Compaq EN Series Manuals

Manuals and User Guides for Compaq EN Series. We have 3 Compaq EN Series manuals available for free PDF download: Technical Reference Manual, Hardware Reference Manual

Compaq EN Series Technical Reference Manual (237 pages)

Desktop and Minitower Form Factors

Brand: Compaq | Category: Desktop | Size: 1.04 MB

Technical Reference
1
Table of Contents
6
List of Figures
11
List of Tables
13
Chapter 1 Introduction

16
- About this Guide
  16
  - Using this Guide
    16
  - Additional Information Sources
    16
- Notational Conventions
  17
  - Values
    17
  - Ranges
    17
  - Signal Labels
    17
  - Register Notation and Usage
    17
  - Bit Notation
    17
- Common Acronyms and Abbreviations
  18
Chapter 2 System Overview

22
- Introduction
  22
- Figure 2-1. Compaq Deskpro
  22
- Features and Options
  23
  - Standard Features
    23
  - Options
    24
- Mechanical Design
  25
  - Cabinet Layouts
    25
  - Figure 2-2. Cabinet Layouts , F
    25
  - Figure 2-3. Cabinet Layouts , R
    26
  - Chassis Layouts
    27
  - Figure 2-4. Desktop Chassisl
    27
  - Figure 2-5. Minitower Chassis
    28
  - Board Layouts
    29
  - Figure 2-6. System Boardc
    29
- System Architecture
  31
  - Processor
    33
  - System Memory
    34
  - Support Chipset
    34
  - Mass Storage
    34
  - Serial and Parallel Interfaces
    35
  - Universal Serial Bus Interface
    35
  - Graphics Subsystem
    35
  - Audio Subsystem
    35
- Specifications
  36
Chapter 3 Processor/Memory Subsystem

40
- Introduction
  40
- Processor/Memory Subsystem
  40
  - Processor
    40
  - Figure 3-1. Processor /Memory
    41
  - Figure 3-2. Pentium II Processor
    42
  - Figure 3-3. Celeron Processor
    43
  - Processor Changing/Upgrading
    44
  - System Memory
    45
  - Figure 3-4. System Memorym
    47
  - Subsystem Configuration
    48
Chapter 4 System Support

50
- Introduction
  50
- Pci Bus Overview
  51
  - Pci Connector
    52
  - Pci Bus Master Arbitration
    53
  - Pci Bus Transactions
    54
  - Figure 4-3. Type 0 Configuration
    55
  - Option Rom Mapping
    57
  - Pci Interrupt Mapping
    58
  - Pci Power Management Support
    58
  - Pci Configuration
    59
- Agp Bus Overview
  60
  - Bus Transactions
    60
  - Agp Configuration
    63
  - Agp Connector
    64
- Isa Bus Overview
  65
  - Isa Connector
    66
  - Isa Bus Transactions
    67
  - Direct Memory Access
    69
  - Interrupts
    72
  - Figure 4-10. Maskable Interrupt
    72
  - Interval Timer
    76
  - Isa Configuration
    76
- System Clock Distribution
  77
- Real-Time Clock and Configuration Memory
  78
- Figure 4-11. Configurationm
  78
- I/O Map and Register Accessing
  95
  - System I/O Map
    95
  - Gpio Utilization
    96
- System Management Support
  100
  - Flash Rom Write Protect
    101
  - Password Protection
    101
  - I/O Security
    102
  - User Security
    102
  - Temperature Sensing
    103
  - Smart Cover Lock
    104
  - Smart Cover Removal Sensor
    104
  - Power Management
    105
  - Monitor Power Control
    106
Chapter 5 Input/Output Interfaces

108
- Introduction
  108
- Enhanced Ide Interface
  108
  - Ide Programming
    108
  - Figure 5-4. Serial Interface
    108
  - Ide Connector
    115
- Diskette Drive Interface
  116
  - Diskette Drive Programming
    117
  - Diskette Drive Connector
    120
- Serial Interfaces
  121
  - Interface
    121
  - Figure 5-3. Serial Interfaces
    121
  - Serial Interface Programming
    122
  - Table 5-11. Serial Interface
    123
- Parallel Interface
  127
  - Standard Parallel Port Mode
    127
  - Enhanced Parallel Port Mode
    128
  - Extended Capabilities Port Mode
    128
  - Parallel Interface Programming
    129
  - Table 5-13. Parallel Interface
    130
  - Parallel Interface Connector
    133
  - Figure 5-5. Parallel Interface
    133
  - Table 5-12. Parallel Interface
    133
  - Table 5-14. Db-25 Parallelc
    133
- Keyboard/Pointing Device Interface
  134
- Universal Serial Bus Interface
  141
  - Usb Keyboard Considerations
    141
  - Usb Configuration
    141
  - Usb Control
    142
  - Usb Connector
    142
  - Figure 5-8. Universal Serial
    142
Chapter 6 Audio Subsystem

144
- Introduction
  144
- Functional Description
  145
  - Figure 6-1. Audio Subsystem
    146
  - Figure 6-2. Analog Signals
    147
  - Pcm Audio Processing
    147
  - Figure 6-4. Audio Subsystem
    149
  - Table 6-1. Audio Moded
    149
  - Figure 6-6. Audio Car - to -Isa B
    150
  - Fm Synthesis Audio Processing
    150
- Programming
  151
  - Configuration
    151
  - Control
    152
  - Table 6-2. Audio Subsystem
    152
  - Table 6-3. Compatibility Mode
    152
  - Table 6-4. Extended Modea
    153
- Specifications
  154
- Table 6-6. Audio Subsystems
  154
Chapter 7 Power Supply and Distribution

156
- Introduction
  156
- Power Supply Assembly/Control
  156
  - Figure 7-1. Power Distribution and Figure 7-2. Power Cabled
    156
  - Power Supply Assembly
    157
  - Table 7-1. Power Supplya
    157
  - Power Control
    158
  - Wake up Events
    159
- Power Distribution
  160
  - 5/12 VDC Distribution
    160
  - Low Voltage Distribution
    161
  - Figure 7-3. Low Voltage Supply
    161
- Signal Distribution
  162
- Figure 7-4. Signal Distribution
  162
- Figure 7-5. Backplane Header
  163
Chapter 8 Bios Rom

164
- Introduction
  164
- Boot/Reset Functions
  165
  - Boot Block
    165
  - Quickboot
    165
  - Silentboot
    165
  - Reset
    165
- Memory Detection and Configuration
  166
- Desktop Management Support
  167
  - Table 8-1. Desktop Management
    167
  - System ID
    169
  - System Information Table
    169
  - Drive Fault Prediction
    176
  - Edid Retrieve
    176
  - System Map Retrieval
    177
  - Flash Rom Functions
    178
  - Power Button Functions
    178
  - Accessing Cmos
    179
  - Accessing Cmos Feature Bits
    179
  - Security Functions
    181
- Pnp Support
  182
  - Table 8-1. Pnp BIOS Functions
    182
  - Smbios
    183
- Power Management Functions
  184
  - Independent Pm Support
    184
  - Acpi Support
    184
  - Apm Support
    185
- Usb Legacy Support
  187
- Bios Upgrading
  187
Appendix Aerror MESSAGES and CODES

188
- Introduction
  188
- Power-On Messages
  188
- Beep/Keyboard Led Codes
  188
- Table A-1. Power-On Messages
  188
- Table A-2. Beep /Keyboard
  188
  - A.1 Introduction
    188
  - A.2 Power-On Messages
    188
  - A.3 Beep/Keyboard Led Codes
    188
- Power-On Self Test (Post) Messages
  189
- Table A-3. Power -O N Selft
  189
- Processor Error Messages
  190
- Table A-4. Processor Error
  190
- Memory Error Messages
  191
- Keyboard Error Messages
  191
- Table A-5. Memory Errorm
  191
- Table A-6. Keyboard Error
  191
- A.7 Keyboard Error Messages (30 X - XX )
  191
- Printer Error Messages
  192
- Video (Graphics) Error Messages
  192
- Table A-7. Printer Errorm
  192
- Table A-8. Video (Graphics ) E
  192
- Diskette Drive Error Messages
  193
- Serial Interface Error Messages
  193
- Table A-9. Diskette Drivee
  193
- Table A-10. Serial Interface
  193
- A.11 Serial Interface Error Messages (11 XX - XX )
  193
- Modem Communications Error Messages
  194
- Table 5-10. Serial Interface
  194
- Table A-11. Serial Interface
  194
- A.12 Modem Communications Error Messages (12 XX - XX )
  194
- Hard Drive Error Messages
  195
- A.13 Hard Drive Error Messages (17 XX - XX )
  195
- Hard Drive Error Messages
  196
- Video (Graphics) Error Messages
  196
- Table A-13. Hard Drive Error
  196
- Table A-14. Hard Drivem
  196
  - A.14 Hard Drive Error Messages (19 XX - XX )
    196
  - A.15 Video (Graphics) Error Messages (24 XX - XX )
    196
- Audio Error Messages (3206- XX
  197
- Network Interface Error Messages
  197
- Table A-15. Audio Errorm
  197
- Table A-16. Network Interface
  197
- A.17 Network Interface Error Messages (60 XX - XX )
  197
- Scsi Interface Error Messages
  198
- A.18 Scsi Interface Error Messages (65 XX - XX , 66 XX - XX , 67 XX - XX )
  198
- Pointing Device Interface Error Messages (8601- XX
  198
- Table A-17. Scsi Interfacee
  198
- Table A-18. Pointing Device
  198
- Cemm Priviledged Ops Error Messages
  199
- Cemm Exception Error Messages
  199
- Table A-19. Cemm Privileged
  199
- Table A-20. Cemm Exception
  199
Appendix B Ascii Character Set

200
- Introduction
  200
- Table B-1. Ascii Character
  200
- B.1 Introduction
  200
Appendix Ckeyboard

202
- Introduction
  202
- C.1 Introduction
  202
- Keystroke Processing
  203
  - C.2 Keystroke Processing
    203
  - Figure C-1. Keystrokep
    203
  - Figure C-2. Keyboard -T O -S
    204
  - Transmissions to the System
    204
  - C.2.2 Keyboard Layouts
    205
  - Figure C-3. U.s. English
    205
  - Figure C-4. National
    205
  - Keyboard Layouts
    205
  - Figure C-5. U.s. Englishw
    206
  - Figure C-6. National Windows
    206
  - C.2.3 Keys
    207
  - Keys
    207
    
    C.2.4 Keyboard Commands
    210
    
    C.2.5 Scan Codes
    210
  - Keyboard Commands
    210
  - Scan Codes
    210
  - Table C-1. Keyboard - to -System
    210
  - Table C-2. Keyboard Scanc
    211
Appendix D Compaq 10/100 Tx Pci Intel Wol Utp Controller Card

214
- D.1 Introduction
  214
- Figure D-1. Compaq
  214
- Functional Description
  214
- Introduction
  214
  - D.2 Functional Description
    215
  - D.2.1 Status Indicators
    215
- Figure D-2. Compaq 10/100 Tx Pci I
  215
- Status Indicators
  215
- 82558 Controller
  216
- Card Power and Clock
  216
- D.2.3 82558 Controller
  216
- Figure D-3. 82558 Controller
  216
- Power Management Support
  217
- Configuration/Control
  218
- Connector
  218
  - D.3 Configuration/Control
    218
  - D.4 Rj-45 Connector
    218
  - D.5 Specifications
    218
- Figure D-4. Ethernet Tpe C
  218
- Specifications
  218
- Table D-1. Operatings
  218
Appendix E Wide Ultra Scsi Host Adapter

220
- Introduction
  220
- Functional Description
  220
- Figure E-1. Wide Ultra Scsi H
  220
- E.1 Introduction
  220
- Figure E-2. Adaptec Aha-2940U U
  221
- E.2 Functional Description
  221
- Scsi Adapter Programming
  222
  - Scsi Adapter Configuration
    222
  - Scsi Adapter Control
    222
- Specifcations
  222
- Table E-1. Ultra Scsi Hosta
  222
- Table E-2. Ultra Scsi Hosta
  222
- E.4 Specifcations
  222
- User Guidelines
  223
- Table E-3. Wide Ultra Scsi a
  223
- E.5 User Guidelines
  223
- Scsi Connectors
  224
- Figure E-3. Ultra Scsi Connector
  224
- Table E-4. Scsi Connectorp
  224
- E.6 Scsi Connectors
  224
- Figure E-4. Wide Ultra Scsi C
  225
- Table E-5. Wide Ultra Scsi C
  225
Appendix F Ati Rage Pro Agp 1X/2X Graphics Cards

226
- Introduction
  226
- Functional Description
  226
- F.1 Introduction
  226
- Display Modes
  229
- Table F-1. 2D Graphics Display
  229
- Table F-2. 3D Graphics Display
  229
- F.3 Display Modes
  229
- Programming
  230
  - Configuration
    230
  - Control
    230
  - Table F-3. Ati Rage Pro Pci C
    230
  - Table F-4. Standard Vga M
    230
    
    F.4 Programming
    230
    
    F.4.1 Configuration
    230
    
    F.4.2 Control
    230
- Monitor Power Management Control
  231
- Connectors
  231
  - Memory Expansion Connector
    231
  - Table F-5. Monitor Powerm
    231
    
    F.6 Connectors
    231
    
    F.6.1 Memory Expansion Connector
    231
  - Monitor Connector
    232
  - Figure F-4. Vga Monitorc
    232
  - Table F-6. Db-15 Monitorc
    232
  - F.6.2 Monitor Connector
    232
  - Ati Multimedia Channel Connector
    233
  - Figure F-1. Ati Rage Pro Agp G
    233
  - Figure F-5. Amc Connector
    233
  - Table F-7. Multimedia Interface
    233

Compaq EN Series Technical Reference Manual (218 pages)

Net PC and Small Form Factor Models

Brand: Compaq | Category: Desktop | Size: 0.93 MB

Technical Reference
1
Table of Contents
5
List of Figures
10
List of Tables
12
Chapter 1 Introduction

15
- About this Guide
  15
  - Using this Guide
    15
  - Additional Information Sources
    15
- Notational Conventions
  16
  - Values
    16
  - Ranges
    16
  - Signal Labels
    16
  - Register Notation and Usage
    16
  - Bit Notation
    16
- Common Acronyms and Abbreviations
  17
Chapter 2 System Overview

21
- Introduction
  21
- Figure 2-1. Compaq Deskpro
  21
- Features and Options
  22
  - Standard Features
    22
  - Options
    23
- Mechanical Design
  24
  - Cabinet Layouts
    24
  - Figure 2-2. Cabinet Layout , F
    24
  - Figure 2-3. Cabinet Layout , R
    25
  - Chassis Layout
    26
  - Figure 2-4. Desktop Chassisl
    26
  - Board Layouts
    27
  - Figure 2-5. Board Connector and Figure 2-6. System Architecture
    27
  - System Board
    27
- System Architecture
  28
  - Pentium II Processor
    30
  - Memory
    30
  - Figure 2-7. Pentium
    30
  - Support Chipset
    31
  - Mass Storage
    31
  - Serial and Parallel Interfaces
    32
  - Universal Serial Bus Interface
    32
  - Graphics Subsystem
    32
  - Audio Subsystem
    32
- Specifications
  33
Chapter 3 Processor/Memory Subsystem

37
- Processor/Memory Subsystem
  38
  - Figure 3-1. Processor /Memory
    38
  - Intel Pentium II Processor
    39
    
    Figure 3-2. Pentium II Processor
    39
    
    MMX Technology
    39
    
    Thermal Considerations
    40
  - System Memory
    42
  - Figure 3-3. System Memorym
    44
  - Subsystem Configuration
    45
Chapter 4 System Support

47
- Introduction
  47
- Pci Bus Overview
  48
  - Pci Connector
    49
  - Pci Bus Master Arbitration
    50
  - Pci Bus Transactions
    51
  - Figure 4-3. Type 0 Configuration
    52
  - Option Rom Mapping
    54
  - Pci Interrupt Mapping
    55
  - Pci Power Management Support
    55
  - Pci Configuration
    56
- Agp Bus Overview
  57
  - Bus Transactions
    57
  - Agp Configuration
    60
- Isa Bus Overview
  61
  - Isa Connector
    62
  - Isa Bus Transactions
    63
  - Direct Memory Access
    65
  - Interrupts
    68
  - Figure 4-9. Maskable Interrupt
    68
  - Maskable Interrupts
    68
  - Interval Timer
    72
  - Isa Configuration
    72
- System Clock Distribution
  73
- Real-Time Clock and Configuration Memory
  74
- Figure 4-10. Configurationm
  74
- I/O Map and Register Accessing
  91
  - System I/O Map
    91
  - Gpio Utilization
    92
- System Management Support
  96
  - Flash Rom Write Protect
    97
  - Password Protection
    97
  - I/O Security
    98
  - User Security
    98
  - Temperature Sensing
    99
  - Smart Cover Lock
    100
  - Backplane Detect
    100
  - Power Management
    101
    
    Fan Control
    101
    
    Monitor Power Control
    102
Chapter 5 Input/Output Interfaces

103
- Introduction
  103
- Enhanced Ide Interface
  103
  - Ide Programming
    103
  - Figure 5-4. Serial Interface
    103
  - Table 5-27. Audio Subsystem
    103
  - Ide Connector
    110
- Diskette Drive Interface
  111
  - Diskette Drive Programming
    112
  - Diskette Drive Connector
    115
- Serial Interfaces
  116
  - Interface
    116
  - Figure 5-3. Serial Interfaces
    116
  - Serial Interface Programming
    117
  - Table 5-11. Serial Interface
    118
- Parallel Interface
  122
  - Standard Parallel Port Mode
    122
  - Enhanced Parallel Port Mode
    123
  - Extended Capabilities Port Mode
    123
  - Parallel Interface Programming
    124
  - Table 5-13. Parallel Interface
    125
  - Parallel Interface Connector
    128
  - Figure 5-5. Parallel Interface
    128
  - Table 5-12. Parallel Interface
    128
  - Table 5-14. Db-25 Parallelc
    128
- Keyboard/Pointing Device Interface
  129
- Universal Serial Bus Interface
  136
  - Usb Keyboard Considerations
    136
  - Usb Configuration
    136
  - Usb Control
    137
  - Usb Connector
    137
  - Figure 5-8. Universal Serial
    137
- Audio Subsystem
  138
  - Figure 5-9. Audio Subsystem
    139
  - Figure 5-10. Analog Signals
    140
  - Pcm Audio Processing
    140
  - Figure 5-12. Audio Subsystem
    141
  - Table 5-22. Audio Moded
    141
  - Figure 5-14. Audio Controller
    142
  - Fm Synthesis Audio Processing
    142
  - Programming
    143
  - Table 5-23. Audio Subsystem
    144
  - Table 5-24. Compatibilitym
    144
  - Table 5-25. Extended Modea
    145
  - Specifications
    146
- Network Interface Controller
  147
  - Functional Description
    147
  - Power Management Support
    148
  - Configuration/Control
    149
  - Connector
    149
  - Specifications
    149
  - Figure 5-16. Ethernet Tpe C
    149
  - Table 5-28. Operatings
    149
Chapter 6 Graphics Subsystem

151
- Introduction
  151
- Functional Description
  152
  - Figure 6-1. Graphics Subsystem
    152
  - Ati Rage Pro Turbo Agp Graphics Controller
    153
- Display Modes
  154
- Table 6-1. 2D Graphics Display
  154
- Table 6-1. 3D Graphics Display
  154
- Programming
  155
  - Configuration
    155
  - Control
    155
    
    Extended Vga Modes
    155
    
    Standard Vga Modes
    155
    
    Table 6-1. Standard Vga M
    155
- Monitor Power Management Control
  156
- Connectors
  156
  - Memory Expansion Connector
    156
  - Table 6-1. Monitor Powerm
    156
  - Monitor Connector
    157
  - Table 6-1. Db-15 Monitorc
    157
Chapter 7 Power Supply and Distribution

159
- Introduction
  159
- Power Supply Assembly/Control
  159
  - Figure 7-1. Power Distribution and Figure 7-2. Power Cabled
    159
  - Power Supply Assembly
    160
  - Table 7-1. Power Supplya
    160
  - Power Control
    161
  - Wake up Events
    162
- Power Distribution
  163
  - 5/12 VDC Distribution
    163
  - Low Voltage Distribution
    164
  - Figure 7-3. Low Voltage Supply
    164
- Signal Distribution
  165
- Figure 7-4. Signal Distribution
  165
- Figure 7-5. Header Pinouts
  166
Chapter 8 Bios Rom

167
- Introduction
  167
- Boot/Reset Functions
  168
  - Boot Block
    168
  - Quickboot
    168
  - Silentboot
    168
  - Reset
    168
- Memory Detection and Configuration
  169
- Desktop Management Support
  170
  - Table 8-1. Desktop Management
    170
  - System ID
    172
  - System Information Table
    172
  - Drive Fault Prediction
    179
  - Edid Retrieve
    179
  - System Map Retrieval
    180
  - Flash Rom Functions
    181
  - Power Button Functions
    181
  - Accessing Cmos
    182
  - Accessing Cmos Feature Bits
    182
  - Security Functions
    184
- Pnp Support
  185
  - Table 8-1. Pnp BIOS Functions
    185
  - Smbios
    186
- Power Management Functions
  187
  - Independent Pm Support
    187
  - Acpi Support
    187
  - Apm Support
    188
- Usb Legacy Support
  190
- Bios Upgrading
  190
Appendix Aerror MESSAGES and CODES

191
- Introduction
  191
- Power-On Messages
  191
- Beep/Keyboard Led Codes
  191
- Table A-1. Power-On Messages
  191
- Table A-2. Beep /Keyboard
  191
- Power-On Self Test (Post) Messages
  192
- Table A-3. Power -O N Selft
  192
- Processor Error Messages
  193
- Table A-4. Processor Error
  193
- Memory Error Messages
  194
- Keyboard Error Messages
  194
- Table A-5. Memory Errorm
  194
- Table A-6. Keyboard Error
  194
- Printer Error Messages
  195
- Video (Graphics) Error Messages
  195
- Table A-7. Printer Errorm
  195
- Table A-8. Video (Graphics ) E
  195
- Diskette Drive Error Messages
  196
- Serial Interface Error Messages
  196
- Table A-9. Diskette Drivee
  196
- Table A-10. Serial Interface
  196
- Modem Communications Error Messages
  197
- Table 5-10. Serial Interface
  197
- Table A-11. Serial Interface
  197
- Hard Drive Error Messages
  198
- Hard Drive Error Messages
  199
- Video (Graphics) Error Messages
  199
- Table A-13. Hard Drive Error
  199
- Table A-14. Hard Drivem
  199
- Audio Error Messages (3206- XX
  200
- Network Interface Error Messages
  200
- Table A-15. Audio Errorm
  200
- Table A-16. Network Interface
  200
- Scsi Interface Error Messages
  201
- Pointing Device Interface Error Messages (8601- XX
  201
- Table A-17. Scsi Interfacee
  201
- Table A-18. Pointing Device
  201
- Cemm Priviledged Ops Error Messages
  202
- Cemm Exception Error Messages
  202
- Table A-19. Cemm Privileged
  202
- Table A-20. Cemm Exception
  202
- Figure B-1. Ascii Character
  203
Appendix B Ascii Character Set

204
- Introduction
  205
Appendix C Keyboard

205
- Keystroke Processing
  206
  - Figure C-1. Keystrokep
    206
  - Figure C-2. Keyboard -T O -S
    207
  - Transmissions to the System
    207
  - Figure C-3. U.s. English
    208
  - Figure C-4. National
    208
  - Keyboard Layouts
    208
  - Figure C-5. U.s. Englishw
    209
  - Figure C-6. National Windows
    209
  - Keys
    210
  - Keyboard Commands
    213
  - Scan Codes
    213

Compaq EN Series Hardware Reference Manual (53 pages)

Convertible Minitower Models

Brand: Compaq | Category: Desktop | Size: 2.29 MB

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Compaq EN Series Manuals

Compaq EN Series Technical Reference Manual (237 pages)

Table of Contents

Chapter 1 Introduction

Chapter 2 System Overview

Chapter 3 Processor/Memory Subsystem

Chapter 4 System Support

Chapter 5 Input/Output Interfaces

Chapter 6 Audio Subsystem

Chapter 7 Power Supply and Distribution

Chapter 8 Bios Rom

Appendix Aerror MESSAGES and CODES

Appendix B Ascii Character Set

Appendix Ckeyboard

Appendix D Compaq 10/100 Tx Pci Intel Wol Utp Controller Card

Appendix E Wide Ultra Scsi Host Adapter

Appendix F Ati Rage Pro Agp 1X/2X Graphics Cards

Compaq EN Series Technical Reference Manual (218 pages)

Table of Contents

Chapter 1 Introduction

Chapter 2 System Overview

Chapter 3 Processor/Memory Subsystem

Chapter 4 System Support

Chapter 5 Input/Output Interfaces

Chapter 6 Graphics Subsystem

Chapter 7 Power Supply and Distribution

Chapter 8 Bios Rom

Appendix Aerror MESSAGES and CODES

Appendix B Ascii Character Set

Appendix C Keyboard

Compaq EN Series Hardware Reference Manual (53 pages)

Table of Contents

Chapter 1 Installation Guidelines

Chapter 2 Hardware Upgrades

Appendix A

Specifications

Appendix B

Hard Drive Installation Guidelines

Appendix C Battery Replacement

Appendix D Security Lock Provisions

Appendix E Electrostatic Discharge

Appendix F Routine Computer Care and Shipping Preparation

Index

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