Compaq Evo D500 - Convertible Minitower Use and care manual

Technical Reference Guide
For
Compaq Deskpro and Evo Personal Computers
Covers Evo D500, Deskpro EN and Deskpro Workstation AP230 Models
Featuring
Intel Celeron and Pentium III Processors
And the
Intel 815E Chipset

This document is designed to fit into a standard 3-ring binder. Provided below is a title block that can be
copied and/or cut out and placed into a slip or taped onto the edge of the binder.
Deskpro and Evo Personal Computers
Featuring Intel Celeron and Pentium III Processors
and the Intel 815E Chipset TR
G

Technical Reference Guide
Compaq Deskpro and Evo Personal Computers
Featuring Intel Celeron and Pentium III Processors
Fifth Edition - March 2002
i
NOTICE
© 2002 Compaq Information Technologies Group, L.P.
Compaq, the Compaq logo, Deskpro, and Evo are trademarks of the Compaq Information
Technologies Group, L.P. iPAQ is a trademark of Compaq Information Technologies
Group, L.P. in the United States and other countries. Microsoft, MS-DOS, Windows,
Windows NT are trademarks of Microsoft Corporation in the United States and other
countries. Intel, Pentium, Intel Inside, and Celeron are trademarks of Intel Corporation in
the U. S. and/or other countries. The Open Group, Motif, OSF/1, UNIX, the "X" device,
and IT DialTone are trademarks of The Open Group in the U. S. and other countries.
All other product names mentioned herein may be trademarks of their respective
companies.
Compaq shall not be liable for technical or editorial errors or omissions contained herein.
The information in this document is provided “as is” without warranty of any kind and is
subject to change without notice. The warranties for Compaq products are set forth in the
express limited warranty statements accompanying such products. Nothing herein should
be construed as constituting an additional warranty.
For more information regarding specifications and Compaq-specific parts please contact Compaq
Computer Corporation.
Technical Reference Guide
for
Compaq Deskpro and Evo Personal Computers
First Edition - July 2000
Second Edition – September 2000
Third Edition – April 2001
Fourth Edition - October 2001
Fifth Edition – March 2002
Document Number 12YJ-0502C-WWEN

Technical Reference Guide
Compaq Deskpro and Evo Personal Computers
Featuring Intel Celeron and Pentium III Processors
Fifth Edition –- March 2002
ii

Technical Reference Guide
TABLE OF CONTENTS
CHAPTER 1 INTRODUCTION ..................................................................................................................
1.1 ABOUT THIS GUIDE................................................................................................................ 1-1
1.1.1 ONLINE VIEWING............................................................................................................1-1
1.1.2 HARDCOPY ........................................................................................................................ 1-2
1.2 ADDITIONAL INFORMATION SOURCES ............................................................................ 1-2
1.3 MODEL NUMBERING CONVENTION ................................................................................. 1-2
1.4 SERIAL NUMBER .................................................................................................................... 1-2
1.5 NOTATIONAL CONVENTIONS.............................................................................................. 1-3
1.5.1 VALUES ............................................................................................................................. 1-3
1.5.2 RANGES ............................................................................................................................. 1-3
1.5.3 REGISTER NOTATION AND USAGE ............................................................................ 1-3
1.5.4 BIT NOTATION ................................................................................................................. 1-3
1.6 COMMON ACRONYMS AND ABBREVIATIONS ................................................................ 1-4
CHAPTER 2 SYSTEM OVERVIEW ..........................................................................................................
2.1 INTRODUCTION....................................................................................................................... 2-1
2.2 FEATURES AND OPTIONS ..................................................................................................... 2-2
2.2.1 STANDARD FEATURES .................................................................................................. 2-2
2.2.2 OPTIONS ............................................................................................................................ 2-3
2.3 MECHANICAL DESIGN...........................................................................................................2-4
2.3.1 CABINET LAYOUTS ........................................................................................................ 2-5
2.3.2 CHASSIS LAYOUTS ......................................................................................................... 2-7
2.3.3 BOARD LAYOUTS ......................................................................................................... 2-10
2.4 SYSTEM ARCHITECTURE .................................................................................................... 2-12
2.4.1 PROCESSORS .................................................................................................................. 2-14
2.4.2 CHIPSET........................................................................................................................... 2-16
2.4.3 SUPPORT COMPONENTS.............................................................................................. 2-16
2.4.4 SYSTEM MEMORY ........................................................................................................ 2-17
2.4.5 MASS STORAGE............................................................................................................. 2-17
2.4.6 SERIAL AND PARALLEL INTERFACES ..................................................................... 2-17
2.4.7 UNIVERSAL SERIAL BUS INTERFACE...................................................................... 2-17
2.4.8 NETWORK INTERFACE CONTROLLER..................................................................... 2-17
2.4.9 GRAPHICS SUBSYSTEM............................................................................................... 2-18
2.4.10 AUDIO SUBSYSTEM...................................................................................................... 2-19
2.5 SPECIFICATIONS ................................................................................................................... 2-19
CHAPTER 3 PROCESSOR/MEMORY SUBSYSTEM.............................................................................
3.1 INTRODUCTION....................................................................................................................... 3-1
3.2 PROCESSOR .............................................................................................................................. 3-2
3.2.1 CELERON PROCESSOR................................................................................................... 3-2
3.2.2 PENTIUM III PROCESSOR............................................................................................... 3-3
3.2.3 PROCESSOR UPGRADING.............................................................................................. 3-4
3.3 MEMORY SUBSYSTEM........................................................................................................... 3-5
3.4 SUBSYSTEM CONFIGURATION............................................................................................ 3-8
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CHAPTER 4 SYSTEM SUPPORT ..............................................................................................................
4.1 INTRODUCTION....................................................................................................................... 4-1
4.2 PCI BUS OVERVIEW................................................................................................................ 4-2
4.2.1 PCI BUS TRANSACTIONS............................................................................................... 4-3
4.2.2 PCI BUS MASTER ARBITRATION ................................................................................. 4-6
4.2.3 OPTION ROM MAPPING ................................................................................................. 4-7
4.2.4 PCI INTERRUPTS.............................................................................................................. 4-7
4.2.5 PCI POWER MANAGEMENT SUPPORT........................................................................ 4-7
4.2.6 PCI SUB-BUSSES .............................................................................................................. 4-7
4.2.7 PCI CONFIGURATION ..................................................................................................... 4-8
4.2.8 PCI CONNECTOR .............................................................................................................4-9
4.3 AGP BUS OVERVIEW ............................................................................................................ 4-10
4.3.1 BUS TRANSACTIONS.................................................................................................... 4-10
4.3.2 AGP CONFIGURATION ................................................................................................. 4-13
4.3.3 AGP CONNECTOR.......................................................................................................... 4-14
4.4 SYSTEM RESOURCES ........................................................................................................... 4-15
4.4.1 INTERRUPTS................................................................................................................... 4-15
4.4.2 DIRECT MEMORY ACCESS.......................................................................................... 4-19
4.5 SYSTEM CLOCK DISTRIBUTION........................................................................................ 4-22
4.6 REAL-TIME CLOCK AND CONFIGURATION MEMORY................................................. 4-23
4.6.1 CLEARING CMOS........................................................................................................... 4-23
4.6.2 CMOS ARCHIVE AND RESTORE................................................................................. 4-24
4.6.3 STANDARD CMOS LOCATIONS ................................................................................. 4-24
4.7 SYSTEM MANAGEMENT ..................................................................................................... 4-33
4.7.1 SECURITY FUNCTIONS ................................................................................................ 4-33
4.7.2 POWER MANAGEMENT ............................................................................................... 4-35
4.7.3 SYSTEM STATUS ........................................................................................................... 4-35
4.7.4 THERMAL SENSING AND COOLING ......................................................................... 4-36
4.8 REGISTER MAP AND MISCELLANEOUS FUNCTIONS ................................................... 4-38
4.8.1 SYSTEM I/O MAP ........................................................................................................... 4-38
4.8.2 82801 ICH2 GENERAL PURPOSE FUNCTIONS.......................................................... 4-39
4.8.3 LPC47B357 I/O CONTROLLER FUNCTIONS .............................................................. 4-40
CHAPTER 5 INPUT/OUTPUT INTERFACES..........................................................................................
5.1 INTRODUCTION....................................................................................................................... 5-1
5.2 ENHANCED IDE INTERFACE ................................................................................................ 5-1
5.2.1 IDE PROGRAMMING ....................................................................................................... 5-1
5.2.2 IDE CONNECTOR .............................................................................................................5-3
5.3 DISKETTE DRIVE INTERFACE.............................................................................................. 5-4
5.3.1 DISKETTE DRIVE PROGRAMMING.............................................................................. 5-5
5.3.2 DISKETTE DRIVE CONNECTOR ................................................................................... 5-7
5.4 SERIAL INTERFACE ................................................................................................................ 5-8
5.4.1 RS-232 INTERFACE..........................................................................................................5-8
5.4.2 COM1 PORT HEADER...................................................................................................... 5-9
5.4.3 SERIAL INTERFACE PROGRAMMING......................................................................... 5-9
5.5 PARALLEL INTERFACE........................................................................................................ 5-11
5.5.1 STANDARD PARALLEL PORT MODE ........................................................................ 5-11
5.5.2 ENHANCED PARALLEL PORT MODE........................................................................ 5-12
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5.5.3 EXTENDED CAPABILITIES PORT MODE .................................................................. 5-12
5.5.4 PARALLEL INTERFACE PROGRAMMING ................................................................ 5-13
5.5.5 PARALLEL INTERFACE CONNECTOR ...................................................................... 5-15
5.6 KEYBOARD/POINTING DEVICE INTERFACE .................................................................. 5-16
5.6.1 KEYBOARD INTERFACE OPERATION ...................................................................... 5-16
5.6.2 POINTING DEVICE INTERFACE OPERATION .......................................................... 5-18
5.6.3 KEYBOARD/POINTING DEVICE INTERFACE PROGRAMMING .......................... 5-18
5.6.4 KEYBOARD/POINTING DEVICE INTERFACE CONNECTOR ................................. 5-21
5.7 UNIVERSAL SERIAL BUS INTERFACE.............................................................................. 5-22
5.7.1 USB DATA FORMATS ................................................................................................... 5-22
5.7.2 USB PROGRAMMING .................................................................................................... 5-24
5.7.3 USB CONNECTOR.......................................................................................................... 5-25
5.7.4 USB CABLE DATA ......................................................................................................... 5-25
5.8 AUDIO SUBSYSTEM.............................................................................................................. 5-26
5.8.1 FUNCTIONAL ANALYSIS............................................................................................. 5-26
5.8.2 AC97 AUDIO CONTROLLER ........................................................................................ 5-28
5.8.3 AC97 LINK BUS .............................................................................................................. 5-28
5.8.4 AUDIO CODEC................................................................................................................ 5-29
5.8.5 AUDIO PROGRAMMING............................................................................................... 5-30
5.8.6 AUDIO SPECIFICATIONS ............................................................................................. 5-31
5.9 NETWORK INTERFACE CONTROLLER............................................................................. 5-32
5.9.1 WAKE ON LAN SUPPORT............................................................................................. 5-33
5.9.2 ALERT ON LAN SUPPORT............................................................................................ 5-33
5.9.3 POWER MANAGEMENT SUPPORT............................................................................. 5-34
5.9.4 NIC PROGRAMMING..................................................................................................... 5-35
5.9.5 NIC CONNECTOR........................................................................................................... 5-36
5.9.6 NIC SPECIFICATIONS ................................................................................................... 5-36
5.9.7 NIC UPGRADING/CHANGING ..................................................................................... 5-37
CHAPTER 6 EMBEDDED GRAPHICS SUBSYSTEM ............................................................................
6.1 INTRODUCTION....................................................................................................................... 6-1
6.2 INTEL 815E-BASED GRAPHICS SUBSYSTEM .................................................................... 6-2
6.2.1 FUNCTIONAL DESCRIPTION......................................................................................... 6-2
6.2.2 DISPLAY MODES .............................................................................................................6-4
6.2.3 MEMORY MANAGEMENT ............................................................................................. 6-4
6.2.4 815E-BASED GRAPHICS PROGRAMMING .................................................................. 6-5
6.2.5 UPGRADING 815E-BASED GRAPHICS ......................................................................... 6-5
6.3 NVIDIA GRAPHICS SUBSYSTEM.......................................................................................... 6-6
6.3.1 DISPLAY MODES .............................................................................................................6-7
6.3.2 NVIDIA GRAPHICS PROGRAMMING........................................................................... 6-7
6.3.3 NVIDIA GRAPHICS UPGRADING.................................................................................. 6-7
6.4 MONITOR POWER MANAGEMENT CONTROL.................................................................. 6-8
6.5 MONITOR CONNECTOR ......................................................................................................... 6-8
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Featuring Intel Celeron and Pentium III Processors
Fifth Edition - March 2002
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CHAPTER 7 POWER SUPPLY AND DISTRIBUTION...........................................................................
7.1 INTRODUCTION....................................................................................................................... 7-1
7.1 POWER SUPPLY ASSEMBLY/CONTROL ............................................................................. 7-1
7.1.1 POWER SUPPLY ASSEMBLY ......................................................................................... 7-2
7.1.1 POWER CONTROL ........................................................................................................... 7-3
7.1 POWER DISTRIBUTION ..........................................................................................................7-5
7.1.1 3.3/5/12 VDC DISTRIBUTION.......................................................................................... 7-5
7.1.1 LOW VOLTAGE DISTRIBUTION ................................................................................... 7-7
7.1 SIGNAL DISTRIBUTION .........................................................................................................7-8
CHAPTER 8 BIOS ROM ..............................................................................................................................
8.1 INTRODUCTION....................................................................................................................... 8-1
8.2 ROM FLASHING ....................................................................................................................... 8-2
8.2.1 UPGRADING...................................................................................................................... 8-2
8.2.2 CHANGEABLE SPLASH SCREEN.................................................................................. 8-3
8.3 BOOT FUNCTIONS................................................................................................................... 8-4
8.3.1 BOOT DEVICE ORDER .................................................................................................... 8-4
8.3.2 NETWORK BOOT (F12) SUPPORT................................................................................. 8-4
8.3.3 MEMORY DETECTION AND CONFIGURATION ........................................................ 8-5
8.3.4 BOOT ERROR CODES...................................................................................................... 8-5
8.4 SETUP UTILITY ........................................................................................................................ 8-6
8.5 CLIENT MANAGEMENT FUNCTIONS................................................................................ 8-12
8.5.1 SYSTEM ID AND ROM TYPE ....................................................................................... 8-14
8.5.2 EDID RETRIEVE ............................................................................................................. 8-14
8.5.3 TEMPERATURE STATUS .............................................................................................. 8-14
8.5.4 DRIVE FAULT PREDICTION ........................................................................................ 8-15
8.6 PNP SUPPORT ......................................................................................................................... 8-15
8.6.1 SMBIOS ............................................................................................................................ 8-16
8.7 POWER MANAGEMENT FUNCTIONS................................................................................ 8-17
8.7.1 INDEPENDENT PM SUPPORT ...................................................................................... 8-17
8.7.2 ACPI SUPPORT ............................................................................................................... 8-19
8.7.3 APM 1.2 SUPPORT.......................................................................................................... 8-19
8.8 USB LEGACY SUPPORT........................................................................................................ 8-23
A. APPENDIX A ERROR MESSAGES AND CODES...........................................................................
A.1 INTRODUCTION...................................................................................................................... A-1
A.2 BEEP/KEYBOARD LED CODES ............................................................................................ A-1
A.3 POWER-ON SELF TEST (POST) MESSAGES....................................................................... A-2
A.4 SYSTEM ERROR MESSAGES (1XX-XX) ................................................................................ A-3
A.5 MEMORY ERROR MESSAGES (2XX-XX).............................................................................. A-4
A.6 KEYBOARD ERROR MESSAGES (30X-XX).......................................................................... A-4
A.7 PRINTER ERROR MESSAGES (4XX-XX) ............................................................................... A-5
A.8 VIDEO (GRAPHICS) ERROR MESSAGES (5XX-XX) ............................................................ A-5
A.9 DISKETTE DRIVE ERROR MESSAGES (6XX-XX)................................................................ A-6
A.10 SERIAL INTERFACE ERROR MESSAGES (11XX-XX) ..................................................... A-6
A.11 MODEM COMMUNICATIONS ERROR MESSAGES (12XX-XX)..................................... A-7
A.12 SYSTEM STATUS ERROR MESSAGES (16XX-XX) .......................................................... A-8
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Featuring Intel Celeron and Pentium III Processors
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A.13 HARD DRIVE ERROR MESSAGES (17XX-XX) ................................................................. A-8
A.14 HARD DRIVE ERROR MESSAGES (19XX-XX) ................................................................. A-9
A.15 VIDEO (GRAPHICS) ERROR MESSAGES (24XX-XX) ...................................................... A-9
A.16 AUDIO ERROR MESSAGES (3206-XX)............................................................................ A-10
A.17 DVD/CD-ROM ERROR MESSAGES (33XX-XX) .............................................................. A-10
A.18 NETWORK INTERFACE ERROR MESSAGES (60XX-XX) ............................................. A-10
A.19 SCSI INTERFACE ERROR MESSAGES (65XX-XX, 66XX-XX, 67XX-XX)........................ A-11
A.20 POINTING DEVICE INTERFACE ERROR MESSAGES (8601-XX) ............................... A-11
APPENDIX B ASCII CHARACTER SET ..................................................................................................
B.1 INTRODUCTION.......................................................................................................................B-1
APPENDIX C KEYBOARD .........................................................................................................................
C.1 INTRODUCTION.......................................................................................................................C-1
C.2 KEYSTROKE PROCESSING....................................................................................................C-2
C.2.1 PS/2-TYPE KEYBOARD TRANSMISSIONS ..................................................................C-3
C.2.2 USB-TYPE KEYBOARD TRANSMISSIONS ..................................................................C-4
C.2.3 KEYBOARD LAYOUTS ...................................................................................................C-5
C.2.4 KEYS...................................................................................................................................C-8
C.2.5 KEYBOARD COMMANDS ............................................................................................C-11
C.2.6 SCAN CODES ..................................................................................................................C-11
C.3 CONNECTORS ........................................................................................................................C-16
APPENDIX D COMPAQ/NVIDIA TNT2 PRO AGP GRAPHICS CARD..............................................
D.1 INTRODUCTION...................................................................................................................... D-1
D.2 FUNCTIONAL DESCRIPTION................................................................................................ D-2
D.3 DISPLAY MODES .................................................................................................................... D-3
D.4 SOFTWARE SUPPORT INFORMATION ............................................................................... D-4
D.5 POWER MANAGEMENT AND CONSUMPTION................................................................. D-4
D.6 CONNECTORS ......................................................................................................................... D-5
D.6.1 MONITOR CONNECTOR ................................................................................................ D-5
APPENDIX E COMPAQ/NVIDIA QUADRO2 AGP GRAPHICS CARDS............................................
E.1 INTRODUCTION.......................................................................................................................E-1
E.2 FUNCTIONAL DESCRIPTION................................................................................................. E-2
E.3 DISPLAY MODES .....................................................................................................................E-3
E.4 SOFTWARE SUPPORT INFORMATION ................................................................................E-4
E.5 POWER MANAGEMENT AND CONSUMPTION..................................................................E-4
E.6 CONNECTORS ..........................................................................................................................E-5
E.6.1 MONITOR CONNECTOR E-5
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APPENDIX F COMPAQ/MATROX MILLENNIUM AGP GRAPHICS CARDS .................................
F.1 INTRODUCTION....................................................................................................................... F-1
F.2 FUNCTIONAL DESCRIPTION................................................................................................. F-2
F.3 DISPLAY MODES ..................................................................................................................... F-3
F.4 SOFTWARE SUPPORT INFORMATION ................................................................................ F-4
F.5 POWER MANAGEMENT AND CONSUMPTION.................................................................. F-4
F.6 CONNECTORS .......................................................................................................................... F-5
F.6.1 MONITOR CONNECTOR F-5
APPENDIX G COMPAQ/ADAPTEC SCSI HOST ADAPTER .............................................................
G.1 INTRODUCTION.....................................................................................................................G-1
G.2 FUNCTIONAL DESCRIPTION...............................................................................................G-2
G.3 SCSI ADAPTER PROGRAMMING........................................................................................G-3
G.3.1 SCSI ADAPTER CONFIGURATION .............................................................................G-3
G.3.2 SCSI ADAPTER CONTROL .......................................................................................... G-3
G.4 SPECIFICATIONS ...................................................................................................................G-3
G.5 SCSI CONNECTORS ...............................................................................................................G-4
G.5.1 EXTERNAL 50-PIN ULTRA SCSI CONNECTOR ........................................................G-4
G.5.2 INTERNAL 50-PIN ULTRA SCSI CONNECTOR .........................................................G-5
G.5.3 INTERNAL 68-PIN ULTRA160 SCSI CONNECTOR G-
6
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Featuring Intel Celeron and Pentium III Processors
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LIST OF FIGURES
FIGURE 2–1. COMPAQ DESKPRO PERSONAL COMPUTERS WITH MONITORS ............................................... 2-1
FIGURE 2–2. COMPAQ DESKPROS, FRONT VIEWS ...................................................................................... 2-5
FIGURE 2–3. COMPAQ DESKPROS, REAR VIEWS ........................................................................................ 2-6
FIGURE 2–4. SMALL FORM FACTOR CHASSIS LAYOUT, TOP VIEW ............................................................ 2-7
FIGURE 2–5. SLIM DESKTOP CHASSIS LAYOUT, TOP VIEW........................................................................ 2-8
FIGURE 2–6. CONFIGURABLE MINITOWER CHASSIS LAYOUT, LEFT SIDE VIEW (MINITOWER
CONFIGURATION).................................................................................................................................. 2-9
FIGURE 2–7. SMALL FORM FACTOR BOARD LAYOUTS............................................................................ 2-10
FIGURE 2–8. SLIM DESKTOP OR CONFIGURABLE MINITOWER SYSTEM BOARD LAYOUT ........................ 2-11
FIGURE 2–9. COMPAQ DESKPRO ARCHITECTURE, BLOCK DIAGRAM......................................................... 2-13
FIGURE 2–10. PROCESSOR ASSEMBLY AND MOUNTING .......................................................................... 2-14
FIGURE 3–1. PROCESSOR/MEMORY SUBSYSTEM ARCHITECTURE .............................................................. 3-1
FIGURE 3–2. CELERON PROCESSOR INTERNAL ARCHITECTURE ................................................................. 3-2
FIGURE 3–3. PENTIUM III PROCESSOR INTERNAL ARCHITECTURE ............................................................. 3-3
FIGURE 3–4. SYSTEM MEMORY MAP ......................................................................................................... 3-7
FIGURE 4-1. PCI BUS DEVICES AND FUNCTIONS......................................................................................... 4-2
FIGURE 4-2. CONFIGURATION CYCLE......................................................................................................... 4-4
FIGURE 4-3. PCI CONFIGURATION SPACE MAPPING .................................................................................. 4-5
FIGURE 4-4. PCI BUS CONNECTOR (32-BIT TYPE)..................................................................................... 4-9
FIGURE 4-5. AGP 1X DATA TRANSFER (PEAK TRANSFER RATE: 266 MB/S).......................................... 4-11
FIGURE 4-6. AGP 2X DATA TRANSFER (PEAK TRANSFER RATE: 532 MB/S).......................................... 4-12
FIGURE 4-7. AGP 4X DATA TRANSFER (PEAK TRANSFER RATE: 1064 MB/S)........................................ 4-12
FIGURE 4-8. UNIVERSAL AGP BUS CONNECTOR ..................................................................................... 4-14
FIGURE 4-9. MASKABLE INTERRUPT PROCESSING, BLOCK DIAGRAM...................................................... 4-15
FIGURE 4-10. CONFIGURATION MEMORY MAP ........................................................................................ 4-23
FIGURE 4-11. SMALL FORM FACTOR FAN CONTROL BLOCK DIAGRAM .................................................... 4-37
FIGURE 4-12. SLIM DESKTOP/CONFIGURABLE MINITOWER FAN CONTROL BLOCK DIAGRAM.................. 4-37
FIGURE 5-1. 40-PIN PRIMARY IDE CONNECTOR (ON SYSTEM BOARD)....................................................... 5-3
FIGURE 5-2. 34-PIN DISKETTE DRIVE CONNECTOR.................................................................................... 5-7
FIGURE 5-3. SERIAL INTERFACE CONNECTOR (MALE DB-9 AS VIEWED FROM REAR OF CHASSIS) ............. 5-8
FIGURE 5-4. COM1 SERIAL INTERFACE HEADER (SMALL FORM FACTOR SYSTEM BOARD ONLY) ............. 5-9
FIGURE 5-5. PARALLEL INTERFACE CONNECTOR (FEMALE DB-25 AS VIEWED FROM REAR OF CHASSIS). 5-15
FIGURE 5-6. 8042-TO-KEYBOARD TRANSMISSION OF CODE EDH, TIMING DIAGRAM ............................. 5-16
FIGURE 5-7. KEYBOARD OR POINTING DEVICE INTERFACE CONNECTOR ................................................. 5-21
FIGURE 5-8. USB I/F, BLOCK DIAGRAM.................................................................................................. 5-22
FIGURE 5-9. USB PACKET FORMATS ....................................................................................................... 5-23
FIGURE 5-10. UNIVERSAL SERIAL BUS CONNECTOR................................................................................ 5-25
FIGURE 5-11. AUDIO SUBSYSTEM FUNCTIONAL BLOCK DIAGRAM .......................................................... 5-27
FIGURE 5-12. AC’97 LINK BUS PROTOCOL ............................................................................................. 5-28
FIGURE 5-13. AD1881 AUDIO CODEC FUNCTIONAL BLOCK DIAGRAM ................................................... 5-29
FIGURE 5-14. NETWORK INTERFACE CONTROLLER BLOCK DIAGRAM ..................................................... 5-32
FIGURE 5-15. ETHERNET TPE CONNECTOR (RJ-45, VIEWED FROM CARD EDGE) ..................................... 5-36
FIGURE 5-16. REMOTE SYSTEM ALERT IMPLEMENTATION (GENERIC REPRESENTATION) ........................ 5-37
FIGURE 5-17. RSA LOGIC, BLOCK DIAGRAM .......................................................................................... 5-37
FIGURE 6-1. 815E-BASED GRAPHICS, BLOCK DIAGRAM ............................................................................ 6-2
FIGURE 6-2. 82815 GMCH INTEGRATED GRAPHICS SUBSYSTEM............................................................. 6-3
FIGURE 6-3. NVIDIA TNT2 PRO GRAPHICS SUBSYSTEM ........................................................................... 6-6
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FIGURE 7–1. POWER DISTRIBUTION AND CONTROL, BLOCK DIAGRAM ..................................................... 7-1
FIGURE 7–2. SMALL FORM FACTOR POWER CABLE DIAGRAM.................................................................. 7-5
FIGURE 7–3. SLIM DESKTOP/CONFIGURABLE MINITOWER POWER CABLE DIAGRAM ................................ 7-6
FIGURE 7–4. LOW VOLTAGE SUPPLY AND DISTRIBUTION DIAGRAM ......................................................... 7-7
FIGURE 7–5. SMALL FORM FACTOR SIGNAL DISTRIBUTION DIAGRAM ...................................................... 7-8
FIGURE 7–6. SLIM DESKTOP/CONFIGURABLE MINITOWER SIGNAL DISTRIBUTION DIAGRAM................... 7-9
FIGURE 7–7. HEADER PINOUTS ................................................................................................................ 7-10
FIGURE B–1. ASCII CHARACTER SET........................................................................................................B-1
FIGURE C–1. KEYSTROKE PROCESSING ELEMENTS, BLOCK DIAGRAM ......................................................C-2
FIGURE C–2. PS/2 KEYBOARD-TO-SYSTEM TRANSMISSION, TIMING DIAGRAM .......................................C-3
FIGURE C–3. U.S. ENGLISH (101-KEY) KEYBOARD KEY POSITIONS .........................................................C-5
FIGURE C–4. NATIONAL (102-KEY) KEYBOARD KEY POSITIONS ..............................................................C-5
FIGURE C–5. U.S. ENGLISH WINDOWS (101W-KEY) KEYBOARD KEY POSITIONS ....................................C-6
FIGURE C–6. NATIONAL WINDOWS (102W-KEY) KEYBOARD KEY POSITIONS .........................................C-6
FIGURE C–7. 7-BUTTON EASY ACCESS KEYBOARD LAYOUT.....................................................................C-7
FIGURE C–8. 8-BUTTON EASY ACCESS KEYBOARD LAYOUT.....................................................................C-7
FIGURE C–9. PS/2 KEYBOARD CABLE CONNECTOR (MALE) ...................................................................C-16
FIGURE C–10. USB KEYBOARD CABLE CONNECTOR (MALE) .................................................................C-16
FIGURE D-1. COMPAQ/NVIDIA TNT2 PRO AGP GRAPHICS CARD (P/N 198998-B21) LAYOUT ............ D-1
FIGURE D-2. NVIDIA TNT2 PRO GRAPHICS CARD BLOCK DIAGRAM ..................................................... D-2
FIGURE D-3. VGA MONITOR CONNECTOR, (FEMALE DB-15, AS VIEWED FROM REAR). ............................ D-5
FIGURE E-1. COMPAQ/NVIDIA QUADRO2 EX/MXR AGP GRAPHICS CARD LAYOUT.............................E-1
FIGURE E-2. NVIDIA QUADRO2 MXR GRAPHICS CARD BLOCK DIAGRAM..............................................E-2
FIGURE E-3. VGA MONITOR CONNECTOR (FEMAL DB-15, AS VIEWED FROM REAR) ................................E-2
FIGURE F-1. COMPAQ/MATROX MILLIENNIUM AGP GRAPHICS CARD LAYOUT....................................... F-1
FIGURE F-2. MATROX MILLENNIUM GRAPHICS CARD BLOCK DIAGRAM ................................................... F-2
FIGURE F-3. VGA MONITOR CONNECTOR (FEMAL DB-15, AS VIEWED FROM REAR) ................................ F-2
FIGURE G–1. COMPAQ/ADAPTEC 29160N SCSI HOST ADAPTER CARD LAYOUT (PCA# 157342-001) ... G-1
FIGURE G–2. COMPAQ/ADAPTEC ULTRA SCSI ADAPTER CARD BLOCK DIAGRAM .................................. G-2
FIGURE G–3. EXTERNAL ULTRA SCSI CONNECTOR (50-PIN) ................................................................... G-4
FIGURE G–4. INTERNAL 50-PIN ULTRA SCSI CONNECTOR ....................................................................... G-5
FIGURE G–5. ULTRA 160 SCSI CONNECTOR (68-PIN HEADER TYPE) ...................................................... G-6
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Technical Reference Guide
LIST OF TABLES
TABLE 1–1. ACRONYMS AND ABBREVIATIONS .......................................................................................... 1-3
TABLE 2-1. FEATURE DIFFERENCE MATRIX............................................................................................... 2-2
TABLE 2-2. CHIPSET COMPARISON........................................................................................................... 2-16
TABLE 2-3. SUPPORT COMPONENT FUNCTIONS........................................................................................ 2-16
TABLE 2-4. GRAPHICS SUBSYSTEM COMPARISON.................................................................................... 2-18
TABLE 2-5. ENVIRONMENTAL SPECIFICATIONS........................................................................................ 2-19
TABLE 2-6. ELECTRICAL SPECIFICATIONS................................................................................................ 2-19
TABLE 2-7. PHYSICAL SPECIFICATIONS.................................................................................................... 2-20
TABLE 2-8. DISKETTE DRIVE SPECIFICATIONS.......................................................................................... 2-20
TABLE 2-9. 48X CD-ROM DRIVE SPECIFICATIONS ................................................................................. 2-21
TABLE 2-10. HARD DRIVE SPECIFICATIONS ............................................................................................. 2-21
TABLE 3–1. CELERON PROCESSOR STATISTICAL COMPARISON ................................................................. 3-2
TABLE 3–2. PENTIUM III PROCESSOR STATISTICAL COMPARISON ............................................................. 3-3
TABLE 3–3. SPD ADDRESS MAP (SDRAM DIMM).................................................................................... 3-6
TABLE 3–4. HOST/PCI BRIDGE CONFIGURATION REGISTERS (GMCH, FUNCTION 0)................................. 3-8
TABLE 4-1. PCI DEVICE CONFIGURATION ACCESS .................................................................................... 4-4
TABLE 4-2. SYSTEM BOARD PCI DEVICE IDENTIFICATION ........................................................................ 4-5
TABLE 4-3. PCI BUS MASTERING DEVICES ............................................................................................... 4-6
TABLE 4-4. LPC BRIDGE CONFIGURATION REGISTERS (ICH2, FUNCTION 0) ............................................. 4-8
TABLE 4-5. PCI BUS CONNECTOR PINOUT................................................................................................. 4-9
TABLE 4-6. PCI/AGP BRIDGE CONFIGURATION REGISTERS (MCH, FUNCTION 1) ................................... 4-13
TABLE 4-7. AGP BUS CONNECTOR PINOUT.............................................................................................. 4-14
TABLE 4-8. MASKABLE INTERRUPT PRIORITIES AND ASSIGNMENTS ........................................................ 4-16
TABLE 4-9. MASKABLE INTERRUPT CONTROL REGISTERS ....................................................................... 4-17
TABLE 4-10. DEFAULT DMA CHANNEL ASSIGNMENTS........................................................................... 4-19
TABLE 4-11. DMA PAGE REGISTER ADDRESSES ..................................................................................... 4-20
TABLE 4-12. DMA CONTROLLER REGISTERS .......................................................................................... 4-21
TABLE 4-13. CLOCK GENERATION AND DISTRIBUTION ............................................................................ 4-22
TABLE 4-14. CONFIGURATION MEMORY (CMOS) MAP .......................................................................... 4-24
TABLE 4-15. SYSTEM BOOT/ROM FLASH STATUS LED INDICATIONS ..................................................... 4-35
TABLE 4-16. SYSTEM OPERATIONAL STATUS LED INDICATIONS ............................................................. 4-36
TABLE 4-17. SYSTEM I/O MAP ................................................................................................................ 4-38
TABLE 4-18. 82801 ICH2 GPIO REGISTER UTILIZATION......................................................................... 4-39
TABLE 4-19 LPC47B357 CONTROL REGISTERS ....................................................................................... 4-40
TABLE 4-20. LPC47B357 GPIO REGISTER UTILIZATION......................................................................... 4-41
TABLE 5–1. IDE PCI CONFIGURATION REGISTERS.................................................................................... 5-2
TABLE 5–2. IDE BUS MASTER CONTROL REGISTERS ................................................................................ 5-2
TABLE 5–3. 40-PIN PRIMARY IDE CONNECTOR PINOUT ............................................................................ 5-3
TABLE 5–4. DISKETTE DRIVE CONTROLLER CONFIGURATION REGISTERS................................................. 5-5
TABLE 5–5. DISKETTE DRIVE INTERFACE CONTROL REGISTERS................................................................ 5-6
TABLE 5–6. 34-PIN DISKETTE DRIVE CONNECTOR PINOUT ....................................................................... 5-7
TABLE 5–7. DB-9 SERIAL CONNECTOR PINOUT ........................................................................................ 5-8
TABLE 5–8. SERIAL INTERFACE CONFIGURATION REGISTERS.................................................................... 5-9
TABLE 5–9. SERIAL INTERFACE CONTROL REGISTERS ............................................................................. 5-10
TABLE 5–10. PARALLEL INTERFACE CONFIGURATION REGISTERS........................................................... 5-13
TABLE 5–11. PARALLEL INTERFACE CONTROL REGISTERS...................................................................... 5-14
Compaq Deskpro and Evo Personal Computers
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TABLE 5–12. DB-25 PARALLEL CONNECTOR PINOUT .............................................................................. 5-15

Technical Reference Guide
TABLE 5–13. 8042-TO-KEYBOARD COMMANDS...................................................................................... 5-17
TABLE 5–14. KEYBOARD INTERFACE CONFIGURATION REGISTERS ......................................................... 5-18
TABLE 5–15. CPU COMMANDS TO THE 8042.......................................................................................... 5-20
TABLE 5–16. KEYBOARD/POINTING DEVICE CONNECTOR PINOUT .......................................................... 5-21
TABLE 5–17. USB INTERFACE CONFIGURATION REGISTERS ................................................................... 5-24
TABLE 5–18. USB CONTROL REGISTERS ................................................................................................. 5-24
TABLE 5–19. USB CONNECTOR PINOUT.................................................................................................. 5-25
TABLE 5–20. USB CABLE LENGTH DATA................................................................................................ 5-25
TABLE 5–21. AC’97 AUDIO CONTROLLER PCI CONFIGURATION REGISTERS.......................................... 5-30
TABLE 5–22. AC’97 AUDIO CODEC CONTROL REGISTERS....................................................................... 5-30
TABLE 5–23. AUDIO SUBSYSTEM SPECIFICATIONS .................................................................................. 5-31
TABLE 5–24. AOL EVENTS...................................................................................................................... 5-33
TABLE 5–25. NIC CONTROLLER PCI CONFIGURATION REGISTERS ......................................................... 5-35
TABLE 5–26. NIC CONTROL REGISTERS.................................................................................................. 5-35
TABLE 5–27. 82559 NIC OPERATING SPECIFICATIONS............................................................................ 5-36
TABLE 5–28. REMOTE SYSTEM ALERT EVENTS ....................................................................................... 5-38
TABLE 6-1. INTEL GRAPHICS DISPLAY MODES .......................................................................................... 6-4
TABLE 6-2. 815-BASED GRAPHICS CONTROLLER PCI CONFIGURATION REGISTERS .................................. 6-5
TABLE 6-3. NVIDIA TNT2 PRO GRAPHICS DISPLAY MODES .................................................................... 6-7
TABLE 6-4. MONITOR POWER MANAGEMENT CONDITIONS ....................................................................... 6-8
TABLE 6-5. DB-15 MONITOR CONNECTOR PINOUT ................................................................................... 6-8
TABLE 8-1. BOOT BLOCK CODES ................................................................................................................. 8-2
TABLE 8-2. BOOT ERROR CODES ................................................................................................................. 8-5
TABLE 8-3. SETUP UTILITY FUNCTIONS ..................................................................................................... 8-6
TABLE 8-4. CLIENT MANAGEMENT FUNCTIONS (INT15)......................................................................... 8-12
TABLE 8-5. PNP BIOS FUNCTIONS .......................................................................................................... 8-15
TABLE 8-6. APM BIOS FUNCTIONS .......................................................................................................... 8-20
TABLE A–1. BEEP/KEYBOARD LED CODES ............................................................................................. A-1
TABLE A–2. POWER-ON SELF TEST (POST) MESSAGES........................................................................... A-2
TABLE A–3. SYSTEM ERROR MESSAGES................................................................................................... A-3
TABLE A–4. MEMORY ERROR MESSAGES................................................................................................. A-4
TABLE A–5. KEYBOARD ERROR MESSAGES ............................................................................................. A-4
TABLE A–6. PRINTER ERROR MESSAGES .................................................................................................. A-5
TABLE A–7. VIDEO (GRAPHICS) ERROR MESSAGES ................................................................................. A-5
TABLE A–8. DISKETTE DRIVE ERROR MESSAGES..................................................................................... A-6
TABLE A–9. SERIAL INTERFACE ERROR MESSAGES.................................................................................. A-6
TABLE A–10. SERIAL INTERFACE ERROR MESSAGES................................................................................ A-7
TABLE A–11. SYSTEM STATUS ERROR MESSAGES ................................................................................... A-8
TABLE A–12. HARD DRIVE ERROR MESSAGES ......................................................................................... A-8
TABLE A–13. HARD DRIVE ERROR MESSAGES ......................................................................................... A-9
TABLE A–14. HARD DRIVE MESSAGES..................................................................................................... A-9
TABLE A–15. AUDIO ERROR MESSAGES................................................................................................. A-10
TABLE A–16. DVD/CD-ROM DRIVE ERROR MESSAGES....................................................................... A-10
TABLE A–17. NETWORK INTERFACE ERROR MESSAGES......................................................................... A-10
TABLE A–18. SCSI INTERFACE ERROR MESSAGES ................................................................................ A-11
TABLE A–19. POINTING DEVICE INTERFACE ERROR MESSAGES............................................................. A-11
TABLE C–1. KEYBOARD-TO-SYSTEM COMMANDS...................................................................................C-11
TABLE C–2. KEYBOARD SCAN CODES .....................................................................................................C-12
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Technical Reference Guide
TABLE D-1. NVIDIA TNT2 PRO GRAPHICS DISPLAY MODES ................................................................. D-3
TABLE D-2. MONITOR POWER MANAGEMENT CONDITIONS ..................................................................... D-4
TABLE D-3. DB-15 MONITOR CONNECTOR PINOUT ................................................................................. D-5
TABLE E-1. NVIDIA QUADRO2 EX/MXR GRAPHICS DISPLAY MODES ...................................................E-3
TABLE E-2. MONITOR POWER MANAGEMENT CONDITIONS.......................................................................E-4
TABLE E-3. DB-15 MONITOR CONNECTOR................................................................................................E-5
TABLE F-1. MATROX MILLENNIUM GRAPHICS DISPLAY MODES ............................................................... F-3
TABLE F-2. MONITOR POWER MANAGEMENT CONDITIONS ....................................................................... F-4
TABLE F-3. DB-15 MONITOR CONNECTOR................................................................................................ F-5
TABLE G–1. SCSI HOST ADAPTER CARD CONTROL REGISTER MAPPING.................................................. G-3
TABLE G–2. ULTRA SCSI HOST ADAPTER CARD SPECIFICATIONS............................................................. G-3
TABLE G–3. EXTERNAL 50-PIN ULTRA SCSI CONNECTOR PINOUT............................................................ G-4
TABLE G–4. INTERNAL 50-PIN ULTRA SCSI CONNECTOR PINOUT............................................................. G-5
TABLE G–5. ULTRA 160 SCSI CONNECTOR PINOUT .................................................................................. G-6
Compaq Deskpro and Evo Personal Computers
Featuring Intel Celeron and Pentium III Processors
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Compaq Deskpro and Evo Personal Computers
Featuring Intel Celeron and Pentium III Processors
Fifth Edition –- March 2002
xiv

Technical Reference Guide
Chapter 1
INTRODUCTION
1. Chapter 1 INTRODUCTION
1.1 ABOUT THIS GUIDE
This guide provides technical information about Compaq Evo, Deskpro EN and Deskpro
Workstation AP230 Personal Computers that feature Intel Celeron or Pentium III processors and
the Intel 815E chipset. This document describes in detail the system’s design and operation for
programmers, engineers, technicians, and system administrators, as well as end-users wanting
detailed information.
The chapters of this guide primarily describe the hardware and firmware elements and primarily
deal with the system board and the power supply assembly. The appendices contain general data
such as error codes and information about standard peripheral devices such as keyboards, graphics
cards, and communications adapters.
This guide can be used either as an online document or in hardcopy form.
1.1.1 ONLINE VIEWING
Online viewing allows for quick navigating and convenient searching through the document. A
color monitor will also allow the user to view the color shading used to highlight differential data.
A softcopy of the latest edition of this guide is available for downloading in .pdf file format at the
URL listed below:
http://www.compaq.com/support/techpubs/technical_reference_guides/index.html
Viewing the file requires a copy of Adobe Acrobat Reader available at no charge from Adobe
Systems, Inc. at the following URL:
http://www.adobe.com
When viewing with Adobe Acrobat Reader, click on the ( ) icon or "Bookmarks" tab to
display the navigation pane for quick access to particular places in the guide.
1.1.2 HARDCOPY
A hardcopy of this guide may be obtained by printing from the .pdf file. The document is
designed for printing in an 8 ½ x 11-inch format. Note that printing in black and white will lose
color shading properties.
Compaq Deskpro and Evo Personal Computers
Featuring Intel Celeron and Pentium III Processors
Fifth Edition – March 2002
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Chapter 1 Introduction
1.2 ADDITIONAL INFORMATION SOURCES
For more information on components mentioned in this guide refer to the indicated
manufacturers’ documentation, which may be available at the following online sources:
♦ Compaq Computer Corporation: http://www.compaq.com
♦ Intel Corporation: http://www.intel.com
♦ Standard Microsystems Corporation: http://www.smsc.com
♦ Texas Instruments Inc.: http://www.ti.com
♦ USB user group: http://www.usb.org
1.3 MODEL NUMBERING CONVENTION
The model numbering convention for Compaq Deskpro units is as follows:
ENX/XNNN/NNX/N/NNNx
Removable storage: b = CD/CDRW, c = CD, d = DVD, r = CDRW, z = ZIP
Memory (in MB)
OS type: 2 = Windows 2000; 6 = Dual install. Windows NT 4.0 or 2000)
Chipset type (b = 810E, e = 815E)
Hard drive size (in GB)
Processor speed (3 digits, in MHz; 2 digits, in GHz)
Processor type: C = Celeron; P = Pentium
Form factor: S = Small form factor, L = slim desktop, C = Convertible minitower
1.4 SERIAL NUMBER
The unit’s serial number is located on a sticker placed on the exterior cabinet. The serial number
may also be read with the Compaq Diagnostics or Compaq Insight Manager utilities.
Compaq Deskpro and Evo Personal Computers
Featuring Intel Celeron and Pentium III Processors
Fifth Edition – March 2002
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