Compaq Deskpro EP Series Personal Computers
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Deskpro EP Series Personal Computers TRG
Technical Reference Guide
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Technical Reference Guide
for
Compaq Deskpro EP Series Personal Computers
First Edition - April 1998
Document Number DSK-107A/0498
Compaq Deskpro EP Series Personal Computers i
First Edition April 1998
Technical Reference Guide
ii Compaq Deskpro EP Series Personal Computers
First Edition - April 1998
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 ........................................................................................................................... 2-2
2.2.1 STANDARD FEATURES .............................................................................................. 2-2
2.2.2 OPTIONS ....................................................................................................................... 2-2
2.3 MECHANICAL DESIGN ...................................................................................................... 2-3
2.3.1 CABINET LAYOUT...................................................................................................... 2-3
2.3.2 CHASSIS LAYOUT....................................................................................................... 2-4
2.3.3 SYSTEM BOARD LAYOUT ......................................................................................... 2-5
2.4 SYSTEM ARCHITECTURE.................................................................................................. 2-6
2.4.1 PROCESSOR ................................................................................................................. 2-8
2.4.2 MEMORY ...................................................................................................................... 2-8
2.4.3 SUPPORT CHIPSET ...................................................................................................... 2-9
2.4.4 MASS STORAGE .......................................................................................................... 2-9
2.4.5 SERIAL AND PARALLEL INTERFACES .................................................................... 2-9
2.4.6 UNIVERSAL SERIAL BUS INTERFACE ................................................................... 2-10
2.4.7 GRAPHICS SUBSYSTEM ........................................................................................... 2-10
2.5 SPECIFICATIONS .............................................................................................................. 2-11
CHAPTER 3 PROCESSOR/MEMORY SUBSYSTEM ........................................................................
3.1 INTRODUCTION .................................................................................................................. 3-1
66-MHZ SLOT 1 PROCESSOR/MEMORY SUBSYSTEM ................................................... 3-2
3.2
3.2.1 CELERON PROCESSOR............................................................................................... 3-3
3.2.2 PENTIUM II PROCESSOR............................................................................................ 3-3
3.2.3 PROCESSOR CHANGING/UPGRADING..................................................................... 3-4
3.2.4 SYSTEM MEMORY...................................................................................................... 3-5
3.2.5 SUBSYSTEM CONFIGURATION................................................................................. 3-8
100-MHZ SLOT 1 PROCESSOR/MEMORY SUBSYSTEM.................................................. 3-9
3.3
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3.3.1 PENTIUM II PROCESSOR.......................................................................................... 3-10
3.3.2 SYSTEM MEMORY.................................................................................................... 3-12
3.3.3 SUBSYSTEM CONFIGURATION............................................................................... 3-13
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
4.6.1 CONFIGURATION MEMORY BYTE DEFINITIONS ................................................ 4-30
4.7 I/O MAP AND REGISTER ACCESSING............................................................................ 4-46
4.7.1 SYSTEM I/O MAP ...................................................................................................... 4-46
4.7.2 82371 SOUTH BRIDGE GPIO CONFIGURATION ..................................................... 4-47
4.7.3 87309 I/O CONTROLLER CONFIGURATION ........................................................... 4-49
4.8 SYSTEM MANAGEMENT SUPPORT ............................................................................... 4-50
4.8.1 FLASH ROM WRITE PROTECT ................................................................................ 4-50
4.8.2 USER SECURITY........................................................................................................ 4-50
4.8.3 I/O SECURITY ............................................................................................................ 4-51
4.8.4 POWER MANAGEMENT ........................................................................................... 4-51
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 ........................................................................................................ 5-9
5.3 DISKETTE DRIVE INTERFACE........................................................................................ 5-10
5.3.1 DISKETTE DRIVE PROGRAMMING ........................................................................ 5-11
5.3.2 DISKETTE DRIVE CONNECTOR.............................................................................. 5-14
5.4 SERIAL INTERFACE ......................................................................................................... 5-15
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5.4.1 RS-232 INTERFACE ................................................................................................... 5-15
5.4.2 SERIAL INTERFACE PROGRAMMING .................................................................... 5-16
5.5 PARALLEL INTERFACE ................................................................................................... 5-21
5.5.1 STANDARD PARALLEL PORT MODE ..................................................................... 5-21
5.5.2 ENHANCED PARALLEL PORT MODE ..................................................................... 5-22
5.5.3 EXTENDED CAPABILITIES PORT MODE ............................................................... 5-22
5.5.4 PARALLEL INTERFACE PROGRAMMING .............................................................. 5-23
5.5.5 PARALLEL INTERFACE CONNECTOR ................................................................... 5-27
5.6 KEYBOARD/POINTING DEVICE INTERFACE ............................................................... 5-28
5.6.1 KEYBOARD INTERFACE OPERATION ................................................................... 5-28
5.6.2 POINTING DEVICE INTERFACE OPERATION ....................................................... 5-30
5.6.3 KEYBOARD/POINTING DEVICE INTERFACE PROGRAMMING ......................... 5-30
5.6.4 KEYBOARD/POINTING DFEVICE INTERFACE CONNECTOR.............................. 5-34
5.7 UNIVERSAL SERIAL BUS INTERFACE........................................................................... 5-35
5.7.1 USB KEYBOARD CONSIDERATIONS...................................................................... 5-35
5.7.2 USB CONFIGURATION.............................................................................................. 5-35
5.7.3 USB CONTROL........................................................................................................... 5-36
5.7.4 USB CONNECTOR ..................................................................................................... 5-36
CHAPTER 6 POWER AND SIGNAL DISTRIBUTION.......................................................................
6.1 INTRODUCTION .................................................................................................................. 6-1
6.2 POWER SUPPLY ASSEMBLY/CONTROL .......................................................................... 6-1
6.2.1 POWER SUPPLY ASSEMBLY...................................................................................... 6-2
6.2.2 POWER CONTROL....................................................................................................... 6-3
6.3 POWER DISTRIBUTION...................................................................................................... 6-5
6.3.1 3/5/12 VDC DISTRIBUTION......................................................................................... 6-5
6.3.2 LOW VOLTAGE DISTRIBUTION................................................................................ 6-6
6.4 GENERAL SIGNAL DISTRIBUTION .................................................................................. 6-7
CHAPTER 7 BIOS ROM .......................................................................................................................
7.1 INTRODUCTION .................................................................................................................. 7-1
7.2 BOOT FUNCTIONS.............................................................................................................. 7-2
7.2.1 BOOT BLOCK............................................................................................................... 7-2
7.2.2 QUICKBOOT................................................................................................................. 7-2
7.2.3 SILENTBOOT ............................................................................................................... 7-2
7.3 MEMORY DETECTION AND CONFIGURATION.............................................................. 7-3
7.4 CLIENT MANAGEMENT SUPPORT................................................................................... 7-4
7.4.1 SYSTEM ID/REVISION/SERIAL NO. .......................................................................... 7-6
7.4.2 SYSTEM INFORMATION TABLE ............................................................................... 7-6
7.4.3 EDID RETRIEVE ........................................................................................................ 7-12
7.4.4 DRIVE FAULT PREDICTION..................................................................................... 7-12
7.4.5 SYSTEM MAP RETRIEVAL....................................................................................... 7-13
7.4.6 FLASH ROM FUNCTIONS ......................................................................................... 7-14
7.4.7 POWER BUTTON FUNCTIONS ................................................................................. 7-14
7.4.8 ACCESSING CMOS.................................................................................................... 7-16
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7.4.9 ACCESSING CMOS FEATURE BITS......................................................................... 7-16
7.4.10 SECURITY FUNCTIONS ............................................................................................ 7-18
7.5 PNP SUPPORT .................................................................................................................... 7-19
7.5.1 SMBIOS ....................................................................................................................... 7-20
7.6 POWER MANAGEMENT FUNCTIONS ............................................................................ 7-21
7.6.1 INDEPENDENT PM SUPPORT .................................................................................. 7-21
7.6.2 ACPI SUPPORT........................................................................................................... 7-21
7.6.3 APM SUPPORT ........................................................................................................... 7-22
7.7 USB LEGACY SUPPORT ................................................................................................... 7-24
7.8 BIOS UPGRADING............................................................................................................. 7-24
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
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-7
C.2.4 KEYBOARD COMMANDS.........................................................................................C-10
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C.2.5 SCAN CODES ............................................................................................................. C-10
APPENDIX D AUDIO CARD.................................................................................................................
D.1 INTRODUCTION ................................................................................................................. D-1
D.2 FUNCTIONAL DESCRIPTION............................................................................................ D-2
D.2.1 PCM AUDIO PROCESSING......................................................................................... D-4
D.2.2 FM SYNTHESIS AUDIO PROCESSING...................................................................... D-7
D.3 AUDIO CARD PROGRAMMING ........................................................................................ D-8
D.3.1 CONFIGURATION ....................................................................................................... D-8
D.3.2 CONTROL .................................................................................................................... D-9
D.4 SPECIFICATIONS ............................................................................................................. D-11
APPENDIX E ATI RAGE IIC GRAPHICS CARD ...............................................................................
E.1 INTRODUCTION .................................................................................................................. E-1
E. 2 FUNCTIONAL DESCRIPTION.............................................................................................E-2
E.2.1 ATI RAGE IIC GRAPHICS CONTROLLER..................................................................E-3
E. 3 DISPLAY CONFIGURATIONS ............................................................................................ E-4
E. 4 PROGRAMMING.................................................................................................................. E-5
E.4.1 CONFIGURATION ........................................................................................................ E-5
E.4.2 CONTROL ..................................................................................................................... E-5
E. 5 POWER MANAGEMENT.....................................................................................................E-6
E.5.1 MONITOR CONTROL .................................................................................................. E-6
E.5.2 POWER CONSUMPTION ............................................................................................. E-6
E. 6 CONNECTORS ..................................................................................................................... E-7
E.6.2 MONITOR CONNECTOR.............................................................................................E-7
E.6.3 MULTIMEDIA INTERFACE CONNECTOR ................................................................ E-8
APPENDIX F ATI RAGE PRO AGP 1X GRAPHICS CARD ..............................................................
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 MULTIMEDIA INTERFACE CONNECTOR ................................................................ F-8
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APPENDIX G DIAMOND FIRE GRAPHICS CARD ...........................................................................
G.1 INTRODUCTION ................................................................................................................. G-1
G.2 FUNCTIONAL DESCRIPTION............................................................................................ G-2
G.2.1 SGS nVIDIA RIVA 128 GRAPHICS CONTROLLER................................................... G-3
G.3 DISPLAY MODES ............................................................................................................... G-4
G.4 PROGRAMMING................................................................................................................. G-5
G.4.1 CONFIGURATION ....................................................................................................... G-5
G.4.2 CONTROL .................................................................................................................... G-5
G.5 MONITOR POWER MANAGEMENT CONTROL .............................................................. G-6
G.6 CONNECTORS .................................................................................................................... G-6
G.6.1 MONITOR CONNECTOR............................................................................................ G-7
G.6.2 MEDIA PORT CONNECTOR ...................................................................................... G-8
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LIST OF FIGURES
FIGURE 21. COMPAQ DESKPRO EP PERSONAL COMPUTERS WITH MONITOR .......................................... 2-1
FIGURE 22. CABINET LAYOUT, FRONT VIEW ....................................................................................... 2-3
FIGURE 23. CABINET LAYOUT, REAR VIEW ......................................................................................... 2-3
FIGURE 24. CHASSIS LAYOUT, TOP VIEW ............................................................................................ 2-4
FIGURE 25. SYSTEM BOARD LAYOUT, COMPONENT SIDE ..................................................................... 2-5
FIGURE 26. SYSTEM ARCHITECTURE, BLOCK DIAGRAM ........................................................................ 2-7
FIGURE 27. PROCESSOR ARCHITECTURAL COMPARISON DIAGRAM........................................................ 2-8
FIGURE 31. 66-MHZ SLOT 1 PROCESSOR/MEMORY SUBSYSTEM ARCHITECTURE................................... 3-2
FIGURE 32. CELERON PROCESSOR INTERNAL ARCHITECTURE ............................................................... 3-3
FIGURE 33. PENTIUM II PROCESSOR INTERNAL ARCHITECTURE............................................................. 3-3
FIGURE 34. SYSTEM MEMORY MAP..................................................................................................... 3-7
FIGURE 35. 100-MHZ SLOT 1 PROCESSOR/MEMORY SUBSYSTEM ARCHITECTURE................................. 3-9
FIGURE 36. 350-/400-MHZ PENTIUM II PROCESSOR INTERNAL ARCHITECTURE .................................. 3-10
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. ................................................................................................. 5-9
FIGURE 52. 34-PIN DISKETTE DRIVE CONNECTOR.............................................................................. 5-14
FIGURE 53. SERIAL INTERFACE CONNECTOR (MALE DB-9 AS VIEWED FROM REAR OF CHASSIS) ........... 5-15
FIGURE 54. PARALLEL INTERFACE CONNECTOR (FEMALE DB-25 AS VIEWED FROM REAR OF CHASSIS) .. 5-27
FIGURE 55. 8042-TO-KEYBOARD TRANSMISSION OF CODE EDH, TIMING DIAGRAM............................ 5-28
FIGURE 56. KEYBOARD OR POINTING DEVICE INTERFACE CONNECTOR............................................... 5-34
FIGURE 57. UNIVERSAL SERIAL BUS CONNECTOR (ONE OF TWO AS VIEWED FROM REAR OF CHASSIS)..... 5-36
FIGURE 61. POWER SUPPLY ASSEMBLY AND ASSOCIATED CIRCUITRY, BLOCK DIAGRAM ....................... 6-1
FIGURE 62. POWER CABLE DIAGRAM .................................................................................................. 6-5
FIGURE 63. LOW VOLTAGE REGULATOR CIRCUITRY, BLOCK DIAGRAM ................................................. 6-6
FIGURE 64. GENERAL SIGNAL DISTRIBUTION, FUNCTIONAL BLOCK DIAGRAM....................................... 6-7
FIGURE 65. FRONT PANEL (BEZEL) CONTROL/INDICATOR CONNECTOR ................................................ 6-8
FIGURE 66. WAKE-ON-LAN NIC CONNECTOR.................................................................................... 6-8
FIGURE B1. ASCII CHARACTER SET ................................................................................................... B-1
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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 C7. U.S. ENGLISH WINDOWS (101WE-KEY) KEYBOARD KEY POSITIONS.................................C-6
FIGURE C8. NATIONAL WINDOWS (102WE-KEY) KEYBOARD KEY POSITIONS......................................C-6
FIGURE C9. SCANNER ELEMENTS, BLOCK DIAGRAM..........................................................................C-14
FIGURE C10. SCANNER OPERATION FLOW CHART ..............................................................................C-16
FIGURE D1. AUDIO CARD LAYOUT..................................................................................................... D-1
FIGURE D2. AUDIO CARD BLOCK DIAGRAM........................................................................................ D-3
FIGURE D3. ANALOG SIGNAL SAMPLING/QUANTIZING ........................................................................ D-4
FIGURE D4. DAC OPERATION ........................................................................................................... D-5
FIGURE D5. AUDIO CARD-TO-ISA BUS PCM AUDIO DATA FORMATS / BYTE ORDERING...................... D-6
FIGURE D6. FM SYNTHESIS PATCH.................................................................................................... D-7
FIGURE D7. AUDIO CAR-TO-ISA BUS FM AUDIO DATA FORMAT ........................................................ D-7
FIGURE E1. ATI RAGE IIC AGP GRAPHICS CARD LAYOUT (COMPAQ P/N 332836-001) ......................... 1
FIGURE E2. ATI RAGE IIC AGP GRAPHICS CARD BLOCK DIAGRAM ...................................................... 2
FIGURE E3. ATI 3D RAGE IIC GRAPHICS CONTROLLER INTERNAL ARCHITECTURE ............................... 3
FIGURE E4. VGA MONITOR CONNECTOR, (FEMALE DB-15, AS VIEWED FROM REAR). ................................ 7
FIGURE E5. MULTIMEDIA INTERFACE CONNECTOR (40-PIN HEADER P1).................................................. 8
FIGURE F1. ATI RAGE PRO AGP GRAPHICS CARD LAYOUT (P/N 008061-XXX) .................................... 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. MULTIMEDIA INTERFACE CONNECTOR (40-PIN HEADER P1)............................................... F-8
FIGURE G1. DIAMOND FIRE AGP GRAPHICS CARD LAYOUT................................................................. G-1
FIGURE G2. DIAMOND FIRE AGP GRAPHICS CARD BLOCK DIAGRAM ................................................... G-2
FIGURE G3. SGS NVIDIA RIVA 128 GRAPHICS CONTROLLER INTERNAL ARCHITECTURE................... G-3
FIGURE G4. VGA MONITOR CONNECTOR, (FEMALE DB-15, AS VIEWED FROM REAR). ........................... G-7
FIGURE G5. MEDIA PORT CONNECTOR (26-PIN HEADER P1) ............................................................... G-8
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LIST OF TABLES
TABLE 11. ACRONYMS AND ABBREVIATIONS....................................................................................... 1-3
TABLE 21. ARCHITECTURAL COMPARISON............................................................................................. 2-6
TABLE 22. SUPPORT CHIPSETS ............................................................................................................ 2-9
TABLE 23. GRAPHICS SUBSYSTEM COMPARISON ................................................................................ 2-10
TABLE 24. ENVIRONMENTAL SPECIFICATIONS.................................................................................... 2-11
TABLE 25. ELECTRICAL SPECIFICATIONS ........................................................................................... 2-11
TABLE 26. PHYSICAL SPECIFICATIONS ............................................................................................... 2-11
TABLE 27. DISKETTE DRIVE SPECIFICATIONS..................................................................................... 2-12
TABLE 28. 8X CD-ROM DRIVE SPECIFICATIONS................................................................................ 2-12
TABLE 29. HARD DRIVE SPECIFICATIONS........................................................................................... 2-13
TABLE 31. PROCESSOR/MEMORY ARCHITECTURAL COMPARISON ........................................................... 3-1
TABLE 32. PENTIUM II COVINGTON PROCESSOR BUS/CORE SPEED SWITCH SETTINGS....................... 3-4
TABLE 33. SPD ADDRESS MAP (SDRAM DIMM)................................................................................. 3-6
TABLE 34. HOST/PCI BRIDGE CONFIGURATION REGISTERS (443EX, FUNCTION 0) ................................ 3-8
TABLE 35. PENTIUM II MICROPROCESSOR BUS/CORE SPEED SWITCH SETTINGS .................................. 3-11
TABLE 36. HOST/PCI BRIDGE CONFIGURATION REGISTERS (443BX, FUNCTION 0) .............................. 3-13
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. 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. 87309 I/O CONTROLLER PNP STANDARD CONFIGURATION REGISTERS .............................. 4-49
TABLE 51. IDE PCI CONFIGURATION REGISTERS ................................................................................ 5-2
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TABLE 52. IDE BUS MASTER CONTROL REGISTERS ............................................................................. 5-3
TABLE 53. IDE ATA CONTROL REGISTERS......................................................................................... 5-4
TABLE 54. IDE CONTROLLER COMMANDS .......................................................................................... 5-7
TABLE 55. 40-PIN IDE CONNECTOR PINOUT ....................................................................................... 5-9
TABLE 56. DISKETTE DRIVE CONTROLLER CONFIGURATION REGISTERS ............................................. 5-11
TABLE 57. DISKETTE DRIVE CONTROLLER REGISTERS ....................................................................... 5-12
TABLE 58. 34-PIN DISKETTE DRIVE CONNECTOR PINOUT................................................................... 5-14
TABLE 59. DB-9 SERIAL CONNECTOR PINOUT................................................................................... 5-15
TABLE 510. SERIAL INTERFACE CONFIGURATION REGISTERS.............................................................. 5-16
TABLE 511. SERIAL INTERFACE CONTROL REGISTERS ........................................................................ 5-17
TABLE 512. PARALLEL INTERFACE CONFIGURATION REGISTERS......................................................... 5-23
TABLE 513. PARALLEL INTERFACE CONTROL REGISTERS ................................................................... 5-24
TABLE 514. DB-25 PARALLEL CONNECTOR PINOUT .......................................................................... 5-27
TABLE 515. 8042-TO-KEYBOARD COMMANDS .................................................................................. 5-29
TABLE 516. KEYBOARD/MOUSE INTERFACE CONFIGURATION REGISTERS ........................................... 5-30
TABLE 517. CPU COMMANDS TO THE 8042...................................................................................... 5-32
TABLE 518. KEYBOARD/POINTING DEVICE CONNECTOR PINOUT ........................................................ 5-34
TABLE 519. USB INTERFACE CONFIGURATION REGISTERS ................................................................. 5-35
TABLE 520. USB CONTROL REGISTERS............................................................................................. 5-36
TABLE 521. USB CONNECTOR PINOUT .............................................................................................. 5-36
TABLE 61. POWER SUPPLY ASSEMBLY SPECIFICATIONS........................................................................ 6-2
TABLE 71. PNP CLIENT MANAGEMENT FUNCTIONS (INT15)................................................................ 7-4
TABLE 72. PNP BIOS FUNCTIONS..................................................................................................... 7-19
TABLE 73. APM BIOS FUNCTIONS (INT15) ..................................................................................... 7-23
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
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TABLE C1. KEYBOARD-TO-SYSTEM COMMANDS ...............................................................................C-10
TABLE C2. KEYBOARD SCAN CODES.................................................................................................C-11
TABLE C3. SCANNER PERFORMANCE CHART .....................................................................................C-17
TABLE C4. SCANNER I/F SIGNALS.....................................................................................................C-18
TABLE C5. SCANNER SPECIFICATIONS ...............................................................................................C-20
TABLE D1. AUDIO MODE DIFFERENCES.............................................................................................. D-6
TABLE D2. AUDIO CARD I/O MAP ..................................................................................................... D-9
TABLE D3. COMPATIBILITY MODE AUDIO MIXER CONTROL REGISTER MAPPING ................................... D-9
TABLE D4. EXTENDED MODE AUDIO MIXER CONTROL REGISTER MAPPING ........................................ D-10
TABLE D5. FM SYNTHESIZER CONTROL REGISTER MAPPING .............................................................. D-10
TABLE D6. AUDIO CARD SPECIFICATIONS ........................................................................................ D-11
TABLE E1. 2D GRAPHICS DISPLAY MODES (W/EDO RAM) ...................................................................... 4
TABLE E2. 3D GRAPHICS DISPLAY MODES............................................................................................... 4
TABLE E3. ATI RAGE IIC PCI CONFIGURATION SPACE REGISTERS ....................................................... 5
TABLE E4. STANDARD VGA MODE I/O MAPPING .................................................................................. 5
TABLE E5. MONITOR POWER MANAGEMENT CONDITIONS ...................................................................... 6
TABLE E6. DB-15 MONITOR CONNECTOR PINOUT ................................................................................. 7
TABLE E7. MULTIMEDIA INTERFACE CONNECTOR PINOUT ...................................................................... 8
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
TABLE G1. 2D GRAPHICS DISPLAY MODES (W/SGRAM)...................................................................... G-4
TABLE G2. SGS NVIDA RIVA 128 PCI CONFIGURATION SPACE REGISTERS ...................................... G-5
TABLE G3. STANDARD VGA MODE I/O MAPPING .............................................................................. G-5
TABLE G4. MONITOR POWER MANAGEMENT CONDITIONS.................................................................. G-6
TABLE G5. DB-15 MONITOR CONNECTOR PINOUT ............................................................................. G-7
TABLE G6. MEDIA PORT CONNECTOR PINOUT.................................................................................... G-8
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xiv Compaq Deskpro EP Series Personal Computers
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Technical Reference Guide
Chapter 1
INTRODUCTION
1. Chapter 1 INTRODUCTION
1.1 ABOUT THIS GUIDE
This guide provides technical information about the Compaq Deskpro EP Series of Personal
Computers. This document includes information regarding system design, function, and features
that can be used by programmers, engineers, technicians, and system administrators.
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
AGP forum: http://www.agpforum.org/index.htm
ATI Incorporated: http://www.atitech.com
NVIDIA Corp.: http://www.nvidia.com
1-1
Compaq Deskpro EP Series of Personal Computers
First Edition - April 1998
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 EP Series of Personal Computers
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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
CAS column address strobe
CD compact disk
C D -R O M compact disk read-only memory
CDS compct 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
codec compressor/decompressor
C PQ Compaq
CPU central processing unit
CRT cathode ray tube
C SM Compaq system management / Compaq server management
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 EP Series of Personal Computers
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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
D R AM dynamic random access memory
DRQ data request
ECC error correction coding
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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