Main RAM Expansion | Apple Desktop Computer specs

C H A P T E R 4

RAM Expansion

Figure 4-6Locations of the RAM expansion slots

Video RAM slot

Main RAM top slot

Main RAM bottom slot

Main RAM Expansion

The iMac computer has two RAM expansion slots that accommodate standard SO (small outline) DIMMs using SDRAM devices.

IMPORTANT

RAM expansion SO-DIMMs for the iMac must use SDRAM devices. If the user installs an SO-DIMM that uses EDO or SGRAM devices, the computer will beep several times when the user attempts to restart the computer. ▲

An SO-DIMM for the iMac can contain either 16, 32, or 64 MB of memory.

48Main RAM Expansion

Image 48

Apple Desktop Computer manual Main RAM Expansion, 6Locations of the RAM expansion slots

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 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 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 Sound Speciﬁcations External Sound OutputHeadphone Jacks Total harmonic distortion Ethernet Port Internal ModemPage RAM Expansion Removing the Logic Board Assembly Expansion SlotsPlacing the Computer Face Down 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 NewWorld Boot Process Trampoline CodeToolBox ROM Image What Is Different Interrupt Handling Outmoded Resources RAM Footprint NanoKernel Startup Disk Control Panel Open Firmware and the Device Tree Interrupt LayoutMachine Identiﬁcation Software Abbreviations Chrp NMI Page Index Nvram X, Y, Z Allen Watson