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Apple Desktop Computer User Manual

Apple Desktop Computer
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Technical Publications
© Apple Computer, Inc. 1998
Developer Note
Apple iMac Computer
Developer Note
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Apple Desktop Computer Specifications

General IconGeneral
BrandApple
ModelDesktop Computer
CategoryDesktop
LanguageEnglish

Summary

Preface and References

About This Developer Note

Details the arrangement of information into five chapters within the developer note.

Supplemental Reference Documents

Lists technotes and web resources for further technical information on various components.

Open Firmware Reference

Details three technotes providing an introduction to Open Firmware on the Macintosh platform.

Introduction to the iMac Computer

Features Overview

Summarizes the key features of the iMac computer, with details provided in later chapters.

Case and External Features

Describes the two-tone plastic case, built-in handle, and external design of the iMac.

Compatibility Issues

Addresses potential compatibility problems with applications and peripheral devices.

Main RAM Expansion Modules

Details requirements for SO-DIMMs used for main RAM expansion, emphasizing SDRAM devices.

Computer Architecture

Processor Module Components

Details the components of the processor module: G3 microprocessor, cache, memory controller, and ROM.

Memory Controller and PCI Bridge

Details the Grackle IC (MPC106) acting as bus bridge and memory controller.

I/O Controller IC (Paddington)

Explains the Paddington IC, an integrated I/O controller and DMA engine.

Video Display Subsystem

Details the graphics controller ASIC, SGRAM, and acceleration capabilities.

Devices and Ports Guide

USB Ports Overview

Details the iMac's two USB ports for connecting keyboards, mice, and other devices.

USB Compatibility Issues

Discusses compatibility challenges between USB and earlier ADB/serial ports.

Keyboard and USB Interface

Describes the USB keyboard's design, bus-powered hub capability, and power button function.

Hard Disk Drive Details

Explains the internal hard disk drive using the extended IDE (ATA) interface.

Sound System Overview

Explains the 16-bit stereo audio circuitry for high-quality sound input and output.

Ethernet Port Details

Describes the built-in 10/100 Mbps Ethernet port and its RJ-45 connector.

RAM Expansion Guide

Accessing Expansion Slots

Explains how to open the computer and remove the logic board assembly to access slots.

Main RAM Expansion Details

Details the iMac's two RAM expansion slots for SO-DIMMs using SDRAM devices.

SDRAM Devices Specifications

Specifies requirements for SDRAM devices: speed, CAS latency, and burst length.

Video RAM Expansion Details

Details expanding video RAM up to 6 MB with SGRAM SO-DIMMs for better color depth.

Software Architecture and Features

Rationale for Software Changes

Explains the shift from monolithic ROM to ROM-in-RAM for flexibility and faster releases.

What Has Changed in Software

Details changes in hardware-specific code, ToolBox ROM image in RAM, and startup process.

New Approach Software Features

Lists features like POST, Open Firmware, RTAS, and drivers in the NewWorld architecture.

Software Compatibility

Confirms ROM-in-RAM approach is compatible with applications and system software.

Boot ROM Contents Overview

Details the Boot ROM's functions: startup, hardware init, device tree, RTAS, and OS control.

Open Firmware Architecture

Describes Open Firmware 3.0 features: block device access, device tree, and interrupt tree.

NewWorld Boot Process Steps

Provides a high-level view of the execution path during a NewWorld computer boot.

Abbreviations Glossary

Standard Units of Measure

Defines standard units of measure used throughout the developer note.

Other Abbreviations Used

Lists abbreviations for technical terms, standards, and components.

Document Index

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