RAM Expansion | Apple Desktop Computer guide

C H A P T E R 4

RAM Expansion

Figure 4-2Cables connected to the logic board assembly

44The Expansion Slots

Image 44

Apple Desktop Computer manual RAM Expansion

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 PowerPC G3 Microprocessor Supplemental Reference DocumentsMac OS 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 USB Ports and Devices Main RAM Expansion ModulesVideo RAM Expansion Modules Page Architecture Architecture Backside Cache Processor moduleG3 Microprocessor Controller IC Main Logic BoardMemory Controller and PCI Bridge Built-in Modem USB ControllerVideo Display Subsystem Infrared Link Module Devices and Ports USB Connectors USB Ports Transfer Types Supported GND USB Compatibility Issues ADB Compatibility Serial Port Compatibility Macintosh-To-Macintosh ConnectionsUSB Storage Devices USB Controller Keyboard Keyboard Layout Mouse Keyboard and USB Hard Disk Drive Video Display Infrared Communication Link Sound System Sound Inputs Sound OutputsBuilt-in Microphone External Sound Input Headphone Jacks Sound SpeciﬁcationsExternal Sound Output Total harmonic distortion Ethernet Port Internal ModemPage RAM Expansion Placing the Computer Face Down Removing the Logic Board AssemblyExpansion Slots 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 Performance RAM FootprintUser Experience Data Structures and Files Boot ROM Contents Mac OS ndrv Drivers Rtas Toolbox Image File Contents ToolBox ROM Image NewWorld Boot ProcessTrampoline Code What Is Different Interrupt Handling Outmoded Resources RAM Footprint NanoKernel Startup Disk Control Panel Machine Identiﬁcation Open Firmware and the Device TreeInterrupt Layout Software Abbreviations Chrp NMI Page Index Nvram X, Y, Z Allen Watson