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CHAPTER 4

RAM Expansion

48 Main RAM Expansion

Figure 4-6 Locations of the RAM expansion slots

Main RAM Expansion 4

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.

Video RAM slot

Main RAM top slot

Main RAM bottom slot

1 2 ... 43 44 45 46 47 48 49 50 51 52 53 ... 75 76

Apple iMac Computer 1
Contents 3
Devices and Ports 4
RAM Expansion 4
Software 5
Abbreviations 6
Figures and Tables 7
About This Developer Note 9
USB Devices 0 11
Open Firmware 0 11
Introduction 1 13
Features 1 14
Case and External Features 1 15
CHAPTER 1 17
Compatibility Issues 1 18
Compatibility Issues 19
Introduction 19
Architecture 2 21
CHAPTER 2 22
Processor module 2 23
Main Logic Board 2 24
USB Controller 2 25
Video Display Subsystem 2 25
Built-in Modem 2 25
Infrared Link Module 2 26
Devices and Ports 3 27
USB Ports 3 28
Transfer Types Supported 3 29
USB Compatibility Issues 3 30
Serial Port Compatibility 3 31
USB Storage Devices 3 31
USB Controller 3 31
Keyboard 3 32
Keyboard and USB 3 33
Hard Disk Drive 3 34
Video Display 3 34
Sound System 3 35
Sound Inputs 3 36
Sound Outputs 3 36
Sound Speciﬁcations 3 37
CHAPTER 3 38
Ethernet Port 3 39
Internal Modem 3 39
RAM Expansion 4 41
The Expansion Slots 4 42
Removing the bottom cover 4 43
Unfastening the Cables 4 43
44 The Expansion Slots 44
The Expansion Slots 45 45
Removing the EMI Shield 4 46
The Expansion Slots 47 47
Figure 4-5 EMI shield 47
Main RAM Expansion 4 48
Main RAM Expansion 49 49
SDRAM Devices 4 50
CHAPTER 4 51
Address Multiplexing 4 52
Video RAM Expansion 4 53
Software 5 55
Why Make This Change? 5 56
What Has Changed 5 57
Why Make This Change? 58
Performance 5 59
RAM Footprint 5 59
User Experience 5 59
Data Structures and Files 5 59
Compatibility 5 59
Boot ROM Contents 5 60
Open Firmware 5 61
Open Firmware Script 5 62
NewWorld Boot Process 5 63
What Is Different 5 64
Outmoded Resources 5 65
NV-RAM 5 65
NanoKernel 5 66
Startup Disk Control Panel 5 66
Interrupt Layout 5 67
Machine Identiﬁcation 5 67
What Is Different 68
Abbreviations A 69
'ndrv' drivers 61 74
V, W, X, Y, Z 75
DEVELOPMENTAL EDITOR 76
ILLUSTRATOR 76
PRODUCTION EDITOR 76

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