Apple Desktop Computer manual Case and External Features, Shows a front view of the computer

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C H A P T E R 1

Introduction

Modem: The computer has a built-in modem with 56 Kbps data rate. For more information, see “Internal Modem” (page 39).

Ethernet: The computer has a built in Ethernet port for a 10Base-T and 100Base-TX operation with an RJ-45 connector. For more information, see “Ethernet Port” (page 39).

Infrared link: The computer has an IrDA infrared link capable of transferring data at up to 4 Mbits per second. For more information, see “Infrared Communication Link” (page 35).

Sound: The computer has a built-in microphone and two stereo speakers as well as line-level stereo input and output jacks and two stereo headphone jacks. For more information, see “Sound System” (page 35).

Keyboard: The Apple USB keyboard is a new design that operates as a USB device. The keyboard includes function keys and inverted-T cursor motion keys. It is also a bus-powered USB hub with two USB ports. For more information, see “Keyboard” (page 32).

Mouse: The Apple USB mouse is a new design that operates as a USB device. For more information, see “Mouse” (page 33).

Size and weight: The iMac computer is 39.5 cm (15.8 inches) high, 38.0 cm (15.2 inches) wide, and 44.0 cm (17.6 inches) deep; it weighs 17.3 kg (38.1 pounds).

Case and External Features

The Apple iMac computer is housed in a two-tone plastic case that includes the display. The separate keyboard and mouse are also designed in two-tone plastic.

The top of the case includes a built-in handle for carrying the computer. The handle can also be used to secure the computer using a cable and lock.

Figure 1-1 shows a front view of the computer.

Case and External Features

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Contents Apple iMac Computer Page Contents RAM Expansion Devices and PortsRtas SoftwareRtas NV-RAM Appendix Abbreviations IndexFigures and Tables Page About This Developer Note Contents of This NoteATA Devices PowerPC G3 MicroprocessorSupplemental Reference Documents Mac OSOpen Firmware USB Devices E F a C E Introduction Features Shows a front view of the computer Case and External FeaturesFront view 2Side view showing I/O bay System Software Compatibility IssuesMain 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 ConnectorsGND Transfer Types SupportedADB Compatibility USB Compatibility IssuesUSB Controller Serial Port CompatibilityMacintosh-To-Macintosh Connections USB Storage DevicesKeyboard Layout KeyboardKeyboard and USB MouseVideo Display Hard Disk DriveSound System Infrared Communication LinkExternal Sound Input Sound InputsSound Outputs Built-in MicrophoneSound 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 coverRAM Expansion Removing the Retaining Screws 3Logic board assembly handle and retaining screwsRemoving the EMI Shield Removing the Logic Board AssemblyLocations of the Expansion Slots 6Locations of the RAM expansion slots Main RAM ExpansionElectrical Design of RAM SO-DIMMs Mechanical Design of RAM SO-DIMMsSdram Devices Configuration of RAM SO-DIMMs Address Multiplexing RAM SO-DIMM Electrical LimitsVideo RAM Expansion Page Software Why Make This Change? What Has Changed Features of the New Approach Data Structures and Files PerformanceRAM Footprint User ExperienceBoot ROM Contents Rtas Mac OS ndrv DriversToolbox Image File Contents NewWorld Boot Process Trampoline CodeToolBox ROM Image Interrupt Handling What Is DifferentRAM Footprint Outmoded ResourcesStartup Disk Control Panel NanoKernelOpen Firmware and the Device Tree Interrupt LayoutMachine Identification Software Abbreviations Chrp NMI Page Index Nvram X, Y, Z Allen Watson