Apple Desktop Computer Bedienungsanleitung PDF herunterladen (Seite 68)

CHAPTER 5

Software

68 What Is Different

ToolBox ROM Image, so sharing the same Box Flag is not an issue for those

areas.

IMPORTANT

Programs such as control panels and installers that use Box

Flag to verify that this is a valid CPU on which to execute

need to be changed to verify the existence of the hardware

they require. Developers should look for the features they

need, rather than reading the Box Flag and then making

assumptions about the computer’s features. ▲

Asset management software that reports the kind of machine it is run on should

check the name registry for the value of the property at

Devices:device-tree:model. For the current iMac, the property value is iMac,1.

1 2 ... 63 64 65 66 67 68 69 70 71 72 73 74 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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