Compaq Deskpro EN Series of Personal Computers
Net PC and Small Form Factor Models
Covering Models Featuring
Intel Celeron, Pentium II, and Pentium III Processors
and the
Intel 440BX AGPset
The hardcopy is designed to be placed into a standard 3-ring binder. Provided below is a title block that
can be copied or cut out and placed into the slip or taped onto the edge of the binder.
Deskpro EN Series of Personal Computers
TRG
Net PC and Small Form Factor Models
Featuring Intel Celeron, Pentium II, and Pentium III Processors and the 440BX AGPset
Technical Reference Guide
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. No part of this document may be
photocopied or reproduced in any form without prior written consent from Compaq Computer
Corporation.
1998 Compaq Computer Corporation
All rights reserved. Printed 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.
"Pentium, " "Celeron," and "MMX" are trademarks of Intel Corporation.
"Windows" is a trademark of Microsoft Corporation.
For more information regarding specifications and Compaq-specific parts please contact Compaq
Computer Corporation, Industry Relations Department.
Technical Reference Guide
for
Compaq Deskpro EN Series of Personal Computers, Net PC and Small Form Factor Models
Third Edition April 2000
Document Number DSK-008C/0698
i
Compaq Deskpro EN Series of Personal Computers
Net PC and Small Form Factor Models
Third Edition - April 2000
Technical Reference Guide
ii Compaq Deskpro EN Series of Personal Computers
Net PC and Small Form Factor Models
Third Edition - April 2000
Technical Reference Guide
TABLE OF CONTENTS
CHAPTER 1 INTRODUCTION.............................................................................................................
1. 1 ABOUT THIS GUIDE ........................................................................................................... 1-1
1.1.1 USING THIS GUIDE ..................................................................................................... 1-1
1. 1. 2 ADDITIONAL INFORMATION SOURCES.................................................................. 1-1
1.2 NOTATIONAL CONVENTIONS.......................................................................................... 1-2
1.2.1 VALUES ........................................................................................................................ 1-2
1.2.2 RANGES........................................................................................................................ 1-2
1.2.3 SIGNAL LABELS.......................................................................................................... 1-2
1.2.4 REGISTER NOTATION AND USAGE ......................................................................... 1-2
1.2.5 BIT NOTATION ............................................................................................................ 1-2
1.3 COMMON ACRONYMS AND ABBREVIATIONS.............................................................. 1-3
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.................................................................................................... 2-4
2.3.2 CHASSIS LAYOUT....................................................................................................... 2-6
2.3.3 BOARD LAYOUTS ....................................................................................................... 2-7
2.4 SYSTEM ARCHITECTURE.................................................................................................. 2-8
2.4.1 PROCESSOR ............................................................................................................... 2-10
2.4.2 MEMORY .................................................................................................................... 2-10
2.4.3 SUPPORT CHIPSET .................................................................................................... 2-11
2.4.4 MASS STORAGE ........................................................................................................ 2-11
2.4.5 SERIAL AND PARALLEL INTERFACES .................................................................. 2-12
2.4.6 UNIVERSAL SERIAL BUS INTERFACE ................................................................... 2-12
2.4.7 GRAPHICS SUBSYSTEM ........................................................................................... 2-12
2.4.8 AUDIO SUBSYSTEM ................................................................................................. 2-12
2.5 SPECIFICATIONS .............................................................................................................. 2-13
CHAPTER 3 PROCESSOR/MEMORY SUBSYSTEM ........................................................................
3.1 INTRODUCTION .................................................................................................................. 3-1
3.2 PROCESSOR/MEMORY SUBSYSTEM .............................................................................. 3-2
3.2.1 PROCESSORS ............................................................................................................... 3-3
3.2.2 SYSTEM MEMORY...................................................................................................... 3-7
3.2.3 SUBSYSTEM CONFIGURATION............................................................................... 3-10
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Compaq Deskpro EN Series of Personal Computers
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Technical Reference Guide
CHAPTER 4 SYSTEM SUPPORT.........................................................................................................
4.1 INTRODUCTION .................................................................................................................. 4-1
4.2 PCI BUS OVERVIEW ........................................................................................................... 4-2
4.2.1 PCI CONNECTOR......................................................................................................... 4-3
4.2.2 PCI BUS MASTER ARBITRATION.............................................................................. 4-4
4.2.3 PCI BUS TRANSACTIONS........................................................................................... 4-5
4.2.4 OPTION ROM MAPPING ............................................................................................. 4-8
4. 2. 5 PCI INTERRUPT MAPPING ......................................................................................... 4-9
4.2.6 PCI POWER MANAGEMENT SUPPORT..................................................................... 4-9
4.2.7 PCI CONFIGURATION............................................................................................... 4-10
4.3 AGP BUS OVERVIEW ....................................................................................................... 4-11
4.3.1 BUS TRANSACTIONS................................................................................................ 4-11
4.3.2 AGP CONFIGURATION ............................................................................................. 4-14
4.4 ISA BUS OVERVIEW......................................................................................................... 4-15
4. 4. 1 ISA CONNECTOR ...................................................................................................... 4-16
4.4.2 ISA BUS TRANSACTIONS......................................................................................... 4-17
4.4.3 DIRECT MEMORY ACCESS...................................................................................... 4-19
4.4.4 INTERRUPTS .............................................................................................................. 4-22
4.4.5 INTERVAL TIMER..................................................................................................... 4-26
4.4.6 ISA CONFIGURATION............................................................................................... 4-26
4.5 SYSTEM CLOCK DISTRIBUTION .................................................................................... 4-27
4.6 REAL-TIME CLOCK AND CONFIGURATION MEMORY............................................... 4-28
4.7 I/O MAP AND REGISTER ACCESSING............................................................................ 4-45
4. 7. 1 SYSTEM I/O MAP ...................................................................................................... 4-45
4.7.2 GPIO UTILIZATION ................................................................................................... 4-46
4.8 SYSTEM MANAGEMENT SUPPORT ............................................................................... 4-50
4.8.1 FLASH ROM WRITE PROTECT ................................................................................ 4-51
4.8.2 PASSWORD PROTECTION........................................................................................ 4-51
4.8.3 I/O SECURITY ............................................................................................................ 4-52
4.8.4 USER SECURITY........................................................................................................ 4-52
4.8.5 TEMPERATURE SENSING ........................................................................................ 4-53
4.8.6 SMART COVER LOCK............................................................................................... 4-54
4.8.7 BACKPLANE DETECT .............................................................................................. 4-54
4.8.8 POWER MANAGEMENT ........................................................................................... 4-55
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 CONNECTORS ...................................................................................................... 5-7
5.3 DISKETTE DRIVE INTERFACE.......................................................................................... 5-9
5.3.1 DISKETTE DRIVE PROGRAMMING ........................................................................ 5-10
5.3.2 DISKETTE DRIVE CONNECTOR.............................................................................. 5-13
5.4 SERIAL INTERFACES ....................................................................................................... 5-14
5.4.1 RS-232 INTERFACE ................................................................................................... 5-14
5.4.2 SERIAL INTERFACE PROGRAMMING .................................................................... 5-15
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5.5 PARALLEL INTERFACE ................................................................................................... 5-20
5.5.1 STANDARD PARALLEL PORT MODE ..................................................................... 5-20
5. 5. 2 ENHANCED PARALLEL PORT MODE ..................................................................... 5-21
5.5.3 EXTENDED CAPABILITIES PORT MODE ............................................................... 5-21
5.5.4 PARALLEL INTERFACE PROGRAMMING .............................................................. 5-22
5. 5. 5 PARALLEL INTERFACE CONNECTOR ................................................................... 5-26
5.6 KEYBOARD/POINTING DEVICE INTERFACE ............................................................... 5-27
5.6.1 KEYBOARD INTERFACE OPERATION ................................................................... 5-27
5.6.2 POINTING DEVICE INTERFACE OPERATION ....................................................... 5-29
5.6.3 KEYBOARD/POINTING DEVICE INTERFACE PROGRAMMING ......................... 5-29
5.6.4 KEYBOARD/POINTING DEVICE INTERFACE CONNECTOR................................ 5-33
5. 7 UNIVERSAL SERIAL BUS INTERFACE........................................................................... 5-34
5. 7. 1 USB KEYBOARD CONSIDERATIONS...................................................................... 5-34
5.7.2 USB CONFIGURATION.............................................................................................. 5-34
5.7.3 USB CONTROL........................................................................................................... 5-35
5.7.4 USB CONNECTOR ..................................................................................................... 5-35
5. 8 AUDIO SUBSYSTEM ......................................................................................................... 5-36
PCM AUDIO PROCESSING....................................................................................................... 5-38
5. 8. 2 FM SYNTHESIS AUDIO PROCESSING..................................................................... 5-40
5.8.3 PROGRAMMING ........................................................................................................ 5-41
5. 8. 4 SPECIFICATIONS....................................................................................................... 5-44
5.9 NETWORK INTERFACE CONTROLLER.......................................................................... 5-45
5.9.1 FUNCTIONAL DESCRIPTION ................................................................................... 5-45
5.9.2 POWER MANAGEMENT SUPPORT.......................................................................... 5-46
5.9.3 CONFIGURATION/CONTROL ................................................................................... 5-47
5.9.4 RJ-45 CONNECTOR.................................................................................................... 5-47
5. 9. 5 SPECIFICATIONS....................................................................................................... 5-47
CHAPTER 6 GRAPHICS SUBSYSTEM...............................................................................................
6.1 INTRODUCTION .................................................................................................................. 6-1
6.2 FUNCTIONAL DESCRIPTION............................................................................................. 6-2
6.2.1 ATI RAGE PRO TURBO AGP GRAPHICS CONTROLLER ......................................... 6-3
6.3 DISPLAY MODES ................................................................................................................ 6-4
6.4 PROGRAMMING.................................................................................................................. 6-5
6.4.1 CONFIGURATION ........................................................................................................ 6-5
6.4.2 CONTROL ..................................................................................................................... 6-5
6.5 MONITOR POWER MANAGEMENT CONTROL ............................................................... 6-6
6.6 CONNECTORS ..................................................................................................................... 6-6
6. 6. 1 MEMORY EXPANSION CONNECTOR ....................................................................... 6-6
6.6.2 MONITOR CONNECTOR............................................................................................. 6-7
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CHAPTER 7 POWER SUPPLY AND DISTRIBUTION.......................................................................
7.1 INTRODUCTION .................................................................................................................. 7-1
7.2 POWER SUPPLY ASSEMBLY/CONTROL .......................................................................... 7-1
7.2.1 POWER SUPPLY ASSEMBLY ..................................................................................... 7-2
7.2.2 POWER CONTROL....................................................................................................... 7-3
7.3 POWER DISTRIBUTION...................................................................................................... 7-5
7.3.1 3.3/5/12 VDC DISTRIBUTION...................................................................................... 7-5
7.3.2 LOW VOLTAGE DISTRIBUTION................................................................................ 7-6
7.4 SIGNAL DISTRIBUTION ..................................................................................................... 7-7
CHAPTER 8 BIOS ROM .......................................................................................................................
8.1 INTRODUCTION .................................................................................................................. 8-1
8.2 BOOT/RESET FUNCTIONS ................................................................................................. 8-2
8.2.1 BOOT BLOCK............................................................................................................... 8-2
8.2.2 QUICKBOOT................................................................................................................. 8-2
8.2.3 SILENTBOOT ............................................................................................................... 8-2
8.2.4 RESET ........................................................................................................................... 8-2
8.3 MEMORY DETECTION AND CONFIGURATION.............................................................. 8-3
8.4 DESKTOP MANAGEMENT SUPPORT ............................................................................... 8-4
8. 4. 1 SYSTEM ID................................................................................................................... 8-6
8.4.2 SYSTEM INFORMATION TABLE ............................................................................... 8-6
8.4.3 EDID RETRIEVE ........................................................................................................ 8-13
8.4.4 DRIVE FAULT PREDICTION..................................................................................... 8-13
8.4.5 SYSTEM MAP RETRIEVAL....................................................................................... 8-14
8.4.6 FLASH ROM FUNCTIONS ......................................................................................... 8-15
8.4.7 POWER BUTTON FUNCTIONS ................................................................................. 8-15
8.4.8 ACCESSING CMOS.................................................................................................... 8-16
8.4.9 ACCESSING CMOS FEATURE BITS......................................................................... 8-16
8.4.10 SECURITY FUNCTIONS ............................................................................................ 8-18
8.5 PNP SUPPORT .................................................................................................................... 8-19
8.5.1 SMBIOS ....................................................................................................................... 8-20
8.6 POWER MANAGEMENT FUNCTIONS ............................................................................ 8-21
8.6.1 INDEPENDENT PM SUPPORT .................................................................................. 8-21
8.6.2 ACPI SUPPORT........................................................................................................... 8-21
8.6.3 APM SUPPORT ........................................................................................................... 8-22
8.7 USB LEGACY SUPPORT ................................................................................................... 8-24
8.8 BIOS UPGRADING............................................................................................................. 8-24
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Technical Reference Guide
APPENDIX A ERROR MESSAGES AND CODES...............................................................................
A.1 INTRODUCTION ................................................................................................................. A-1
A.2 POWER-ON MESSAGES..................................................................................................... A-1
A.3 BEEP/KEYBOARD LED CODES ........................................................................................ A-1
A.4 POWER-ON SELF TEST (POST) MESSAGES.................................................................... A-2
PROCESSOR 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
HARD DRIVE ERROR MESSAGES (17XX-XX) ............................................................... A-8
A.13
HARD DRIVE ERROR MESSAGES (19XX-XX) ............................................................... A-9
A.14
VIDEO (GRAPHICS) ERROR MESSAGES (24XX-XX) .................................................... A-9
A.15
AUDIO ERROR MESSAGES (3206-XX)......................................................................... A-10
A.16
NETWORK INTERFACE ERROR MESSAGES (60XX-XX) ........................................... A-10
A.17
SCSI INTERFACE ERROR MESSAGES (65XX-XX, 66XX-XX, 67XX-XX) ....................... A-11
A.18
POINTING DEVICE INTERFACE ERROR MESSAGES (8601-XX).............................. A-11
A.19
A.20 CEMM PRIVILEDGED OPS ERROR MESSAGES........................................................ A-12
A.21 CEMM EXCEPTION ERROR MESSAGES ................................................................... A-12
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 TRANSMISSIONS TO THE SYSTEM ..........................................................................C-3
C.2.2 KEYBOARD LAYOUTS ...............................................................................................C-4
C.2.3 KEYS .............................................................................................................................C-6
C.2.4 KEYBOARD COMMANDS...........................................................................................C-9
C.2.5 SCAN CODES ...............................................................................................................C-9
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Compaq Deskpro EN Series of Personal Computers
Net PC and Small Form Factor Models
Third Edition - April 2000
Technical Reference Guide
LIST OF FIGURES
FIGURE 21. COMPAQ DESKPRO EN SERIES SMALL FORM FACTOR PERSONAL COMPUTER WITH MONITOR2-1
FIGURE 22. CABINET LAYOUT, FRONT VIEW ....................................................................................... 2-4
FIGURE 23. CABINET LAYOUT, REAR VIEW ......................................................................................... 2-5
FIGURE 24. DESKTOP CHASSIS LAYOUT, TOP VIEW.............................................................................. 2-6
FIGURE 25. BOARD CONNECTOR AND SWITCH LOCATIONS ................................................................... 2-7
FIGURE 26. SYSTEM ARCHITECTURE, BLOCK DIAGRAM ........................................................................ 2-9
FIGURE 27. PROCESSOR ASSEMBLY COMPARISON .............................................................................. 2-10
FIGURE 31. PROCESSOR/MEMORY SUBSYSTEM ARCHITECTURE ............................................................ 3-2
FIGURE 32. CELERON PROCESSOR INTERNAL ARCHITECTURE ............................................................... 3-3
FIGURE 33. PENTIUM II/PENTIUM III PROCESSOR INTERNAL ARCHITECTURE......................................... 3-4
FIGURE 34. SYSTEM MEMORY MAP..................................................................................................... 3-9
FIGURE 41. PCI BUS DEVICES AND FUNCTIONS..................................................................................... 4-2
FIGURE 42. PCI BUS CONNECTOR (32-BIT 5-VOLT TYPE) .................................................................... 4-3
FIGURE 43. TYPE 0 CONFIGURATION CYCLE........................................................................................ 4-6
FIGURE 44. PCI CONFIGURATION SPACE MAP...................................................................................... 4-7
FIGURE 45. AGP 1X DATA TRANSFER (PEAK TRANSFER RATE: 266 MB/S) ........................................ 4-12
FIGURE 46. AGP 2X DATA TRANSFER (PEAK TRANSFER RATE: 532 MB/S) ........................................ 4-13
FIGURE 47. ISA BUS BLOCK DIAGRAM................................................................................................ 4-15
FIGURE 48. ISA EXPANSION CONNECTOR.......................................................................................... 4-16
FIGURE 49. MASKABLE INTERRUPT PROCESSING, BLOCK DIAGRAM.................................................... 4-22
FIGURE 410. CONFIGURATION MEMORY MAP .................................................................................... 4-28
FIGURE 51. 40-PIN IDE CONNECTOR. ................................................................................................. 5-7
FIGURE 5-2. 50-PIN IDE CD-ROM CONNECTOR.................................................................................... 5-8
FIGURE 53. 34-PIN DISKETTE DRIVE CONNECTOR............................................................................... 5-13
FIGURE 54. SERIAL INTERFACES BLOCK DIAGRAM .............................................................................. 5-14
FIGURE 55. SERIAL INTERFACE CONNECTOR (MALE DB-9 AS VIEWED FROM REAR OF CHASSIS) ............ 5-14
FIGURE 56. PARALLEL INTERFACE CONNECTOR (FEMALE DB-25 AS VIEWED FROM REAR OF CHASSIS) ... 5-26
FIGURE 57. 8042-TO-KEYBOARD TRANSMISSION OF CODE EDH, TIMING DIAGRAM............................. 5-27
FIGURE 58. KEYBOARD OR POINTING DEVICE INTERFACE CONNECTOR................................................ 5-33
FIGURE 59. UNIVERSAL SERIAL BUS CONNECTOR (ONE OF TWO AS VIEWED FROM REAR OF CHASSIS) ..... 5-35
FIGURE 510. AUDIO SUBSYSTEM BLOCK DIAGRAM ............................................................................. 5-37
FIGURE 511. ANALOG SIGNAL SAMPLING/QUANTIZING....................................................................... 5-38
FIGURE 512. DAC OPERATION .......................................................................................................... 5-38
FIGURE 513. AUDIO SUBSYSTEM-TO-ISA BUS PCM AUDIO DATA FORMATS / BYTE ORDERING ........... 5-39
FIGURE 514. FM SYNTHESIS PATCH................................................................................................... 5-40
FIGURE 515. AUDIO CONTROLLER-TO-ISA BUS FM AUDIO DATA FORMAT ......................................... 5-40
FIGURE 516. 10/100 TX NETWORK INTERFACE CONTROLLER BLOCK DIAGRAM .................................. 5-45
FIGURE 517. ETHERNET TPE CONNECTOR (RJ-45, VIEWED FROM CARD EDGE) .................................... 5-47
FIGURE 6-1. GRAPHICS SUBSYSTEM BLOCK DIAGRAM ............................................................................ 6-2
FIGURE 71. POWER DISTRIBUTION AND CONTROL, BLOCK DIAGRAM..................................................... 7-1
FIGURE 72. POWER CABLE DIAGRAM .................................................................................................. 7-5
FIGURE 73. LOW VOLTAGE SUPPLY, BLOCK DIAGRAM.......................................................................... 7-6
FIGURE 74. SIGNAL DISTRIBUTION DIAGRAM FOR 1998 BEZEL SYSTEM ................................................ 7-7
FIGURE 75. SIGNAL DISTRIBUTION DIAGRAM FOR 1999 BEZEL SYSTEM ................................................ 7-8
FIGURE 76. HEADER/JUMPER PINOUTS................................................................................................. 7-9
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Technical Reference Guide
FIGURE B1. ASCII CHARACTER SET ................................................................................................... B-1
FIGURE C1. KEYSTROKE PROCESSING ELEMENTS, BLOCK DIAGRAM ....................................................C-2
FIGURE C2. KEYBOARD-TO-SYSTEM TRANSMISSION OF CODE 58H, TIMING DIAGRAM..........................C-3
FIGURE C3. U.S. ENGLISH (101-KEY) KEYBOARD KEY POSITIONS.......................................................C-4
FIGURE C4. NATIONAL (102-KEY) KEYBOARD KEY POSITIONS ............................................................C-4
FIGURE C5. U.S. ENGLISH WINDOWS (101W-KEY) KEYBOARD KEY POSITIONS ...................................C-5
FIGURE C6. NATIONAL WINDOWS (102W-KEY) KEYBOARD KEY POSITIONS ........................................C-5
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Technical Reference Guide
LIST OF TABLES
TABLE 11. ACRONYMS AND ABBREVIATIONS....................................................................................... 1-3
TABLE 21. MODEL DIFFERENCES........................................................................................................... 2-8
TABLE 22. SUPPORT CHIPSETS .......................................................................................................... 2-11
TABLE 23. GRAPHICS SUBSYSTEM OVERVIEW.................................................................................... 2-12
TABLE 24. ENVIRONMENTAL SPECIFICATIONS.................................................................................... 2-13
TABLE 25. ELECTRICAL SPECIFICATIONS ........................................................................................... 2-13
TABLE 26. PHYSICAL SPECIFICATIONS ............................................................................................... 2-13
TABLE 27. DISKETTE DRIVE SPECIFICATIONS..................................................................................... 2-14
TABLE 28. 24X CD-ROM DRIVE SPECIFICATIONS.............................................................................. 2-14
TABLE 29. HARD DRIVE SPECIFICATIONS........................................................................................... 2-15
TABLE 31. PROCESSOR COMPARISON..................................................................................................... 3-5
TABLE 32. BUS/CORE SPEED SWITCH SETTINGS................................................................................... 3-6
TABLE 33. SPD ADDRESS MAP (SDRAM DIMM)................................................................................. 3-8
TABLE 34. HOST/PCI BRIDGE CONFIGURATION REGISTERS (443BX, FUNCTION 0) .............................. 3-10
TABLE 41. PCI BUS CONNECTOR PINOUT ............................................................................................ 4-3
TABLE 42. PCI BUS MASTERING DEVICES ........................................................................................... 4-4
TABLE 43. PCI DEVICE CONFIGURATION ACCESS ................................................................................ 4-6
TABLE 44. PCI FUNCTION CONFIGURATION ACCES.............................................................................. 4-7
TABLE 45. PCI DEVICE IDENTIFICATION ............................................................................................. 4-8
TABLE 46. PCI/ISA BRIDGE CONFIGURATION REGISTERS (82371, FUNCTION 0) .................................. 4-10
TABLE 47. PCI/AGP BRIDGE CONFIGURATION REGISTERS (82371, FUNCTION 1)................................. 4-14
TABLE 48. ISA EXPANSION CONNECTOR PINOUT............................................................................... 4-16
TABLE 49. DEFAULT DMA CHANNEL ASSIGNMENTS ......................................................................... 4-19
TABLE 410. DMA PAGE REGISTER ADDRESSES ................................................................................. 4-20
TABLE 411. DMA CONTROLLER REGISTERS...................................................................................... 4-21
TABLE 412. MASKABLE INTERRUPT PRIORITIES AND ASSIGNMENTS.................................................... 4-23
TABLE 413. MASKABLE INTERRUPT CONTROL REGISTERS.................................................................. 4-23
TABLE 414. INTERVAL TIMER FUNCTIONS ......................................................................................... 4-26
TABLE 415. INTERVAL TIMER CONTROL REGISTERS........................................................................... 4-26
TABLE 416. CLOCK GENERATION AND DISTRIBUTION ........................................................................ 4-27
TABLE 417. CONFIGURATION MEMORY (CMOS) MAP....................................................................... 4-29
TABLE 418. SYSTEM I/O MAP........................................................................................................... 4-45
TABLE 419. 82371 SOUTH BRIDGE GENERAL PURPOSE INPUT PORT UTILIZATION ............................... 4-46
TABLE 420. 82371 SOUTH BRIDGE GENERAL PURPOSE OUTPUT PORT UTILIZATION............................. 4-47
TABLE 421. 87307 I/O CONTROLLER PNP STANDARD CONTROL REGISTERS ........................................ 4-48
TABLE 422. SYSTEM MANAGEMENT CONTROL REGISTERS ................................................................... 4-50
TABLE 51. IDE PCI CONFIGURATION REGISTERS ................................................................................ 5-2
TABLE 52. IDE BUS MASTER CONTROL REGISTERS.............................................................................. 5-2
TABLE 53. IDE ATA CONTROL REGISTERS.......................................................................................... 5-3
TABLE 54. IDE CONTROLLER COMMANDS .......................................................................................... 5-6
TABLE 55. 40-PIN IDE CONNECTOR PINOUT ....................................................................................... 5-7
TABLE 56. 50-PIN IDE CD-ROM CONNECTOR PINOUT ....................................................................... 5-8
TABLE 57. DISKETTE DRIVE CONTROLLER CONFIGURATION REGISTERS ............................................. 5-10
TABLE 58. DISKETTE DRIVE CONTROLLER REGISTERS ....................................................................... 5-11
TABLE 59. 34-PIN DISKETTE DRIVE CONNECTOR PINOUT ................................................................... 5-13
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TABLE 510. DB-9 SERIAL CONNECTOR PINOUT.................................................................................. 5-14
TABLE 511. SERIAL INTERFACE CONFIGURATION REGISTERS.............................................................. 5-15
TABLE 512. SERIAL INTERFACE CONTROL REGISTERS ........................................................................ 5-16
TABLE 513. PARALLEL INTERFACE CONFIGURATION REGISTERS......................................................... 5-22
TABLE 514. PARALLEL INTERFACE CONTROL REGISTERS .................................................................... 5-23
TABLE 515. DB-25 PARALLEL CONNECTOR PINOUT .......................................................................... 5-26
TABLE 516. 8042-TO-KEYBOARD COMMANDS .................................................................................. 5-28
TABLE 517. KEYBOARD/MOUSE INTERFACE CONFIGURATION REGISTERS ........................................... 5-29
TABLE 518. CPU COMMANDS TO THE 8042...................................................................................... 5-31
TABLE 519. KEYBOARD/POINTING DEVICE CONNECTOR PINOUT ........................................................ 5-33
TABLE 520. USB INTERFACE CONFIGURATION REGISTERS ................................................................. 5-34
TABLE 521. USB CONTROL REGISTERS............................................................................................. 5-35
TABLE 522. USB CONNECTOR PINOUT.............................................................................................. 5-35
TABLE 523. AUDIO MODE DIFFERENCES............................................................................................ 5-39
TABLE 524. AUDIO SUBSYSTEM I/O MAP .......................................................................................... 5-42
TABLE 525. COMPATIBILITY MODE AUDIO MIXER CONTROL REGISTER MAPPING ............................... 5-42
TABLE 526. EXTENDED MODE AUDIO MIXER CONTROL REGISTER MAPPING ...................................... 5-43
TABLE 527. FM SYNTHESIZER CONTROL REGISTER MAPPING ............................................................ 5-43
TABLE 528. AUDIO SUBSYSTEM SPECIFICATIONS ............................................................................... 5-44
TABLE 529. OPERATING SPECIFICATIONS........................................................................................... 5-47
TABLE 61. 2D GRAPHICS DISPLAY MODES (W/SGRAM)...................................................................... 6-4
TABLE 61. 3D GRAPHICS DISPLAY MODES .......................................................................................... 6-4
TABLE 61. ATI RAGE PRO PCI CONFIGURATION SPACE REGISTERS .................................................. 6-5
TABLE 61. STANDARD VGA MODE I/O MAPPING................................................................................ 6-5
TABLE 61. MONITOR POWER MANAGEMENT CONDITIONS.................................................................... 6-6
TABLE 61. DB-15 MONITOR CONNECTOR PINOUT ............................................................................... 6-7
TABLE 71. 90-WATT POWER SUPPLY ASSEMBLY SPECIFICATIONS ........................................................ 7-2
TABLE 81. DESKTOP MANAGEMENT FUNCTIONS (INT15) .................................................................... 8-4
TABLE 81. PNP BIOS FUNCTIONS..................................................................................................... 8-19
TABLE 82. APM BIOS FUNCTIONS (INT15) ..................................................................................... 8-23
TABLE A1. POWER-ON MESSAGES ..................................................................................................... A-1
TABLE A2. BEEP/KEYBOARD LED CODES.......................................................................................... A-1
TABLE A3. POWER-ON SELF TEST (POST) MESSAGES........................................................................ A-2
TABLE A4. PROCESSOR ERROR MESSAGES ......................................................................................... A-3
TABLE A5. MEMORY ERROR MESSAGES............................................................................................. A-4
TABLE A6. KEYBOARD ERROR MESSAGES.......................................................................................... A-4
TABLE A7. PRINTER ERROR MESSAGES.............................................................................................. A-5
TABLE A8. VIDEO (GRAPHICS) ERROR MESSAGES .............................................................................. A-5
TABLE A9. DISKETTE DRIVE ERROR MESSAGES.................................................................................. A-6
TABLE A10. SERIAL INTERFACE ERROR MESSAGES............................................................................. A-6
TABLE A11. SERIAL INTERFACE ERROR MESSAGES............................................................................. A-7
TABLE A12. HARD DRIVE ERROR MESSAGES...................................................................................... A-8
TABLE A13. HARD DRIVE ERROR MESSAGES...................................................................................... A-9
TABLE A14. HARD DRIVE MESSAGES ................................................................................................. A-9
TABLE A15. AUDIO ERROR MESSAGES............................................................................................. A-10
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Compaq Deskpro EN Series of Personal Computers
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Technical Reference Guide
TABLE A16. NETWORK INTERFACE ERROR MESSAGES ...................................................................... A-10
TABLE A17. SCSI INTERFACE ERROR MESSAGES ............................................................................. A-11
TABLE A18. POINTING DEVICE INTERFACE ERROR MESSAGES........................................................... A-11
TABLE A19. CEMM PRIVILEGED OPS ERROR MESSAGES.................................................................. A-12
TABLE A20. CEMM EXCEPTION ERROR MESSAGES ......................................................................... A-12
TABLE C1. KEYBOARD-TO-SYSTEM COMMANDS .................................................................................C-9
TABLE C2. KEYBOARD SCAN CODES.................................................................................................C-10
xii Compaq Deskpro EN Series of Personal Computers
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Third Edition - April 2000
Technical Reference Guide
Chapter 1
INTRODUCTION
1. Chapter 1 INTRODUCTION
1.1 ABOUT THIS GUIDE
This guide provides technical information about the Compaq Deskpro EN Series of Net PC and
Small Form Factor Personal Computers, including the Front-Mounted Audio Solution Series.
This document covers systems based on Intel Celeron, Pentium II, and Pentium III processors
using the Intel 440BX AGPset only. This document includes information regarding system
design, function, and features that can be used by programmers, engineers, technicians, and
system administrators.
This guide and any applicable addendums are available online at the following location:
http://www.compaq.com/support/techpubs/technical_reference_guides/index.html
1.1.1 USING THIS GUIDE
This guide consists of chapters and appendices. The chapters primarily describe the hardware
and firmware elements contained within the chassis and specifically deal with the system board
and the power supply assembly. The appendices contain general information about standard
peripheral devices such as the keyboard as well as separate audio or other interface cards, as well
as other general information in tabular format.
1.1.2 ADDITIONAL INFORMATION SOURCES
This guide does not describe in detail other manufacturer's components used in the product
covered. For more information on individual commercial-off-the-shelf (COTS) components refer
to the indicated manufacturers' documentation. The products covered by this guide use
architecture based on industry-standard specifications that can be referenced for detailed
information.
Hardcopy documentation sources:
The Lotus/Intel/Microsoft Expanded Memory Specification, Ver. 4.0
PCI Local Bus Specification Revision 2.1
Online information sources:
Compaq Computer Corporation: http://www.compaq.com
Intel Corporation: http://www.intel.com
National Semiconductor Incorporated: http://www.national.com
ATI Incorporated: http://www.atitech.com
1-1
Compaq Deskpro EN Series of Personal Computers
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Third Edition April 2000
Chapter 1 Introduction
1.2 NOTATIONAL CONVENTIONS
1.2.1 VALUES
Hexadecimal values are indicated by the letter "h" following an alpha-numerical value. Binary
values are indicated by the letter "b" following a value of ones and zeros. Memory addresses
expressed as "SSSS:OOOO" (SSSS = 16-bit segment, OOOO = 16-bit offset) can be assumed as
a hexadecimal value. Values that have no succeeding letter can be assumed to be decimal.
1.2.2 RANGES
Ranges or limits for a parameter are shown as a pair of values separated by two dots:
Example: Bits <7..4> = bits 7, 6, 5, and 4.
1.2.3 SIGNAL LABELS
Signal names are indicated using abbreviations, acronyms, or, if possible, the full signal name in
all capital letters. Signals that are meant to be active low are indicated with a dash immediately
following the name.
1.2.4 REGISTER NOTATION AND USAGE
This guide uses standard Intel naming conventions in discussing the microprocessor's (CPU)
internal registers. Registers that are accessed through programmable I/O using an indexing
scheme are indicated using the following format:
03C5.17h
Index port
Data port
In the example above, register 03C5.17h is accessed by writing the index port value 17h to the
index address (03C4h), followed by a write to or a read from port 03C5h.
1.2.5 BIT NOTATION
Bit values are labeled with bit <0> representing the least-significant bit (LSb) and bit <7>
representing the most-significant bit (MSb) of a byte. Bytes, words, double words, and quad
words are typically shown with most-significant portions on the left or top and the least-
significant portions on the right or bottom respectively.
1-2 Compaq Deskpro EN Series of Personal Computers
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Third Edition April 2000
Technical Reference Guide
1.3 COMMON ACRONYMS AND ABBREVIATIONS
Table 1-1 lists the acronyms and abbreviations used in this guide.
Table 11. Acronyms and Abbreviations
Table 1-1.
Acronyms and Abbreviations
Acronym/Abbreviation Description
A ampere
AC alternating current
ACPI Advanced Configuration and Power Interface
A/D analog-to-digital
AGP Accelerated graphics port
API application programming interface
APM advanced power management
ASIC application-specific integrated circuit
AT 1. attention (commands) 2. 286-based PC architecture
ATA AT attachment (mode)
AVI audio-video interleaved
AVGA Advanced VGA
BCD binary-coded decimal
BIOS basic input/output system
bis second/new revision
BitBLT bit block transfer
BNC Bayonet Neill-Concelman (connector)
bps or b/s bits per second
BSP Bootstrap processor
BTO Built to order
CAS column address strobe
CD compact disk
C D -R O M compact disk read-only memory
CDS compact disk system
CF carry flag
CG A color graphics adapter
Ch channel
CLUT color look-up table (pallete)
cm centimeter
CMC cache/memory controller
CMOS complimentary metal-oxide semiconductor (configuration memory)
Cntlr controller
Cntrl control
codec compressor/decompressor
CPQ Compaq
CPU central processing unit
CRT cathode ray tube
CSM Compaq system management / Compaq server management
CTO Configure to order
DAA direct access arrangement
DAC digital-to-analog converter
db decibel
DC direct current
DCH DOS compatibility hole
DDC Display Data Channel
DF direction flag
Continued
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Compaq Deskpro EN Series of Personal Computers
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Third Edition April 2000
Chapter 1 Introduction
Table 1-1. Acronyms and Abbreviations Continued
Acronym/Abbreviation Description
DIMM dual inline memory module
DIN Deutche IndustriNorm (connector standard)
DIP dual inline package
DMA direct memory access
DMI Desktop management interface
dpi dots per inch
DRAM dynamic random access memory
DRQ data request
EDID extended display identification data
EDO extended data out (RAM type)
EEPROM electrically eraseable PROM
EGA enhanced graphics adapter
EIA Electronic Industry Association
EISA extended ISA
EPP enhanced parallel port
EIDE enhanced IDE
ESCD Extended System Configuration Data (format)
EV Environmental Variable (data)
ExCA Exchangeable Card Architecture
FIFO first in / first out
FL flag (register)
FM frequency modulation
FPM fast page mode (RAM type)
FPU Floating point unit (numeric or math coprocessor)
FPS Frames per second
ft foot
GB gigabyte
G ND ground
GPIO general purpose I/O
GPOC general purpose open-collector
GART Graphics address re-mapping table
G UI graphics user interface
h hexadecimal
HW hardware
hex hexadecimal
Hz hertz
IDE integrated drive element
IEEE Institute of Electrical and Electronic Engineers
IF interrupt flag
I/F interface
in inch
INT interrupt
I/O input/output
IPL initial program loader
IrDA InfraRed Data Association
IRQ interrupt request
ISA industry standard architecture
JEDEC Joint Electron Device Engineering Council
Kb / KB kilobits / kilobytes (x 1024 bits / x 1024 bytes)
Kb/s kilobits per second
kg kilogram
KHz kilohertz
kv kilovolt
Continued
1-4 Compaq Deskpro EN Series of Personal Computers
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Third Edition April 2000
Technical Reference Guide
Table 1-1. Acronyms and Abbreviations Continued
Acronym/Abbreviation Description
lb pound
LAN local area network
LCD liquid crystal display
LED light-emitting diode
LIF low insertion force (socket)
LSI large scale integration
LSb / LSB least significant bit / least significant byte
LUN logical unit (SCSI)
MMX multimedia extensions
MPEG Motion Picture Experts Group
ms millisecond
MSb / MSB most significant bit / most significant byte
mux multiplex
MVA motion video acceleration
MVW motion video window
n variable parameter/value
NIC network interface card/controller
NiCad nickel cadmium
NiMH nickel-metal hydride
NMI non-maskable interrupt
ns nanosecond
NT nested task flag
NTSC National Television Standards Committee
NVRAM non-volatile random access memory
OEM original equipment manufacturer
OS operating system
PAL 1. programmable array logic 2. phase altering line
PC personal computer
PCI peripheral component interconnect
PCM pulse code modulation
PCMCIA Personal Computer Memory Card International Association
PF parity flag
PIN personal identification number
PIO Programmed I/O
POST power-on self test
PROM programmable read-only memory
PTR pointer
RAM random access memory
RAS row address strobe
rc v r receiver
RF resume flag
RG B red/green/blue (monitor input)
RH Relative humidity
RMS root mean square
RO M read-only memory
RPM revolutions per minute
RTC real time clock
R/W read/write
Continued
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Compaq Deskpro EN Series of Personal Computers
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Third Edition April 2000
Chapter 1 Introduction
Table 1-1. Acronyms and Abbreviations Continued
Acronym/Abbreviation Description
SCSI small computer system interface
SDRAM Synchronous Dynamic RAM
SEC Single Edge-Connector
SECAM sequential colour avec memoire (sequential color with memory)
SF sign flag
SGRAM Synchronous Graphics RAM
SIMM single in-line memory module
SIT system information table
SMART Self Monitor Analysis Report Technology
SMI system management interrupt
SMM system management mode
SMRAM system management RAM
SPD serial presence detect
SPP standard parallel port
SRAM static RAM
STN super twist pneumatic
SVGA super VGA
SW software
TAD telephone answering device
TAM telephone answering machine
TCP tape carrier package
TF trap flag
TFT thin-film transistor
TIA Telecommunications Information Administration
TPE twisted pair ethernet
TPI track per inch
TTL transistor-transistor logic
TV television
TX transmit
UART universal asynchronous receiver/transmitter
UDMA Ultra DMA
URL Uniform resource locator
us / s microsecond
USB Universal Serial Bus
UTP unshielded twisted pair
V volt
VESA Video Electronic Standards Association
VGA video graphics adapter
vib vibrato
VLSI very large scale integration
VRAM Video RAM
W watt
WOL Wake on LAN
WRAM Windows RAM
ZF zero flag
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