Compaq Deskpro Workstation AP230 Use and care manual

Technical Reference Guide
For
Compaq Deskpro Personal Computers
Covers 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 Personal Computers
Featuring Intel Celeron and Pentium III Processors
and the Intel 815E Chipset TR
G

Reader Feedback
Please feel free to send any questions, suggestions, corrections, or comments regarding this
document please to the following email address:
[email protected]
When responding, please state the title and edition of the referenced document.

Technical Reference Guide
Compaq Deskpro Personal Computers
Third Edition - April 2001
i
NOTICE
The information in this document is subject to change without notice.
COMPAQ COMPUTER CORPORATION SHALL NOT BE LIABLE FOR TECHNICAL OR
EDITORIAL ERRORS OR OMISSIONS HEREIN; NOR FOR INCIDENTAL OR
CONSEQUENTIAL DAMAGES RESULTING FROM THE FURNISHING, PERFORMANCE,
OR USE OF THIS MATERIAL. IT IS THE RESPONSIBILITY OF MANUFACTURERS TO
ENSURE THAT DEVICES DESIGNED TO BE USED WITH COMPAQ PRODUCTS
COMPLY WITH FCC CLASS B EMISSIONS REQUIREMENTS.
This guide contains information protected by copyright. Except for use in connection with the
described Compaq product, no part of this document may be photocopied or reproduced in any
form without prior written consent from Compaq Computer Corporation.
2000 Compaq Computer Corporation
All rights reserved. Published in the USA
Compaq, Deskpro, LTE, Contura, Presario, ProLinea
Registered U.S. Patent and Trademark Office
Product names mentioned in this document may be trademarks and/or registered trademarks of other companies.
“Celeron,” “Pentium” and “MMX” are registered trademarks of Intel Corporation.
“Microsoft,” “MS-DOS,” “Windows,” and “Windows NT” are registered trademarks of Microsoft Corporation.
For more information regarding specifications and Compaq-specific parts please contact Compaq
Computer Corporation.
Technical Reference Guide
for
Compaq Deskpro Personal Computers
First Edition - July 2000
Second Edition – September 2000
Third Edition – April 2001
Document Number 12YJ-0700C-WWEN

Technical Reference Guide
Compaq Deskpro Personal Computers
Third Edition –- April 2001
ii

Technical Reference Guide
Compaq Deskpro Personal Computers
Third Edition - April 2001
ii
i
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

Technical Reference Guide
Compaq Deskpro Personal Computers
Third Edition –- April 2001
iv
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
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

Technical Reference Guide
Compaq Deskpro Personal Computers
Third Edition - April 2001
v
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

Technical Reference Guide
Compaq Deskpro Personal Computers
Third Edition –- April 2001
vi
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
A.13 HARD DRIVE ERROR MESSAGES (17XX-XX)...................................................................A-8
A.14 HARD DRIVE ERROR MESSAGES (19XX-XX)...................................................................A-9

Technical Reference Guide
Compaq Deskpro Personal Computers
Third Edition - April 2001
vii
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

Technical Reference Guide
Compaq Deskpro Personal Computers
Third Edition –- April 2001
viii
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

Technical Reference Guide
Compaq Deskpro Personal Computers
Third Edition - April 2001
ix
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

Technical Reference Guide
Compaq Deskpro Personal Computers
Third Edition –- April 2001
x
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 QUADRO2MXRGRAPHICS 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

Technical Reference Guide
Compaq Deskpro Personal Computers
Third Edition - April 2001
xi
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. 48XCD-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
TABLE 5–12. DB-25 PARALLEL CONNECTOR PINOUT...............................................................................5-15
TABLE 5–13. 8042-TO-KEYBOARD COMMANDS .......................................................................................5-17

Technical Reference Guide
Compaq Deskpro Personal Computers
Third Edition –- April 2001
xii
TABLE 5–14. KEYBOARD INTERFACE CONFIGURATION REGISTERS ..........................................................5-18
TABLE 5–15. CPU COMMANDS TOTHE 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. PNPBIOSFUNCTIONS............................................................................................................8-15
TABLE 8-6. APM BIOS FUNCTIONS............................................................................................................8-20
TABLE A–1. BEEP/KEYBOARD LED CODES ...............................................................................................A-1
TABLE A–2. POWER-ONSELF 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
TABLE D-1. NVIDIA TNT2 PRO GRAPHICS DISPLAY MODES...................................................................D-3
TABLE D-2. MONITOR POWER MANAGEMENT CONDITIONS ......................................................................D-4

Technical Reference Guide
Compaq Deskpro Personal Computers
Third Edition - April 2001
xiii
TABLE D-3. DB-15 MONITOR CONNECTOR PINOUT...................................................................................D-5
TABLE E-1. NVIDIA QUADRO2EX/MXRGRAPHICS 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

Technical Reference Guide
Compaq Deskpro Personal Computers
Third Edition –- April 2001
xiv
This page is intentionally blank.