Apple Desktop Computer manual Devices and Ports, RAM Expansion

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	Infrared Link Module				26
Chapter 3	Devices and Ports				27

	USB Ports	28
	USB Connectors			28
	Transfer Types Supported					29
	USB Compatibility Issues					30
	ADB Compatibility				30
	Serial Port Compatibility					31
	Macintosh-To-Macintosh Connections						31
	USB Storage Devices				31
	USB Controller			31
	Keyboard	32
	Keyboard Layout			32
	Keyboard and USB			33
	Mouse	33
	Hard Disk Drive		34
	Video Display		34
	Infrared Communication Link					35
	Sound System		35
	Sound Inputs		36
	Built-in Microphone				36
	External Sound Input				36
	Sound Outputs		36
	Internal Speakers			36
	External Sound Output					37
	Headphone Jacks			37
	Sound Speciﬁcations			37
	Ethernet Port		39
	Internal Modem		39

Chapter 4 RAM Expansion	41
The Expansion Slots	42

Removing the Logic Board Assembly

42

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Contents Apple iMac Computer Page Contents Devices and Ports RAM ExpansionSoftware RtasAppendix Abbreviations Index Rtas NV-RAMFigures and Tables Page Contents of This Note About This Developer NotePowerPC G3 Microprocessor Supplemental Reference DocumentsMac OS ATA DevicesUSB Devices Open FirmwareE F a C E Introduction Features Case and External Features Shows a front view of the computerFront view 2Side view showing I/O bay Compatibility Issues System SoftwareVideo 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 PortsTransfer Types Supported GNDUSB Compatibility Issues ADB CompatibilitySerial Port Compatibility Macintosh-To-Macintosh ConnectionsUSB Storage Devices USB ControllerKeyboard Keyboard LayoutMouse Keyboard and USBHard Disk Drive Video DisplayInfrared Communication Link Sound SystemSound Inputs Sound OutputsBuilt-in Microphone External Sound InputExternal 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 CablesRAM Expansion 3Logic board assembly handle and retaining screws Removing the Retaining ScrewsRemoving the Logic Board Assembly Removing the EMI ShieldLocations of the Expansion Slots Main RAM Expansion 6Locations of the RAM expansion slotsMechanical Design of RAM SO-DIMMs Electrical Design of RAM SO-DIMMsSdram Devices Conﬁguration of RAM SO-DIMMs RAM SO-DIMM Electrical Limits Address MultiplexingVideo RAM Expansion Page Software Why Make This Change? What Has Changed Features of the New Approach Performance RAM FootprintUser Experience Data Structures and FilesBoot ROM Contents Mac OS ndrv Drivers RtasToolbox Image File Contents Trampoline Code NewWorld Boot ProcessToolBox ROM Image What Is Different Interrupt HandlingOutmoded Resources RAM FootprintNanoKernel Startup Disk Control PanelInterrupt Layout Open Firmware and the Device TreeMachine Identiﬁcation Software Abbreviations Chrp NMI Page Index Nvram X, Y, Z Allen Watson