Apple Desktop Computer manual X, Y, Z

Page 75

I N D E X

Run-Time Abstraction Services. See RTAS

S

SDRAM device speciﬁcations 50

serial presence detect, on SO-DIMM 50 SGRAM 53

SO-DIMMs, for RAM expansion 48 address multiplexing on 52 conﬁgurations 51

electrical design of 49 electrical limits for 52 JEDEC speciﬁcations 49 mechanical design of 49 SDRAM device speciﬁcations 50

sound

input sources 36 built-in microphone 36

output devices 36 external sound output 37 headphone jacks 37 internal speakers 36

sound speciﬁcations 37 sound system 35–38 speakers 36

StartUp Disk control panel 66 system module 23, 23–24

T

ToolBox Image ﬁle, contents of 62–63 Open Firmware script 62 ToolBox ROM Image 63 Trampoline Code 63

ToolBox ROM Image 63 Trampoline Code 63 Trampoline code 63, 64

U

Universal Serial Bus. See USB USB connectors 28

USB controller IC 25 USB ports 28–31

compatibility 30–31 with ADB 30 with serial ports 31

controller type 31 data transfer speeds 29 transfer types 29

USB with keyboard 33

V, W, X, Y, Z

video display 34

video display controller IC 25 video display subsystem 25 video RAM expansion 53

75

Image 75

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 DevicesE 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