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Featuring Intel Celeron, Pentium II, and Pentium III Processors and the 440BX AGPset
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Technical Reference Guide
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Technical Reference Guide
for
Compaq Deskpro EN Series of Personal Computers, Desktop and Minitower Form Factors
Fifth Edition - April 2000
Document Number DSK-113E/0498
i
Compaq Deskpro EN Series of Personal Computers
Desktop and Minitower Form Factors
Fifth Edition - April 2000
Technical Reference Guide
ii Compaq Deskpro EN Series of Personal Computers
Desktop and Minitower Form Factors
Fifth 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 LAYOUTS ......................................................................................................... 2-6
2.3.3 BOARD LAYOUTS............................................................................................................ 2-8
2.4 SYSTEM ARCHITECTURE .................................................................................................... 2-10
2.4.1 PROCESSOR .................................................................................................................... 2-12
2.4.2 SYSTEM MEMORY......................................................................................................... 2-13
2.4.3 SUPPORT CHIPSET ........................................................................................................ 2-13
2.4.4 MASS STORAGE ............................................................................................................. 2-13
2.4.5 SERIAL AND PARALLEL INTERFACES...................................................................... 2-14
2.4.6 UNIVERSAL SERIAL BUS INTERFACE ...................................................................... 2-14
2.4.7 GRAPHICS SUBSYSTEM ............................................................................................... 2-14
2.4.8 AUDIO SUBSYSTEM...................................................................................................... 2-14
2.5 SPECIFICATIONS ................................................................................................................... 2-15
CHAPTER 3 PROCESSOR/MEMORY SUBSYSTEM .............................................................................
3.1 INTRODUCTION ....................................................................................................................... 3-1
3.2 PROCESSOR/MEMORY SUBSYSTEM .................................................................................. 3-2
3.2.1 PROCESSOR ...................................................................................................................... 3-3
3.2.2 PROCESSOR CHANGING/UPGRADING ........................................................................ 3-5
3.2.3 SYSTEM MEMORY........................................................................................................... 3-6
3.2.4 SUBSYSTEM CONFIGURATION .................................................................................... 3-9
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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
4.3.3 AGP CONNECTOR.......................................................................................................... 4-15
4.4 ISA BUS OVERVIEW.............................................................................................................. 4-16
4.4.1 ISA CONNECTOR ........................................................................................................... 4-17
4.4.2 ISA BUS TRANSACTIONS............................................................................................. 4-18
4.4.3 DIRECT MEMORY ACCESS .......................................................................................... 4-20
4.4.4 INTERRUPTS ................................................................................................................... 4-23
4.4.5 INTERVAL TIMER.......................................................................................................... 4-27
4.4.6 ISA CONFIGURATION ................................................................................................... 4-27
4.5 SYSTEM CLOCK DISTRIBUTION ........................................................................................ 4-28
4.6 REAL-TIME CLOCK AND CONFIGURATION MEMORY ................................................. 4-29
4.7 I/O MAP AND REGISTER ACCESSING................................................................................ 4-46
4.7.1 SYSTEM I/O MAP ........................................................................................................... 4-46
4.7.2 GPIO UTILIZATION........................................................................................................ 4-47
4.8 SYSTEM MANAGEMENT SUPPORT ................................................................................... 4-51
4.8.1 FLASH ROM WRITE PROTECT .................................................................................... 4-52
4.8.2 PASSWORD PROTECTION............................................................................................ 4-52
4.8.3 I/O SECURITY ................................................................................................................. 4-53
4.8.4 USER SECURITY............................................................................................................. 4-53
4.8.5 TEMPERATURE SENSING ............................................................................................ 4-54
4.8.6 SMART COVER LOCK ................................................................................................... 4-55
4.8.7 SMART COVER REMOVAL SENSOR .......................................................................... 4-55
4.8.8 POWER MANAGEMENT................................................................................................ 4-56
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 ............................................................................................................. 5-8
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
CHAPTER 6 AUDIO SUBSYSTEM ............................................................................................................
6.1 INTRODUCTION ....................................................................................................................... 6-1
6.2 FUNCTIONAL DESCRIPTION................................................................................................. 6-2
6.2.1 PCM AUDIO PROCESSING.............................................................................................. 6-4
6.2.2 FM SYNTHESIS AUDIO PROCESSING .......................................................................... 6-7
6.3 PROGRAMMING ....................................................................................................................... 6-8
6.3.1 CONFIGURATION ............................................................................................................ 6-8
6.3.2 CONTROL .......................................................................................................................... 6-9
6.4 SPECIFICATIONS ................................................................................................................... 6-11
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 3.5/5/12 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
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Technical Reference Guide
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
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
A.5 PROCESSOR ERROR MESSAGES (1XX-XX) ..........................................................................A-3
A.6 MEMORY ERROR MESSAGES (2XX-XX) ...............................................................................A-4
A.7 KEYBOARD ERROR MESSAGES (30X-XX) ...........................................................................A-4
A.8 PRINTER ERROR MESSAGES (4XX-XX).................................................................................A-5
A.9 VIDEO (GRAPHICS) ERROR MESSAGES (5XX-XX)..............................................................A-5
A.10 DISKETTE DRIVE ERROR MESSAGES (6XX-XX) .............................................................A-6
A.11 SERIAL INTERFACE ERROR MESSAGES (11XX-XX).......................................................A-6
A.12 MODEM COMMUNICATIONS ERROR MESSAGES (12XX-XX) ......................................A-7
A.13 HARD DRIVE ERROR MESSAGES (17XX-XX)...................................................................A-8
A.14 HARD DRIVE ERROR MESSAGES (19XX-XX)...................................................................A-9
A.15 VIDEO (GRAPHICS) ERROR MESSAGES (24XX-XX)........................................................A-9
A.16 AUDIO ERROR MESSAGES (3206-XX) .............................................................................A-10
A.17 NETWORK INTERFACE ERROR MESSAGES (60XX-XX) ..............................................A-10
A.18 SCSI INTERFACE ERROR MESSAGES (65XX-XX, 66XX-XX, 67XX-XX) .........................A-11
A.19 POINTING DEVICE INTERFACE ERROR MESSAGES (8601-XX).................................A-11
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
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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
APPENDIX D COMPAQ 10/100 TX PCI INTEL WOL UTP CONTROLLER CARD..........................
D.1 INTRODUCTION .......................................................................................................................D-1
D.2 FUNCTIONAL DESCRIPTION.................................................................................................D-2
D.2.1 STATUS INDICATORS .....................................................................................................D-2
D.2.2 CARD POWER AND CLOCK ...........................................................................................D-3
D.2.3 82558 CONTROLLER........................................................................................................D-3
D.2.4 POWER MANAGEMENT SUPPORT ...............................................................................D-4
D.3 CONFIGURATION/CONTROL.................................................................................................D-5
D.4 RJ-45 CONNECTOR ..................................................................................................................D-5
D.5 SPECIFICATIONS .....................................................................................................................D-5
APPENDIX E WIDE ULTRA SCSI HOST ADAPTER .............................................................................
E.1 INTRODUCTION ....................................................................................................................... E-1
E.2 FUNCTIONAL DESCRIPTION................................................................................................. E-2
E.3 SCSI ADAPTER PROGRAMMING .......................................................................................... E-3
E.3.1 SCSI ADAPTER CONFIGURATION................................................................................ E-3
E.3.2 SCSI ADAPTER CONTROL.............................................................................................. E-3
E.4 SPECIFCATIONS ....................................................................................................................... E-3
E.5 USER GUIDELINES .................................................................................................................. E-4
E.6 SCSI CONNECTORS ................................................................................................................. E-5
APPENDIX F ATI RAGE PRO AGP 1X/2X GRAPHICS CARDS...........................................................
F.1 INTRODUCTION ....................................................................................................................... F-1
F.2 FUNCTIONAL DESCRIPTION................................................................................................. F-2
F.2.1 ATI RAGE PRO TURBO AGP GRAPHICS CONTROLLER ........................................... F-3
F.3 DISPLAY MODES ..................................................................................................................... F-4
F.4 PROGRAMMING ....................................................................................................................... F-5
F.4.1 CONFIGURATION ............................................................................................................ F-5
F.4.2 CONTROL .......................................................................................................................... F-5
F.5 MONITOR POWER MANAGEMENT CONTROL .................................................................. F-6
F.6 CONNECTORS........................................................................................................................... F-6
F.6.1 MEMORY EXPANSION CONNECTOR........................................................................... F-6
F.6.2 MONITOR CONNECTOR ................................................................................................. F-7
F.6.3 ATI MULTIMEDIA CHANNEL CONNECTOR............................................................... F-8
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Technical Reference Guide
LIST OF FIGURES
FIGURE 21. COMPAQ DESKPRO EN PERSONAL COMPUTER WITH MONITOR............................................. 2-1
FIGURE 22. CABINET LAYOUTS, FRONT VIEW.......................................................................................... 2-4
FIGURE 23. CABINET LAYOUTS, REAR VIEW............................................................................................ 2-5
FIGURE 24. DESKTOP CHASSIS LAYOUT, TOP VIEW ................................................................................. 2-6
FIGURE 25. MINITOWER CHASSIS LAYOUT, LEFT SIDE VIEW ................................................................... 2-7
FIGURE 26. SYSTEM BOARD CONNECTOR AND SWITCH LOCATIONS ........................................................ 2-8
FIGURE 27. BACKLPANE BOARD CONNECTOR, HEADER, AND SWITCH LOCATIONS ................................. 2-9
FIGURE 28. SYSTEM ARCHITECTURE, BLOCK DIAGRAM ......................................................................... 2-11
FIGURE 29. PROCESSOR PACKAGE COMPARISON ................................................................................... 2-12
FIGURE 31. PROCESSOR/MEMORY SUBSYSTEM ARCHITECTURE .............................................................. 3-2
FIGURE 32. CELERON PROCESSOR INTERNAL ARCHITECTURE ................................................................. 3-3
FIGURE 33. PENTIUM II AND PENTIUM III PROCESSOR INTERNAL ARCHITECTURE................................... 3-4
FIGURE 34. SYSTEM MEMORY MAP ......................................................................................................... 3-8
FIGURE 41. PCI BUS DEVICES AND FUNCTIONS ....................................................................................... 4-2
FIGURE 42. PCI BUS CONNECTOR (32-BIT 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. AGP BUS CONNECTOR ........................................................................................................ 4-15
FIGURE 48. ISA BUS BLOCK DIAGRAM................................................................................................. 4-16
FIGURE 49. ISA EXPANSION CONNECTOR .............................................................................................. 4-17
FIGURE 410. MASKABLE INTERRUPT PROCESSING, BLOCK DIAGRAM.................................................... 4-23
FIGURE 411. CONFIGURATION MEMORY MAP........................................................................................ 4-29
FIGURE 51. 40-PIN IDE CONNECTOR. ...................................................................................................... 5-8
FIGURE 52. 34-PIN DISKETTE DRIVE CONNECTOR. ................................................................................ 5-13
FIGURE 53. SERIAL INTERFACES BLOCK DIAGRAM ................................................................................ 5-14
FIGURE 54. SERIAL INTERFACE CONNECTOR (MALE DB-9 AS VIEWED FROM REAR OF CHASSIS) .......... 5-14
FIGURE 55. PARALLEL INTERFACE CONNECTOR (FEMALE DB-25 AS VIEWED FROM REAR OF CHASSIS). 5-26
FIGURE 56. 8042-TO-KEYBOARD TRANSMISSION OF CODE EDH, TIMING DIAGRAM ............................. 5-27
FIGURE 57. KEYBOARD OR POINTING DEVICE INTERFACE CONNECTOR................................................. 5-33
FIGURE 58. UNIVERSAL SERIAL BUS CONNECTOR (ONE OF TWO AS VIEWED FROM REAR OF CHASSIS) ... 5-35
FIGURE 61. AUDIO SUBSYSTEM BLOCK DIAGRAM ................................................................................... 6-3
FIGURE 62. ANALOG SIGNAL SAMPLING/QUANTIZING.............................................................................. 6-4
FIGURE 63. DAC OPERATION................................................................................................................... 6-5
FIGURE 64. AUDIO SUBSYSTEM-TO-ISA BUS PCM AUDIO DATA FORMATS / BYTE ORDERING .............. 6-6
FIGURE 65. FM SYNTHESIS PATCH........................................................................................................... 6-7
FIGURE 66. AUDIO CAR-TO-ISA BUS FM AUDIO DATA FORMAT ............................................................ 6-7
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 ........................................................................................... 7-7
FIGURE 75. BACKPLANE HEADER PINOUTS .............................................................................................. 7-8
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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
FIGURE D1. COMPAQ 10/100 TX WOL CONTROLLER CARD LAYOUT (PCA# 323550-001) ...................D-1
FIGURE D2. COMPAQ 10/100 TX PCI INTEL WOL UTP CONTROLLER CARD BLOCK DIAGRAM ............D-2
FIGURE D3. 82558 CONTROLLER INTERNAL ARCHITECTURE...................................................................D-3
FIGURE D4. ETHERNET TPE CONNECTOR (RJ-45, VIEWED FROM CARD EDGE)........................................D-5
FIGURE E1. WIDE ULTRA SCSI HOST ADAPTER CARD LAYOUT.............................................................. E-1
FIGURE E2. ADAPTEC AHA-2940U ULTRA SCSI ADAPTER CARD BLOCK DIAGRAM.............................. E-2
FIGURE E3. ULTRA SCSI CONNECTOR (50-PIN, AS SEEN FROM REAR OF CARD)......................................... E-5
FIGURE E4. WIDE ULTRA SCSI CONNECTOR (68-PIN, AS SEEN FROM TOP OF CARD) ................................. E-6
FIGURE F1. ATI RAGE PRO AGP GRAPHICS CARD LAYOUT (NLX VERSION SHOWN) ............................ F-1
FIGURE F2. ATI RAGE PRO AGP GRAPHICS CARD BLOCK DIAGRAM ................................................... F-2
FIGURE F3. ATI 3DRAGE PRO GRAPHICS CONTROLLER INTERNAL ARCHITECTURE................................ F-3
FIGURE F4. VGA MONITOR CONNECTOR, (FEMALE DB-15, AS VIEWED FROM REAR)............................... F-7
FIGURE F5. AMC CONNECTOR (40-PIN HEADER P1)............................................................................... F-8
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Technical Reference Guide
LIST OF TABLES
TABLE 11. ACRONYMS AND ABBREVIATIONS .......................................................................................... 1-3
TABLE 21. MODEL DIFFERENCES ........................................................................................................... 2-10
TABLE 22. SUPPORT CHIPSETS ............................................................................................................... 2-13
TABLE 23. GRAPHICS SUBSYSTEM COMPARISON ................................................................................... 2-14
TABLE 24. ENVIRONMENTAL SPECIFICATIONS........................................................................................ 2-15
TABLE 25. ELECTRICAL SPECIFICATIONS................................................................................................ 2-15
TABLE 26. PHYSICAL SPECIFICATIONS.................................................................................................... 2-15
TABLE 27. DISKETTE DRIVE SPECIFICATIONS......................................................................................... 2-16
TABLE 28. 24X CD-ROM DRIVE SPECIFICATIONS ................................................................................. 2-16
TABLE 29. HARD DRIVE SPECIFICATIONS............................................................................................... 2-17
TABLE 31. PROCESSOR COMPARISON....................................................................................................... 3-3
TABLE 32. BUS/CORE SPEED SWITCH SETTINGS ...................................................................................... 3-5
TABLE 33. SPD ADDRESS MAP (SDRAM DIMM) .................................................................................. 3-7
TABLE 34. HOST/PCI BRIDGE CONFIGURATION REGISTERS (443BX, FUNCTION 0)................................. 3-9
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 ACCESS ............................................................................... 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. AGP BUS CONNECTOR PINOUT ........................................................................................... 4-15
TABLE 49. ISA EXPANSION CONNECTOR PINOUT ................................................................................ 4-17
TABLE 410. DEFAULT DMA CHANNEL ASSIGNMENTS........................................................................... 4-20
TABLE 411. DMA PAGE REGISTER ADDRESSES..................................................................................... 4-21
TABLE 412. DMA CONTROLLER REGISTERS.......................................................................................... 4-22
TABLE 413. MASKABLE INTERRUPT PRIORITIES AND ASSIGNMENTS...................................................... 4-24
TABLE 414. MASKABLE INTERRUPT CONTROL REGISTERS..................................................................... 4-24
TABLE 415. INTERVAL TIMER FUNCTIONS ............................................................................................. 4-27
TABLE 416. INTERVAL TIMER CONTROL REGISTERS.............................................................................. 4-27
TABLE 417. CLOCK GENERATION AND DISTRIBUTION............................................................................ 4-28
TABLE 418. CONFIGURATION MEMORY (CMOS) MAP .......................................................................... 4-30
TABLE 419. SYSTEM I/O MAP................................................................................................................ 4-46
TABLE 420. 82371 SOUTH BRIDGE GENERAL PURPOSE INPUT PORT UTILIZATION ................................ 4-47
TABLE 421. 82371 SOUTH BRIDGE GENERAL PURPOSE OUTPUT PORT UTILIZATION............................. 4-48
TABLE 422. 87307 I/O CONTROLLER PNP STANDARD CONTROL REGISTERS ........................................ 4-49
TABLE 423. SYSTEM MANAGEMENT CONTROL REGISTERS.................................................................... 4-51
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 .......................................................................................... 5-8
TABLE 56. DISKETTE DRIVE CONTROLLER CONFIGURATION REGISTERS............................................... 5-10
TABLE 57. DISKETTE DRIVE CONTROLLER REGISTERS.......................................................................... 5-11
TABLE 58. 34-PIN DISKETTE DRIVE CONNECTOR PINOUT..................................................................... 5-13
TABLE 59. DB-9 SERIAL CONNECTOR PINOUT...................................................................................... 5-14
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Technical Reference Guide
TABLE 510. SERIAL INTERFACE CONFIGURATION REGISTERS ................................................................ 5-15
TABLE 511. SERIAL INTERFACE CONTROL REGISTERS ........................................................................... 5-16
TABLE 512. PARALLEL INTERFACE CONFIGURATION REGISTERS ........................................................... 5-22
TABLE 513. PARALLEL INTERFACE CONTROL REGISTERS ...................................................................... 5-23
TABLE 514. DB-25 PARALLEL CONNECTOR PINOUT.............................................................................. 5-26
TABLE 515. 8042-TO-KEYBOARD COMMANDS...................................................................................... 5-28
TABLE 516. KEYBOARD/MOUSE INTERFACE CONFIGURATION REGISTERS............................................. 5-29
TABLE 517. CPU COMMANDS TO THE 8042.......................................................................................... 5-31
TABLE 518. KEYBOARD/POINTING DEVICE CONNECTOR PINOUT .......................................................... 5-33
TABLE 519. USB INTERFACE CONFIGURATION REGISTERS.................................................................... 5-34
TABLE 520. USB CONTROL REGISTERS ................................................................................................. 5-35
TABLE 521. USB CONNECTOR PINOUT.................................................................................................. 5-35
TABLE 61. AUDIO MODE DIFFERENCES.................................................................................................... 6-6
TABLE 62. AUDIO SUBSYSTEM I/O MAP .................................................................................................. 6-9
TABLE 63. COMPATIBILITY MODE AUDIO MIXER CONTROL REGISTER MAPPING..................................... 6-9
TABLE 64. EXTENDED MODE AUDIO MIXER CONTROL REGISTER MAPPING.......................................... 6-10
TABLE 65. FM SYNTHESIZER CONTROL REGISTER MAPPING................................................................. 6-10
TABLE 66. AUDIO SUBSYSTEM SPECIFICATIONS..................................................................................... 6-11
TABLE 71. 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
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 B1. ASCII CHARACTER SET.........................................................................................................B-1
TABLE C1. KEYBOARD-TO-SYSTEM COMMANDS.....................................................................................C-9
TABLE C2. KEYBOARD SCAN CODES ..................................................................................................... C-10
xi
Compaq Deskpro EN Series of Personal Computers
Desktop and Minitower Form Factors
Fifth Edition - April 2000
Technical Reference Guide
TABLE D1. OPERATING SPECIFICATIONS ..................................................................................................D-5
TABLE E1. ULTRA SCSI HOST ADAPTER CARD CONTROL REGISTER MAPPING........................................ E-3
TABLE E2. ULTRA SCSI HOST ADAPTER CARD SPECIFICATIONS ............................................................. E-3
TABLE E3. WIDE ULTRA SCSI ADAPTER CARD TYPICAL CONFIGURATION .............................................. E-4
TABLE E4. SCSI CONNECTOR PINOUT..................................................................................................... E-5
TABLE E5. WIDE ULTRA SCSI CONNECTOR PINOUT ............................................................................... E-6
TABLE F1. 2D GRAPHICS DISPLAY MODES (W/SGRAM) ........................................................................ F-4
TABLE F2. 3D GRAPHICS DISPLAY MODES .............................................................................................. F-4
TABLE F3. ATI RAGE PRO PCI CONFIGURATION SPACE REGISTERS..................................................... F-5
TABLE F4. STANDARD VGA MODE I/O MAPPING ................................................................................... F-5
TABLE F5. MONITOR POWER MANAGEMENT CONDITIONS....................................................................... F-6
TABLE F6. DB-15 MONITOR CONNECTOR PINOUT .................................................................................. F-7
TABLE F7. MULTIMEDIA INTERFACE CONNECTOR PINOUT ...................................................................... F-8
xii Compaq Deskpro EN Series of Personal Computers
Desktop and Minitower Form Factors
Fifth 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 Personal
Computers in desktop and minitower form factors, specifically models featuring Intel Celeron,
Pentium II, and Pentium III processors using the Intel 440BX AGPset. 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 and can be downloaded in .PDF
format from the following WEB site:
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
Desktop and Minitower Form Factors
Fifth 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
Desktop and Minitower Form Factors
Fifth 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
A TA 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
B TO Built to order
CAS column address strobe
CD compact disk
CD-ROM compact disk read-only memory
CDS compct disk system
CF carry flag
CGA 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
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
1-3
Compaq Deskpro EN Series of Personal Computers
Desktop and Minitower Form Factors
Fifth 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)
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