Compaq Deskpro User Manual [EN]
Technical
Reference
Guide
For the
Compaq Deskpro EN Series of Personal Computers
Desktop and Minitower Form Factors
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Technical Reference Guide
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Technical Reference Guide
Compaq Deskpro EN Series of Personal Computers, Desktop and Minitower Form Factors
Third Edition - Se ptember 1998
Documen t Number DSK-113C /0498
for
Compaq Deskpro EN Series of Personal Computers
Desktop and Minitower Form Factors
Third Edi tion - September 1998
i
Technical Reference Guide
ii
Compaq Deskpro EN Series of Personal Computers
Desktop and Minitower Form Factors
Third Edi tion–- September1998
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 NOT ATIONAL 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 C OMMON ACRONYMS AND ABBREVIATIONS..............................................................1-3
CHAPTER 2 SYSTE M OVERVIEW .....................................................................................................
2.1 INTRODUCTION..................................................................................................................2-1
2.2 FE ATURES 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 PROCE SSOR/ME MORY 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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Desktop and Minitower Form Factors
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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-T I ME C LOCK AND C ONFIGURATION MEMORY............................................... 4-29
4.7 I / O MAP AND REGI ST E R ACCESSING............................................................................ 4-46
4.7.1 SYSTEM I/O MAP ...................................................................................................... 4-46
4.7.2 GPIO UTILIZATION................................................................................................... 4-47
4.8 SYST EM 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 CONNECT OR ........................................................................................................ 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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Desktop and Minitower Form Factors
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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 C APABILIT IES PORT MODE...............................................................5-21
5.5.4 PARALLEL INTERFACE PROGRAMMING.............................................................. 5-22
5.5.5 PARALLEL INTERFACE CONNECT OR ................................................................... 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 CONNE C T OR................................ 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 FUNCTI ONAL DESC RIPT ION............................................................................................. 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 DIST RIBUTION.......................................................................
7.1 INTRODUCTION..................................................................................................................7-1
7.2 POWE R SUPPLY ASSEMBLY/CONTROL ..........................................................................7-1
7.2.1 POWER SUPPLY ASSE MB L Y.....................................................................................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 SI GNAL DIST RIBUTION.....................................................................................................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
Compaq Deskpro EN Series of Personal Computers
Desktop and Minitower Form Factors
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8.3 MEMORY DETECTION AND CONFIGURATION.............................................................. 8-3
8.4 DE SKTOP MANAGEMENT SUPPORT ............................................................................... 8-4
8.4.1 SYSTEM ID...................................................................................................................8-6
8.4.2 SYSTEM INFORMATION TABLE ............................................................................... 8-6
8.4.3 EDID RETRIEVE........................................................................................................8-13
8.4.4 DRIVE FAULT PREDICTION.....................................................................................8-13
8.4.5 SYSTEM MAP RETRIEVAL....................................................................................... 8-14
8.4.6 FLASH ROM FUNCTIONS......................................................................................... 8-15
8.4.7 POWER BUTTON FUNCTIONS................................................................................. 8-15
8.4.8 ACCESSING CMOS.................................................................................................... 8-16
8.4.9 ACCESSING CMOS FEATURE BITS......................................................................... 8-16
8.4.10 SECURITY FUNCTIONS............................................................................................ 8-18
8.5 PNP SUPPORT.................................................................................................................... 8-19
8.5.1 SMBIOS....................................................................................................................... 8-20
8.6 POWE R MANAGEME NT FUNCTI ONS ............................................................................ 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 (1
A.6 MEMORY ERROR MESSAGES (2
XX-XX
A.7 KEYBOARD ERROR MESSAGES (30
A.8 PRINTER ERROR MESSAGES (4
XX-XX
A.9 VIDEO (GRAPHICS) ERROR MESSAGES (5
A.10 DISKETTE DRIVE ERROR MESSAGES (6
A.11 SERIAL INTERFACE ERROR MESSAGES (11
A.12 MODEM COMMUNICATIONS ERROR MESSAGES (12
A.13 HARD DRIVE ERROR MESSAGES (17
A.14 HARD DRIVE ERROR MESSAGES (19
A.15 VIDEO (GRAPHICS) ERROR MESSAGES (24
A.16 AUDIO ERROR MESSAGES (3206A.17 NETWORK INTERFACE E RROR MESSAGES (60
A.18 SCSI INTERFACE E RROR MESSAGES (65
A.19 POINTING DEVICE INTERFACE ERROR MESSAGES (8601-
) ...................................................................... A-3
XX-XX
)........................................................................... A-4
)....................................................................... A-4
X-XX
)............................................................................ A-5
).......................................................... A-5
XX-XX
) ......................................................... A-6
XX-XX
)................................................... A-6
XX-XX
).................................... A-7
XX-XX
)............................................................... A-8
XX-XX
)............................................................... A-9
XX-XX
) .................................................... A-9
XX-XX
)......................................................................... A-10
XX
) ........................................... A-10
XX-XX
, 66XX-XX, 67XX-XX) ....................... A-11
XX-XX
).............................. A-11
XX
A.20 CEMM PRIVILEDGED OPS ERROR MESSAGES........................................................ A-12
A.21 CEMM EXCEPT I ON E RROR MESSAGES ................................................................... A-12
APPENDIX B ASCII CHARACTER SET .............................................................................................
B.1 INTRODUCTION..................................................................................................................B-1
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Desktop and Minitower Form Factors
Third Edi tion–- September1998
Technical Reference Guide
APPENDIX C KEYB O ARD ...................................................................................................................
C.1 INTRODUCTION..................................................................................................................C-1
C.2 KEYSTROKE PROCESSING................................................................................................C-2
C.2.1 TRANSMISSIONS TO THE SYSTEM ..........................................................................C-3
C.2.2 KEYBOARD LAYOUTS...............................................................................................C-4
C.2.3 KEYS .............................................................................................................................C-6
C.2.4 KEYBOARD COMMANDS...........................................................................................C-9
C.2.5 SCAN CODES...............................................................................................................C-9
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 ADAPTE R ........................................................................
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 CONT ROL ...............................................................F-6
F.6 CONNECTORS.....................................................................................................................F-6
F.6.1 MEMORY EXPANSI ON CONNECTOR.......................................................................F-6
F.6.2 MONIT OR CONNEC T OR............................................................................................. F-7
F.6.3 ATI MULTIMEDI A C HANNEL CONNEC T OR............................................................F-8
Compaq Deskpro EN Series of Personal Computers
Desktop and Minitower Form Factors
Third Edi tion - September 1998
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LIST OF FIGURES
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2–2. C
2–3. C
2–4. D
2–5. M
2–6. S
2–7. B
2–8. S
2–9. P
3–1. P
3–2. P
3–3. C
3–4. S
4–1. PCI B
4–2. PCI B
4–3. T
4–4. PCI C
OMPAQ DESKPRO
ABINET LAYOUTS
ABINET LAYOUTS
ESKTOP CHASSIS LAYOUT
INITOWER CHASSIS LAYOUT
YSTEM BOARD CONNECTOR AND SWITCH LOCATIONS
ACKLPANE BOARD CONNECTOR
YSTEM ARCHITECTURE
ROCESSOR PACKAGE COMPARISON
ROCESSOR/MEMORY SUBSYSTEM ARCHITECTURE
ENTIUM
ELERON PROCESSOR INTERNAL ARCHITECTURE
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US DEVICES AND FUNCTIONS
US CONNECTOR
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4–5. AGP 1X D
4–6. AGP 2X D
4–7. AGP B
4–8. ISA B
4–9. ISA E
4–10. M
4–11. C
US CONNECTOR
US BLOCK DIAGRAM
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ASKABLE INTERRUPT PROCESSING
ONFIGURATION MEMORY MAP
EN P
ERSONAL COMP UTER WITH MONITOR
, F
RONT VIEW
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, B
......................................................................................2-4
........................................................................................2-5
, T
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, L
LOCK DIAGRAM
..............................................................................2-6
EFT SIDE VIEW
, H
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...................................................................... 2-11
................................................................................ 2-12
II P
ROCESSOR INTERNAL ARCHITECTURE
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....................................................................................4-2
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).................................................................................4-3
........................................................................................4-6
......................................................................................4-7
ATA TRANSFER (PEAK TRANSFER RATE
ATA TRANSFER (PEAK TRANSFER RATE
...................................................................................................4-15
.............................................................................................4-16
..........................................................................................4-17
, B
LOCK DIAGRAM
.................................................................................... 4-29
...........................................2-1
................................................................2-7
......................................................2-8
................................2-9
............................................................3-2
............................................................3-3
...............................................................3-4
: 266 MB/S)........................................4-12
: 532 MB/S)........................................4-13
.................................................. 4-23
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5–1. 40-P
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5–2. 34-P
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5–3. S
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5–4. S
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5–5. P
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5–6. 8042-TO-K
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5–7. K
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5–8. U
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6–1. A
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6–2. A
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6–3. DAC O
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6–4. A
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6–5. FM S
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6–6. A
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7–1. P
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7–2. P
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7–3. L
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7–4. S
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7–5. B
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IDE C
IN
IN DISKETTE DRIVE CONNECTOR
ERIAL INTERFACES BLOCK DIAGRAM
ERIAL INTERFACE CONNECTOR (MALE
ARALLEL INTERFACE CONNECTOR (FEMALE
EYBOARD OR POINTING DEVICE INTERFACE CONNECTOR
NIVERSAL SERIAL BUS CONNECTOR (ONE OF TWO AS VIEWED FROM REAR OF CHASSIS
UDIO SUBSYSTEM BLOCK DIAGRAM
NALOG SIGNAL SAMPLING/QUANTIZING
UDIO SUBSYSTEM-TO
YNTHESIS PATCH
UDIO CAR-TO
OWER DISTRIBUTION AND CONTROL
OWER CABLE DIAGRAM
OW VOLTAGE SUPPLY
IGNAL DISTRIBUTION DIAGRAM
ACKPLANE HEADER PINOUTS
ONNECTOR
EYBOARD TRANSMISS I ON OF CODE EDH
PERATION
-ISA B
. ................................................................................................. 5-8
.............................................................................................................6-5
-ISA B
US
PCM A
......................................................................................................6-7
FM A
US
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..................................................................................................7-5
, B
LOCK DIAGRAM
.......................................................................................7-7
...........................................................................................7-8
Compaq Deskpro EN Series of Personal Computers
Desktop and Minitower Form Factors
.............................................................................. 5-13
............................................................................. 5-14
DB-9
AS VIEWED FROM REAR OF CHASSIS
DB-25
AS VIEWED FROM REAR OF CHASSIS
, T
IMING DIAGRAM
............................ 5-27
)...........5-14
).. 5-26
............................................... 5-33
).....5-35
................................................................................6-3
..........................................................................6-4
UDIO DATA FORMATS
/ B
YTE ORDERING
..............6-6
..........................................................6-7
, B
LOCK DIAGRAM
....................................................7-1
.........................................................................7-6
Third Edi tion–- September1998
Technical Reference Guide
F
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C–2. K
C–3. U.S. E
C–4. N
C–5. U.S. E
C–6. N
D–1. C
D–2. C
D–3. 82558 C
D–4. E
E–1. W
E–2. A
E–3. U
E–4. W
EYSTROKE PROCESSING ELEMENTS
EYBOARD-TO-SYSTEM TRANSMISS I ON OF CODE 58H
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NGLISH WINDOWS
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OMPAQ
OMPAQ
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IDE ULTRA
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SCSI C
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(101-KEY) K
(102-KEY) K
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10/100 TX PCI I
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TPE C
ONNECTOR
SCSI H
OST ADAPTER CARD LAYOUT
AHA-2940U U
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SCSI C
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F–1. ATI RAGE PRO AGP G
F–2. ATI RAGE PRO AGP G
F–3. ATI 3DR
F–4. VGA M
F–5. AMC C
AGE PRO GRAPHICS CONTROLLER INTERNAL ARCHITECTURE
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(101W-KEY) K
ONTROLLER CARD LAYOUT
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EYBOARD KEY POSITIONS
EYBOARD KEY POSITIONS
............................................................C-4
ONTROLLER CARD BLOCK DIAGRAM
............................................................... D-3
(RJ-45,
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...........................................................E-1
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....................................................C-2
, T
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..........................C-3
.......................................................C-4
...................................C-5
........................................C-5
(PCA# 323550-001)................. D-1
........... D-2
) ..................................... D-5
.............................E-2
)........................................E-5
).................................E-6
VERSION SHOWN
)...........................F-1
.................................................F-2
...............................F-3
)..............................F-7
Compaq Deskpro EN Series of Personal Computers
Desktop and Minitower Form Factors
Third Edi tion - September 1998
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Technical Reference Guide
T
1–1. A
ABLE
CRONYMS AND ABBREVIATIONS
LIST OF TABLES
.......................................................................................1-3
2–1. M
T
ABLE
2–2. S
T
ABLE
2–3. G
T
ABLE
2–4. E
T
ABLE
2–5. E
T
ABLE
2–6. P
T
ABLE
2–7. D
T
ABLE
2–8. 24X CD-ROM D
T
ABLE
2–9. H
T
ABLE
3–1. P
T
ABLE
3–2. BUS/C
T
ABLE
3–3. SPD A
T
ABLE
3–4. H
T
ABLE
4–1. PCI B
T
ABLE
4–2. PCI B
T
ABLE
4–3. PCI D
T
ABLE
4–4. PCI F
T
ABLE
4–5. PCI D
T
ABLE
4–6. PCI/ISA B
T
ABLE
4–7. PCI/AGP B
T
ABLE
4–8. AGP B
T
ABLE
4–9. ISA E
T
ABLE
4–10. D
T
ABLE
4–11. DMA P
T
ABLE
4–12. DMA C
T
ABLE
4–13. M
T
ABLE
4–14. M
T
ABLE
4–15. I
T
ABLE
4–16. I
T
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4–17. C
T
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4–18. C
T
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4–19. S
T
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4–20. 82371 S
T
ABLE
4–21. 82371 S
T
ABLE
4–22. 87307 I/O C
T
ABLE
4–23. S
T
ABLE
ODEL DIFFERENCES
UPPORT CHIPSETS
RAPHICS SUBSYSTEM COMPARISON
NVIRONMENTAL SPECIFICATIONS
LECTRICAL SPECIFICATIONS
HYSICAL SPECIFICATIONS
ISKETTE DRIVE SPECIFICATIONS
ARD DRIVE SPECIFICATIONS
ROCESSOR COMPARISON
ORE SPEED SWITCH SETTINGS
DDRESS MAP
/PCI B
OST
EFAULT
ASKABLE INTERRUPT PRIORITIES AND ASSIGNMENTS
ASKABLE INTERRUPT CONTROL REGISTERS
NTERVAL TIMER FUNCTIONS
NTERVAL TIMER CONTROL REGISTERS
LOCK GENERATION AND DISTRIBUTION
ONFIGURATION MEMORY
YSTEM
YSTEM MANAGEMENT CONTROL REGISTERS
RIDGE CONFIGURATION REGISTERS
US CONNECTOR PINOUT
US MASTERING DEVICES
EVICE CONFIGURATION ACCESS
UNCTION CONFIGURATION ACCES
EVICE IDENTIFICATION
RIDGE CONFIGURATION REGISTERS
RIDGE CONFIGURATION REGISTERS
US CONNECTOR PINOUT
XPANSION CONNECTOR PINOUT
DMA C
AGE REGISTER ADDRESSES
ONTROLLER REGISTERS
I/O MAP...........................................................................................................4-46
OUTH BRIDGE GENERAL PURPOSE INPUT PORT UTILIZATION
OUTH BRIDGE GENERAL PURPOSE OUTPUT PORT UTILIZATION
.......................................................................................................2-10
..........................................................................................................2-13
................................................................................ 2-14
.................................................................................... 2-15
...........................................................................................2-15
...............................................................................................2-15
..................................................................................... 2-16
RIVE SPECIFICATIONS
.............................................................................. 2-16
...........................................................................................2-17
...................................................................................................3-3
...................................................................................3-5
(SDRAM DIMM)...............................................................................3-7
(443BX, F
............................................................................................4-3
...........................................................................................4-4
................................................................................4-6
..............................................................................4-7
.............................................................................................4-8
(82371, F
(82371, F
....................................................................................... 4-15
............................................................................. 4-17
HANNEL ASSIGNMENTS
....................................................................... 4-20
................................................................................. 4-21
...................................................................................... 4-22
.................................................................. 4-24
.........................................................................................4-27
........................................................................... 4-27
........................................................................ 4-28
(CMOS) MAP....................................................................... 4-30
ONTROLLER PN
P S
TANDARD CONTROL REGISTERS
................................................................. 4-51
UNCTION
UNCTION
UNCTION
0) ............................... 3-9
0)................................. 4-10
1)...............................4-14
.................................................... 4-24
............................... 4-47
............................ 4-48
...................................... 4-49
5–1. IDE PCI C
T
ABLE
5–2. IDE B
T
ABLE
5–3. IDE ATA C
T
ABLE
5–4. IDE C
T
ABLE
5–5. 40-P
T
ABLE
5–6. D
T
ABLE
5–7. D
T
ABLE
5–8. 34-P
T
ABLE
x
Compaq Deskpro EN Series of Personal Computers
ISKETTE DRIVE CONTROLLER CONFIGURATION REGISTERS
ISKETTE DRIVE CONTROLLER REGISTERS
ONFIGURATION REGISTERS
US MASTER CONTROL REGISTERS
ONTROL REGISTERS
ONTROLLER COMMANDS
IDE C
IN
IN DISKETTE DRIVE CONNECTOR PINOUT
ONNECTOR PINOUT
.......................................................................................5-3
........................................................................................5-6
Desktop and Minitower Form Factors
Third Edi tion–- September1998
..............................................................................5-2
...........................................................................5-2
......................................................................................5-8
............................................ 5-10
...................................................................... 5-11
.................................................................. 5-13
T
5–9. DB-9 S
ABLE
5–10. S
T
ABLE
5–11. S
T
ABLE
5–12. P
T
ABLE
5–13. P
T
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5–14. DB-25 P
T
ABLE
5–15. 8042-TO-K
T
ABLE
5–16. K
T
ABLE
5–17. CPU C
T
ABLE
5–18. K
T
ABLE
5–19. USB I
T
ABLE
5–20. USB C
T
ABLE
5–21. USB C
T
ABLE
ERIAL CONNECTOR PINOUT
ERIAL INTERFACE CONFIGURATION REGISTERS
ERIAL INTERFACE CONTROL REGISTERS
ARALLEL INTERFACE CONFIGURATION REGISTERS
ARALLEL INTERFACE CONTROL REGISTERS
ARALLEL CONNECTOR PINOUT
EYBOARD COMMANDS
EYBOARD/MOUSE INTERFACE CONFIGURATION REGISTERS
OMMANDS TO THE
EYBOARD/POINTING DEVICE CONNECTOR PINOUT
NTERFACE CONFIGURATION REGISTERS
ONTROL REGISTERS
ONNECTOR PINOUT
8042...................................................................................... 5-31
..............................................................................................5-35
.................................................................................. 5-14
.............................................................. 5-15
........................................................................ 5-16
......................................................... 5-22
................................................................... 5-23
.......................................................................... 5-26
.................................................................................. 5-28
........................................................ 5-33
................................................................. 5-34
.............................................................................................5-35
Technical Reference Guide
........................................... 5-29
6–1. A
T
ABLE
6–2. A
T
ABLE
6–3. C
T
ABLE
6–4. E
T
ABLE
6–5. FM S
T
ABLE
6–6. A
T
ABLE
7–1. P
T
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8–1. D
T
ABLE
8–1. PNP BIOS F
T
ABLE
8–2. APM BIOS F
T
ABLE
A–1. P
T
ABLE
A–2. B
T
ABLE
A–3. P
T
ABLE
A–4. P
T
ABLE
A–5. M
T
ABLE
A–6. K
T
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A–7. P
T
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A–8. V
T
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A–9. D
T
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A–10. S
T
ABLE
A–11. S
T
ABLE
A–12. H
T
ABLE
A–13. H
T
ABLE
A–14. H
T
ABLE
A–15. A
T
ABLE
A–16. N
T
ABLE
A–17. SCSI I
T
ABLE
A–18. P
T
ABLE
A–19. CEMM P
T
ABLE
A–20. CEMM E
T
ABLE
UDIO MODE DIFFERENCES
UDIO SUBSYSTEM
OMPATIBILITY MODE AUDIO MIXER CONTROL REGISTER MAPPING
XTENDED MODE AUDIO MIXER CONTROL REGISTER MAPPING
YNTHESIZER CONTROL REGISTER MAPPING
UDIO SUBSYSTEM SPECIFICATIONS
OWER SUPPLY ASSEMBLY SPECIFICATIONS
ESKTOP MANAGEMENT FUNCTIONS
OWER-ON MESSAGES
EEP/KEYBOARD
OWER-ON SELF TEST
ROCESSOR ERROR MESSAGES
EMORY ERROR MESSAGES
EYBOARD ERROR MESSAGES
RINTER ERROR MESSAGES
IDEO (GRAPHICS
ISKETTE DRIVE ERROR MESSAGES
ERIAL INTERFACE ERROR MESSAGES
ERIAL INTERFACE ERROR MESSAGES
ARD DRIVE ERROR MESSAGES
ARD DRIVE ERROR MESSAGES
ARD DRIVE MESSAGES
UDIO ERROR MESSAGES
ETWORK INTERFACE ERROR MESSAGES
NTERFACE ERROR MESSAGES
OINTING DEVICE INTERFACE ERROR MESSAGES
RIVILEGED OPS ERROR MESSAGES
XCEPTION ERROR MESSAGES
I/O MAP..............................................................................................6-9
UNCTIONS
UNCTIONS
LED C
) E
...............................................................................................6-6
........................................ 6-10
.............................................................. 6-10
................................................................................. 6-11
........................................................................7-2
(INT15) .................................................................... 8-4
.....................................................................................................8-19
(INT15) ..................................................................................... 8-23
..................................................................................................... A-1
.......................................................................................... A-1
ODES
(POST) M
ESSAGES
........................................................................ A-2
......................................................................................... A-3
............................................................................................. A-4
.......................................................................................... A-4
.............................................................................................. A-5
RROR MESSAGES
.............................................................................. A-5
.................................................................................. A-6
............................................................................. A-6
............................................................................. A-7
...................................................................................... A-8
...................................................................................... A-9
................................................................................................. A-9
............................................................................................. A-10
...................................................................... A-10
............................................................................. A-11
........................................................... A-11
.................................................................. A-12
......................................................................... A-12
...................................6-9
T
ABLE
T
ABLE
T
ABLE
B–1. ASCII C
C–1. K
C–2. K
EYBOARD-TO-SYSTEM COMMANDS
EYBOARD SCAN CODES
HARACTER SET
....................................................................................................B-1
.................................................................................C-9
.................................................................................................C-10
Compaq Deskpro EN Series of Personal Computers
Desktop and Minitower Form Factors
Third Edi tion - September 1998
xi
Technical Reference Guide
T
D–1. O
ABLE
PERATING SPECIFICATIONS
............................................................................................. D-5
E–1. U
T
ABLE
E–2. U
T
ABLE
E–3. W
T
ABLE
E–4. SCSI C
T
ABLE
E–5. W
T
ABLE
F–1. 2D G
T
ABLE
F–2. 3D G
T
ABLE
F–3. ATI RAGE PRO PCI C
T
ABLE
F–4. S
T
ABLE
F–5. M
T
ABLE
F–6. DB-15 M
T
ABLE
F–7. M
T
ABLE
SCSI H
LTRA
SCSI H
LTRA
IDE ULTRA
IDE ULTRA
RAPHICS DISPLAY MODES (W
RAPHICS DISPLAY MODES
TANDARD
ONITOR POWER MANAGEMENT CONDITIONS
ULTIMEDIA INTERFACE CONNECTOR PINOUT
OST ADAPTER CARD CONTROL REGISTER MAPPING
OST ADAPTER CARD SPECIFICATIONS
SCSI A
ONNECTOR PINOUT
DAPTER CARD TYPICAL CONFIGURATION
................................................................................................E-5
SCSI C
ONNECTOR PINOUT
............................................................................E-6
/SGRAM)......................................................................F-4
..........................................................................................F-4
ONFIGURATION SPACE REGISTERS
VGA M
ODE
I/O M
................................................................................F-5
APPING
....................................................................F-6
ONITOR CONNECTOR PINOUT
...............................................................................F-7
...................................................................F-8
......................................E-3
...........................................................E-3
............................................E-4
..................................................F-5
xii
Compaq Deskpro EN Series of Personal Computers
Desktop and Minitower Form Factors
Third Edi tion–- September1998
Chapter 1
INTRODUCTION
1. Chapter 1 INTRODUCTION
Technical Reference Guide
1.1
ABOUT THIS G UIDE
This guide provides technical information about the Compaq Deskpro EN Series of Personal
Computers in desktop and minitower form factors. This document includes information
regarding system design, function, and features that can be used by programmers, engineers,
technicians, and system administrators.
This and other support documentation is available online and can be downloaded in .PDF format
from the following WEB site: http://www.compaq.com/support/index.htm.
1.1.1 USING THIS G U ID E
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
Compaq Deskpro EN Series of Personal Computers
Desktop and Minitower Form Factors
Third Edi tion - September 1998
1-1
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 lett er can be a s s u med 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 exam ple a bove , re gister 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 leastsignificant portions on the right or bottom respectively.
Compaq Deskpro EN Series of Personal Computers
1-2
Desktop and Minitower Form Factors
Third Edi tion – September 1998
1.3 COMM ON ACRONYMS AND ABBREVIATIONS
Table 1-1 lists the acronyms and abbreviations used in this guide.
Technical Reference Guide
Table 1–1.
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/out put system
bis second/new revision
BitBLT bit block transfer
BNC Bayonet Neill-Concelman (connector)
bps or b/s bits per second
BSP Bootstrap processor
BTO Built to order
CAS column address strobe
CD compact disk
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
Compaq Deskpro EN Series of Personal Computers
Desktop and Minitower Form Factors
Third Edi tion - September 1998
1-3
Chapter 1 Introduction
Table 1-1. Acronyms and Abbreviations
Acronym/Abbreviation Description
DIMM dual inline memory module
DIN Deutche IndustriNorm (connector standard)
DIP dual inline package
DMA direct mem ory acce ss
DMI Desktop management interface
dpi dots per inch
DRAM dynamic random access memory
DRQ data request
EDID extended display identification data
EDO extended data out (RAM type)
EEPROM electrically eraseable PROM
EGA enhanced graphics adapter
EIA Electronic Industry Association
EISA extended ISA
EPP enhanced parallel port
EIDE enhanced IDE
ESCD Extended System Configuration Data (format)
EV Environmental Variable (data)
ExCA Exchangeable Card Architecture
FIFO first in / first out
FL flag (register)
FM frequency modulation
FPM fast page mode (RAM type)
FPU Floating point unit (numeric or math coprocessor)
ft foot
GB gigabyte
GND ground
GPIO general purpose I/O
GPOC general purpose open-collector
GART Graphics address re-mapping table
GUI graphics user interface
h hexadecimal
HW hardware
hex hexadecimal
Hz hertz
IDE integrated drive element
IEEE Institute of Electrical and Electronic Engineers
IF interrupt flag
I/F interface
in inch
INT interrupt
I/O input/output
IPL initial program loader
IrDA Infra Red Data Association
IRQ interrupt request
ISA industry standard architecture
JEDEC Joint Electron Device Engineering Council
Kb / KB kilobits / kilobytes (x 1024 bits / x 1024 bytes)
Kb/s kilobits per second
kg kilogram
KHz kilohertz
kv kilovolt
Continued
Continued
Compaq Deskpro EN Series of Personal Computers
1-4
Desktop and Minitower Form Factors
Third Edi tion – September 1998
Technical Reference Guide
Table 1-1. Acronyms and Abbreviations
Acronym/Abbreviation Description
lb pound
LAN local area network
LCD liquid crystal display
LED light-emitting diode
LIF low insertion force (socket)
LSI large scale integration
LSb / LSB least significant bit / least significant byte
LUN logical unit (SCSI)
MMX multimedia extensions
MPEG Motion Picture Experts Group
ms millisecond
MSb / MSB most significant bit / most significant byte
mux multiplex
MVA motion video acceleration
MVW motion video window
n
NIC network interface card/controller
NiCad nickel cadmium
NiMH nickel-metal hydride
NMI non-maskable interrupt
ns nanosecond
NT nested task flag
NTSC National Television Standards Committee
NVRAM non-volatile random access memory
OEM original equipment manufacturer
OS operating system
PAL 1. programmable array logic 2. phase altering line
PC personal computer
PCI peripheral component interconnect
PCM pulse code modulation
PCMCIA Personal Computer Memory Card International Association
PF parity flag
PIN personal identification number
PIO Programmed I/O
POST power-on self test
PROM programmable read-only memory
PTR pointer
RAM random access memory
RAS row address strobe
rcvr receiver
RF resume flag
RGB red/green/blue (monitor input)
RH Relative humidity
RMS root mean square
ROM read-only memory
RPM revolutions per minute
RTC real time clock
R/W read/write
variable parameter/value
Continued
Continued
Compaq Deskpro EN Series of Personal Computers
Desktop and Minitower Form Factors
Third Edi tion - September 1998
1-5
Chapter 1 Introduction
Table 1-1. Acronyms and Abbreviations
Acronym/Abbreviation Description
SCSI small co mputer system in terface
SDRAM Synchronous Dynamic RAM
SEC Single Edge-Connector
SECAM sequential colour avec memoire (sequential color with memory)
SF sign flag
SGRAM Synchronous Graphics RAM
SIMM single in-line memory module
SIT system information ta ble
SMART Self Monitor Analysis Report Technology
SMI system management interrupt
SMM system management mode
SMRAM system m anagement RAM
SPD serial presence detect
SPP standard parallel port
SRAM static RAM
STN super twist pneumatic
SVGA super VGA
SW software
TAD telephone answering device
TAM telephone answering machine
TCP tape carrier package
TF trap flag
TFT thin-film transistor
TIA Telecommunications Information Administration
TPE twisted pair ethernet
TPI track per inch
TTl transistor-transistor logic
TV television
TX transmit
UART universal asynchronous receiver/transmitter
UDMA Ultra DMA
us / µs microsecond
USB Universal Serial Bus
UTP unshielded twisted pair
Vvolt
VESA Video Electronic Standards Association
VGA video graphics adapter
vib vibrato
VLSI very large scale integration
VRAM Video RAM
Wwatt
WOL Wake on LAN
WRAM Windows RAM
ZF zero flag
ZIF zero insertion force (socket)
Continued
Compaq Deskpro EN Series of Personal Computers
1-6
Desktop and Minitower Form Factors
Third Edi tion – September 1998
Chapter 2
SYSTEM OVERVIEW
Technical Reference Guide
2.
2.1
Chapter 2 SYSTEM O VERVIEW
INTRODUCTION
The Compaq Deskpro EN Series of desktop and minitower Personal Computers (Figure 2-1)
delivers an outstanding combination of manageability, serviceability, and consistency for
enterprise environments. Based on Intel Pentium II and Celeron processors, the Deskpro EN
Series emphasizes performance and industry compatibility. These models feature architectures
incorporating the PCI, AGP, and ISA buses. All m odels are easily upgradable and expan d a ble to
keep pa ce with the need s of t he office ent erpr ise.
Figure 2–1.
This chapter includes the following topics:
♦ Features and options (2.2) page 2-2
♦ Mechanical design (2.3) page 2-4
♦ System architectur e (2.4) page 2-8
♦ Specifications (2.5) page 2-13
Compaq Deskpro EN Series of Personal Computers
Desktop and Minitower Form Factors
Compaq Deskpro EN Desktop Personal Computers with Monitor
Third Edi tion - September 1998
2-1
Chapter 2 System Overview
2.2 FEATURES AND OPTIONS
This section describes the standard features and available options.
2.2.1 STANDARD FEATURES
The following standard features are included on all models:
♦ Pentium II or Celeron processor
♦ High-per form ance 2D/3D AGP graphics card
♦ Embedded 16-bit full-duplex audio with Compaq Premier Sound
♦ 3.5 inch, 1. 44-MB diskette drive
♦ Extended IDE controller support for up to four IDE drives
♦ Hard drive fault prediction
♦ Two serial interfaces
♦ Parallel interface
♦ Two universal serial bus ports
♦ Two PCI slots
♦ Two combo PCI/ISA s lots
♦ 10/100 NIC card
♦ Compaq Enhanced keyboard w/Windows support
♦ Mouse
♦ APM 1.2 power management support
♦ Plug ’n Play compatible (with ESCD support)
♦ Intelligent Manageability support
♦ Energy Star compliant
♦ Security features including:
• Flash ROM Boot Bl oc k
• Diskette drive disable, boot disable , write p rotec t
• Power-on password
• Administrator password
• QuickLock/QuickBlank
• Smart Cover lock
• Smart Cover removal sense
• Serial port disable
• Parallel port disable
Compaq Deskpro EN Series of Personal Computers
2-2
Desktop and Minitower Form Factors
Third Edi tion – September 1998
2.2.2 OPTIONS
The following items are available as options for all models and may be included in the standard
configuration of some models:
♦ System Memory: 16-MB DIMM (ECC and non-ECC)
♦ Hard drives/controllers: 3.2 GB UATA
♦ Removeable media drives:1.44 MB diskette drive
Technical Reference Guide
32-MB DIMM (ECC and non-ECC)
64-MB DIMM (ECC and nonECC)
128-MB DIMM (ECC and non-ECC)
4.3 GB Wide Ultra SCSI
9.1 GB Wide Ultra SCSI
Wide Ultra SCSI PCI controller
6.4 GB UATA
32x CD-ROM drive
PS-120 Power Drive
♦ Communications cards: Compaq 10/100TX PCI Intel with WOL UTP
Netelligent 10/100, TX PCI UTP TLAN
3COM Fast EtherLink XL 10/100TX PCI
Compaq Netelligent 56.6 Baud ISA Modem
♦ Graphics cards/memory: ATI RAGE PRO Turbo AGP card
ATI RAGE PRO Turbo AGP 2X card
4-MB SGRAM SODIMM (for RAGE PRO AGP 2X card)
Matrox MGA-G100A car d
Matrox Millennium G200-SD card
8-MB SDRAM SODIMM (for Millennium G200-SD card)
Compaq Deskpro Computers are easily upgraded and enh a nced with peripheral devices designed
to meet PCI and ISA standards. The Compaq Deskpro Personal Computers are compatible with
peripherals designed for Plug ’n Play operation.
Compaq Deskpro EN Series of Personal Computers
Desktop and Minitower Form Factors
Third Edi tion - September 1998
2-3
Chapter 2 System Overview
2.3 MECHANICAL DESIGN
The Compaq Deskpro EN Series uses a desktop form factor. This section illustrates the
mechanical particulars of the bezel, chassis, and major board assemblies.
2.3.1 CABINET LAYOUTS
1
2
3
4
31 52
6
7
5
6
7
Figure 2–2.
Desktop Minitower
Item Function
1 1.44 MB Diskette Drive (5.25” drive bay)
2 CD-ROM Drive (CDS models) (5.25“ drive bay)
3 Internal Drive (5.25”) bay
4 Internal Drive (3.5”) bay
5 Power Button
6 Power On/Sleep Indicator
7 Hard Drive Activity Indicator
Cabinet La youts, Front View
Compaq Deskpro EN Series of Personal Computers
2-4
Desktop and Minitower Form Factors
Third Edi tion – September 1998
Technical Reference Guide
2
1
3
7
8
11 13
94
10 12 14
15
17 18 19
2
1 16
3 5
6
Desktop
Item Function
1 AC Line In Connector
2 Smart Cover Lock Screws
3 Line Voltage Switch
4 USB Interface Port B
5 USB Interface Port A
6 100TX speed LED
7 Activity LED
8Link LED
9 NIC Connector
10 SCSI connector
11 Audio Headphone Input
12 Audio Microphone Input
13 Audio Line Output
14 Audio Line Input
15 Keyboard Connector
16 Mouse Connector
17 Parallel Interface Connector
18 Serial Interface Connector (COM1)
19 Serial Interface Connector (COM2)
20 Graphics Monitor Connector
20
11
13
15
17
18
19
5
7
4
6
8
9
10
12
14
16
20
Minitower
Figure 2–3. Cabinet Layouts, Rear View
Compaq Deskpro EN Series of Personal Computers
Desktop and Minitower Form Factors
Third Edi tion - September 1998
2-5
Chapter 2 System Overview
2.3.2 CHASSIS LAYOUTS
Figures 2-4 and 2-5 show the layout of key assemblies within the desktop and minitower chassis
respectively. For serviceability this system features an expansion card cage that allows easy
removal of the backplane and expansion cards as a single assembly. The tilt drive cage tilts up for
easy removal/replacement of drives. For detailed information on servicing the chassis refer to the
multimedia training CD-ROM and/or the maintenance and service guide for this system.
PCI Slot 4 (SCSI Card)
ISA Slot
PCI Slot 3
ISA Slot
PCI Slot 2
PCI Slot 1 (NIC Card)
Slots On Backplane,
Rear View
Back
Expansion Card Cage
AGP NLX
Graphics Card
Wide-Ultra
SCSI Card
System Board
Figure 2–4.
Speaker
Processor
Desktop Chassis Layout, Top View
Power Supply
Tilt Drive Cage
Chassi s Fan
Front
Compaq Deskpro EN Series of Personal Computers
2-6
Desktop and Minitower Form Factors
Third Edi tion – September 1998
Technical Reference Guide
ISA Slot
ISA Slot
PCI Slot 5
PCI Slot 4
PCI Slot 3
PCI Slot 1 (NIC Card)
Slots On Backplane,
Rear View @ 90
°
Wide-Ultra
SCSI Card
System Board
AGP NLX
Graphics Card
Power Supply
Drive Bays
Expansion Card Cage
Front
Back
Processor
Speaker
Figure 2–5. Minit ower Chassis Layout, Left Side View
Compaq Deskpro EN Series of Personal Computers
Desktop and Minitower Form Factors
Third Edi tion - September 1998
2-7
Chapter 2 System Overview
2.3.3 BOARD LAYOUTS
Figure 2-6 shows the location of connectors and switches for the system board, which is the same
for all models and both formfactors.
16
15
1 3
2
6 7
5
4
14
13
12
11
8
9
10
System Board (NLX-Type)
(P/N 007998-xxx
or 008123-xxx [1])
Item Function Item Function
1 Serial I/F (COM2) 7 (bottom) USB Port A I/F
2 Serial I/F (COM1) 8 Backplane Connector
3 Parallel I/F 9 Processor Slot 1
4 (top) Mouse connector 10 Heat Sink Thermal Diode Connector [2]
4 (bottom) Keyboard connector 11 DIMM Sockets
5 (top) Audio Line Input 12 Frequency/Password DIP Switch
5 (bottom) Audio Line Output 13 Heat Sink Thermal Diode Connector [3]
6 (top) Audio Mic Input 14 CMOS Clear Jumper
6 (bottom) Audio Headphone Output 15 AGP Slot (NLX-type)
7 (top) USB Port B I/F 16 Battery
NOTE:
[1] T he two system boards are electrically identical. There are slight differences in the location of some
components. Later production units use the 008123-xxx board.
[2] PCA # 008123
[3] PCA # 007998
Figure 2–6.
Compaq Deskpro EN Series of Personal Computers
2-8
System Board Connector and Switch Locations
Desktop and Minitower Form Factors
Third Edi tion – September 1998
Technical Reference Guide
Figure 2-7 shows the connector and switch locations for the two types of backplane boards.
1 3
2 8
4
5
6 7
9
10
11
1 2
7 3 5 9
4
6
11
1210
15
16
17
18 131415161718
System Board Side Power Supply Side
14
1312
Desktop Backplane Boar d
(P/N 008001-xxx
or 009663-xxx [5])
Item Function Item Function
1 PCI connector J20 (slot 1) 10 CD audio input header P7
2 PCI connector J21 (slot 2) 11 Secondary EIDE connector P21
3 ISA connector J10 [1] 12 Diskette drive connector P10
4 PCI connector J22 (slot 3) [2] 13 Primary EIDE connector P20
5 ISA connector J11 [3] 14 Power button/LED header P5
6 Smart Cover sensor switch 15 Fan header P8
7 PCI connector J23 (slot 4) [4] 16 Speaker header P6
8 PCI connector J24 (slot 5) 17 SCSI LED header P29
9 Power supply connector P1 18 NIC WOL header P9
NOTES:
[1] Shares slot with item 4 on desktop backplane (combo slot 1)
[2] Shares slot with item 3 on desktop backplane (combo slot 1)
[3] Shares slot with item 7 on desktop backplane (combo slot 2)
[4] Shares slot with item 5 on desktop backplane (combo slot 2)
[5] Later production units use the 009663-001 board
Figure 2–7. Backplane Board Connector, Header, and Switch Locations
Power Supply SideSystem Board Side
Minitower Backplane Boar d
(P/N 008058-xxx)
Compaq Deskpro EN Series of Personal Computers
Desktop and Minitower Form Factors
Third Edi tion - September 1998
2-9
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