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Power Macintosh G3 Developer Note
Contents
Supplemental Reference Documents
PowerPC Microprocessor
Mac OS
Open Firmware
PCI Cards
ATA Devices
USB Devices
FireWire Interface
Chapter 1
Introduction
Power Macintosh G3 Computer Features
Features of the Enclosure
Front View of the Enclosure
Back View of the Enclosure
Access to the Interior
Optional Features
DVD-ROM and DVD MPEG2 Decode Card
Serial Modem Communications
Compatibility Issues
System Software
DMA Addresses and NewWorld Software
Machine Identification and NewWorld Software
No Graphics Support on MLB
No Built-in AV I/O Connectors
Modem Slot
PCI Expansion Slots
Internal Storage Devices
RAM Expansion
No L2 Cache Expansion
ATA-3 Drives
No SCSI Ports
Line Voltages
Monitor Power
No Video RAM Expansion
No LocalTalk Serial Ports
USB Ports and Devices
Chapter 2
Architecture
Block Diagram and Buses
Main Components
PowerPC G3 Microprocessor
Memory Subsystem
Second-Level Cache
System ROM
System RAM
Core ICs
Grackle Memory Controller and PCI Bridge IC
Paddington I/O Controller IC
Burgundy Sound IC
Cuda IC
Graphics Controller IC
Display Memory
USB Controller
FireWire Link Controller
Optional Internal Modem
Chapter 3
I/O Features
ADB Port
USB Ports
USB Connectors
Transfer Types Supported
USB Compatibility Issues
ADB Compatibility
Serial Port Compatibility
Macintosh-To-Macintosh Connections
USB Storage Devices
USB Controller
Keyboard
Keyboard Layout
Keyboard and USB
Mouse
FireWire Ports
FireWire Connector
Ethernet Port
Internal Modem
Disk Drives
Ultra DMA/33 Hard Disk Drive
Optional Ultra2 SCSI (LVD) Drive
ATAPI CD-ROM Drive
Optional ATAPI Zip Drive
Optional DVD-ROM Drive
Sound System
Sound Outputs
Sound Inputs
Digitizing Sound
Video Monitor Port
Graphics Card
Monitor Connector
Monitor Adapter
Monitor Sense Codes
Display Resolution Modes
Graphics Acceleration Display Modes
Chapter 4
Expansion Features
RAM DIMMs
Mechanical Specifications
Presence Detect EEPROM
RAM Address Multiplexing
SDRAM Devices
PCI Expansion Slots
The Modem Interface
Chapter 5
System Software
The New Approach
What Has Changed
Features of the New Approach
Performance
RAM Footprint
User Experience
Data Structures and Files
Compatibility
Boot ROM Contents
POST Code
Open Firmware
Mac OS
'ndrv'
Drivers
RTAS
Mac OS ROM Image File Contents
Open Firmware Script
Trampoline Code
Mac OS ROM Image
NewWorld Boot Process
What Is Different
Interrupt Handling
Outmoded Resources
RAM Footprint
RTAS
NV-RAM
NanoKernel
Startup Disk Control Panel
Open Firmware and the Device Tree
Open Firmware and Startup Devices
Interrupt Layout
Machine Identification
Appendix A
Conventions and Abbreviations
Typographical Conventions
Abbreviations
\xA9 1998 Apple Computer, Inc. — (Last Updated 5 Jan 99)
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