

 

 

 

G3 Microprocessor

23

 

 

 

 

Backside Cache

 

23

 

 

 

 

Memory Controller and PCI Bridge

24

 

Main Logic Board

 

24

 

 

 

 

I/O Controller IC

24

 

 

 

 

USB Controller

 

25

 

 

 

 

Video Display Subsystem

25

 

 

 

Built-in Modem

 

25

 

 

 

3

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Apple Desktop Computer manual Contents