Architecture | Apple Desktop Computer instruction

C H A P T E R 2

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Architecture

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Apple Desktop Computer manual Architecture

Contents

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