Apple iMac Manuale Utente Scaricare il pdf (Pagina 47)

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CHAPTER 4

RAM Expansion

The Expansion Slots 47

Figure 4-5 EMI shield

Locations of the Expansion Slots 4

Figure 4-6 shows the location of the two main RAM expansion slots and the

video RAM expansion slot.

One of the main RAM expansion slots is on the bottom of the processor module

and is normally occupied by the factory-installed SO-DIMM. The other main

RAM expansion slot is on the top of the processor module and is available for a

user-installed SO-DIMM.

1 2 ... 42 43 44 45 46 47 48 49 50 51 52 ... 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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Apple iMac Manuale Utente Pagina 47

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