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Technical Reference Guide
Compaq Deskpro 4000N and 4000S Personal Computers
First Edition -September
2-1
Chapter 2
SYSTEM OVERVIEW
2.
Chapter 2 SYSTEM OVERVIEW
2.1
INTRODUCTION
The Compaq Deskpro 4000N and 4000S Personal Computers are based on Pentium
microprocessors featuring MMX technology and designed with an emphasis on speed, storage
capacity, and multimedia compatibility to meet the requirements of the business environment.
These models feature architectures incorporating the PCI and ISA buses. All models are easily
upgradeable and expandable to keep pace with the needs of the office or home.
Figure 2–1.
Compaq Deskpro 4000S Personal Computer with Monitor
- Technical 1
- Reference 1
- Technical Reference Guide 4
- TABLE OF CONTENTS 5
- LIST OF FIGURES 10
- LIST OF TABLES 11
- Chapter 1 13
- INTRODUCTION 13
- Continued 15
- Chapter 2 19
- SYSTEM OVERVIEW 19
- 2.2 FEATURES 20
- 2.2.1 STANDARD FEATURES 20
- 2.2.2 MODEL DIFFERENCES 21
- 2.2.3 OPTIONS 21
- 2.3 MECHANICAL DESIGN 22
- 2.3.1 CABINET LAYOUT 22
- 2.3.2 CHASSIS LAYOUT 24
- 2.3.3 SYSTEM BOARD LAYOUT 25
- 2.4 SYSTEM ARCHITECTURE 26
- 2.4.1 MICROPROCESSOR 28
- 2.4.2 MEMORY 28
- 2.4.3 SUPPORT CHIPSET 29
- 2.4.4 MASS STORAGE 29
- 2.4.7 GRAPHICS SUBSYSTEM 30
- 2.5 SPECIFICATIONS 31
- Chapter 2 System Overview 34
- Chapter 3 35
- PROCESSOR/ 35
- MEMORY SUBSYSTEM 35
- 3.2.1.1 MMX Technology 37
- 3.2.4 SYSTEM MEMORY 39
- Chapter 4 43
- SYSTEM SUPPORT 43
- 4.2 PCI BUS OVERVIEW 44
- 4.2.1 PCI CONNECTOR 45
- 4.2.3 PCI BUS TRANSACTIONS 47
- 4.2.3.2 Configuration Cycles 47
- 4.2.5 PCI INTERRUPT MAPPING 51
- 4.2.6 PCI CONFIGURATION 52
- 4.3 ISA BUS OVERVIEW 53
- 4.3.1 ISA CONNECTOR 54
- 4.3.2 ISA BUS TRANSACTIONS 55
- 4.3.3 DIRECT MEMORY ACCESS 57
- 4.3.3.1 Page Registers 58
- 4.3.4 INTERRUPTS 60
- 4.3.4.1 Maskable Interrupts 60
- NMI- Generation 62
- SMI- Generation 63
- 4.3.5 INTERVAL TIMER 64
- 4.3.6 ISA CONFIGURATION 64
- Chapter 4 System Support 82
- 4.6.1 SYSTEM I/O MAP 83
- 4.7.2 PASSWORD PROTECTION 87
- 4.7.3 I/O SECURITY 88
- 4.7.4 USER SECURITY 88
- 4.7.5 TEMPERATURE SENSING 89
- 4.7.6 POWER MANAGEMENT 90
- Chapter 5 91
- INPUT/OUTPUT INTERFACES 91
- 5.2.2 IDE CONNECTORS 98
- 5.3 DISKETTE DRIVE INTERFACE 100
- 5.4 SERIAL INTERFACES 105
- 5.4.1 RS-232 INTERFACE 105
- 5.5 PARALLEL INTERFACE 111
- 5.6.3.1 8042 Configuration 120
- 5.6.3.2 8042 Control 121
- Continued 122
- (Continued) 123
- 1 DATA Data 4 + 5 VDC Power 124
- 5.7 ETHERNET INTERFACE 125
- 5.7.2 NIC CONNECTORS 126
- 5.8.1 USB CONFIGURATION 127
- 5.8.2 USB CONTROL 128
- 5.8.3 USB CONNECTOR 128
- Chapter 6 129
- GRAPHICS SUBSYSTEM 129
- 6.2 SUBSYSTEM DESCRIPTION 130
- 6.2.3.2 Subsystem Control 132
- MONITOR POWER CONTROL 133
- 6.2.5 CONNECTORS 134
- Chapter 7 135
- POWER and SIGNAL 135
- DISTRIBUTION 135
- 7.2.1 POWER SUPPLY ASSEMBLY 136
- 7.2.2 POWER CONTROL 137
- 7.3 POWER DISTRIBUTION 138
- 7.4 SIGNAL DISTRIBUTION 140
- Chapter 8 141
- BIOS ROM 141
- 8.2 BOOT FUNCTIONS 142
- 8.2.1 BOOT BLOCK 142
- 8.2.2 QUICKBOOT 142
- 8.2.3 SILENTBOOT 142
- ACCESSING CMOS 143
- SETTING DEFAULT PARAMETERS 143
- 8.4.1 SYSTEM ID 147
- Chapter 8 BIOS ROM 148
- Technical Reference Guide 149
- 8.4.3 TEMPERATURE SENSOR 152
- 8.4.4 DRIVE FAULT PREDICTION 152
- 8.4.5 DIMM SUPPORT 153
- 8.4.6 SECURITY FUNCTIONS 155
- 8.5 PNP SUPPORT 157
- 8.6 POWER MANAGEMENT SUPPORT 158
- Appendix A 161
- ERROR MESSAGES AND CODES 161
- Appendix B 173
- ASCII CHARACTER SET 173
- Appendix C 175
- KEYBOARD 175
- C.2 KEYSTROKE PROCESSING 176
- C.2.2 KEYBOARD LAYOUTS 178
- C.2.3 KEYS 181
- Changed - November 1996 182
- C.2.3.3 Windows Keystrokes 183
- C.2.4 KEYBOARD COMMANDS 184
- C.2.5 SCAN CODES 184
- C.3 SCANNER DESCRIPTION 188
- C.3.1 SCANNER OPERATION 189
- Appendix C Keyboard 190
- Compaq Personal Computers 190
- C.3.1.2 Image Quality 191
- C.3.2 SCANNER INTERFACE 192
- C.3.2.1 Pnyb Mode 193
- First Edition – July 1997 195
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