Apple iMac Manual do Utilizador descarregar pdf (Página 46)

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CHAPTER 4

RAM Expansion

46 The Expansion Slots

Removing the Logic Board Assembly 4

With the retaining screws removed and the cables positioned to the sides, the

user can remove the logic board assembly by pulling upward on the handle, as

shown in Figure 4-4.

Figure 4-4 Removing the logic board assembly

IMPORTANT

While removing and reinstalling the logic board assembly,

you should take care to align the door of the CD drive with

the opening in the front of the case. ▲

Removing the EMI Shield 4

Once the logic board assembly is free of the case, you can see the EMI shield,

which covers the processor module. To gain access to the main RAM expansion

slots, you must remove the EMI shield, as shown in Figure 4-5.

1 2 ... 41 42 43 44 45 46 47 48 49 50 51 ... 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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