Supplemental Reference Documents, Mac OS | Apple Desktop Computer

P R E F A C E

Supplemental Reference Documents

For more information about the technologies mentioned in this developer note, you may wish to consult some of the following references.

PowerPC G3 Microprocessor

For more information about the PowerPC 750™ microprocessor used in the iMac computer, developers may wish to refer to the standard reference, PowerPC 740/750 Microprocessor Implementation Deﬁnition Book IV. Information about the PowerPC 750 and other G3 microprocessors is also available on the World Wide Web at

http://www.mot.com/SPS/PowerPC/index.html

Mac OS

For a description of the version of the Mac OS that comes with the new models, developers should refer to the Technote for Mac OS 8.1. The technote is available on the Technote web site at

http://developer.apple.com/technotes/tn/tn1121.html

ATA Devices

For the latest information about the system software for ATA devices such as the IDE drive, see Technote #1098, ATA Device Software Guide Additions and Corrections, available on the world wide web at

http://developer.apple.com/dev/technotes/tn/tn1098.html

The web page for Technote #1098 includes a link to a downloadable copy of ATA Device Software Guide.

The technotes are also available on the reference library issues of the developer CD.

10

Image 10

Apple Desktop Computer manual Supplemental Reference Documents, PowerPC G3 Microprocessor, Mac OS, ATA Devices

Contents

Apple iMac Computer Page Contents Devices and Ports RAM Expansion Software Rtas Appendix Abbreviations Index Rtas NV-RAM Figures and Tables Page Contents of This Note About This Developer Note Mac OS PowerPC G3 MicroprocessorSupplemental Reference Documents ATA Devices USB Devices Open Firmware E F a C E Introduction Features Case and External Features Shows a front view of the computer Front view 2Side view showing I/O bay Compatibility Issues System Software Video RAM Expansion Modules Main RAM Expansion ModulesUSB Ports and Devices Page Architecture Architecture G3 Microprocessor Processor moduleBackside Cache Memory Controller and PCI Bridge Main Logic BoardController IC Video Display Subsystem USB ControllerBuilt-in Modem Infrared Link Module Devices and Ports USB Connectors USB Ports Transfer Types Supported GND USB Compatibility Issues ADB Compatibility USB Storage Devices Serial Port CompatibilityMacintosh-To-Macintosh Connections USB Controller Keyboard Keyboard Layout Mouse Keyboard and USB Hard Disk Drive Video Display Infrared Communication Link Sound System Built-in Microphone Sound InputsSound Outputs External Sound Input External Sound Output Sound SpeciﬁcationsHeadphone Jacks Total harmonic distortion Ethernet Port Internal ModemPage RAM Expansion Expansion Slots Removing the Logic Board AssemblyPlacing the Computer Face Down Removing the bottom cover Unfastening the Cables RAM Expansion 3Logic board assembly handle and retaining screws Removing the Retaining Screws Removing the Logic Board Assembly Removing the EMI Shield Locations of the Expansion Slots Main RAM Expansion 6Locations of the RAM expansion slots Mechanical Design of RAM SO-DIMMs Electrical Design of RAM SO-DIMMs Sdram Devices Conﬁguration of RAM SO-DIMMs RAM SO-DIMM Electrical Limits Address Multiplexing Video RAM Expansion Page Software Why Make This Change? What Has Changed Features of the New Approach User Experience PerformanceRAM Footprint Data Structures and Files Boot ROM Contents Mac OS ndrv Drivers Rtas Toolbox Image File Contents Trampoline Code NewWorld Boot ProcessToolBox ROM Image What Is Different Interrupt Handling Outmoded Resources RAM Footprint NanoKernel Startup Disk Control Panel Interrupt Layout Open Firmware and the Device TreeMachine Identiﬁcation Software Abbreviations Chrp NMI Page Index Nvram X, Y, Z Allen Watson