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Technical
Reference
Guide
for
Compaq Deskpro 4000 and 6000 Personal Computers
featuring the Pentium II Processor
The hardcopy of this document is designed to be placed into a standard 3-ring binder. Provided below is a
title block that can be copied and cut out and placed into the slip or taped onto the edge of the binder.
Deskpro 4000 and 6000 Personal Computers
featurin
g
the Pentium II Processor
TRG
Technical Reference Guide
Compaq Deskpro 4000 and 6000 Personal Computers
featuring the Pentium II Processor
First Edition โ October1997
i
NOTICE
The information in this document is subject to change without notice.
COMPAQ COMPUTER CORPORATION SHALL NOT BE LIABLE FOR TECHNICAL OR
EDITORIAL ERRORS OR OMISSIONS HEREIN; NOR FOR INCIDENTAL OR
CONSEQUENTIAL DAMAGES RESULTING FROM THE FURNISHING, PERFORMANCE,
OR USE OF THIS MATERIAL. IT IS THE RESPONSIBILITY OF MANUFACTURERS TO
ENSURE THAT DEVICES DESIGNED TO BE USED WITH COMPAQ PRODUCTS
COMPLY WITH FCC CLASS B EMISSIONS REQUIREMENTS.
This guide contains information protected by copyright. No part of this document may be
photocopied or reproduced in any form without prior written consent from Compaq Computer
Corporation.
๏
1997 Compaq Computer Corporation
All rights reserved. Printed in the USA
Compaq, Deskpro, LTE, Contura, Presario, ProLinea
Registered U.S. Patent and Trademark Office
Product names mentioned in this document may be trademarks and/or registered trademarks of other companies.
For more information regarding specifications and Compaq-specific parts please contact Compaq
Computer Corporation, Industry Relations Department.
Technical Reference Guide
for
Compaq Deskpro 4000 and 6000 Personal Computers featuring the Pentium II Processor
First Edition - October 1997
Document Number DSK-113A/1097
Technical Reference Guide
Compaq Deskpro 4000 and 6000 Personal Computers
featuring the Pentium II Processor
First Edition โ- October1997
ii
Technical Reference Guide
Compaq Deskpro 4000 and 6000 Personal Computers
featuring the Pentium II Processor
First Edition โ October1997
iii
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 SERIES DIFFERENCES................................................................................................ 2-3
2.2.3 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 SYSTEM BOARD LAYOUTS.......................................................................................2-7
2.4 SYSTEM ARCHITECTURE..................................................................................................2-8
2.4.1 PENTIUM II PROCESSOR.......................................................................................... 2-10
2.4.2 MEMORY....................................................................................................................2-10
2.4.3 SUPPORT CHIPSET.................................................................................................... 2-11
2.4.4 NETWORK INTERFACE............................................................................................2-11
2.4.5 GRAPHICS SUBSYSTEM........................................................................................... 2-12
2.4.6 MASS STORAGE........................................................................................................2-12
2.4.7 SERIAL AND PARALLEL INTERFACES .................................................................. 2-12
2.4.8 UNIVERSAL SERIAL BUS INTERFACE................................................................... 2-13
2.5 SPECIFICATIONS..............................................................................................................2-14
CHAPTER 3 PROCESSOR/MEMORY SUBSYSTEM........................................................................
3.1 INTRODUCTION.................................................................................................................. 3-1
3.2 PENTIUM II-BASED PROCESSOR/MEMORY SUBSYSTEM ...........................................3-2
3.2.1 PENTIUM II PROCESSOR............................................................................................ 3-3
3.2.2 SYSTEM MEMORY......................................................................................................3-6
3.2.3 SUBSYSTEM CONFIGURATION............................................................................... 3-10
Technical Reference Guide
Compaq Deskpro 4000 and 6000 Personal Computers
featuring the Pentium II Processor
First Edition โ- October1997
iv
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 CONFIGURATION............................................................................................... 4-10
4.3 AGP BUS OVERVIEW ....................................................................................................... 4-11
4.3.1 AGP CONFIGURATION............................................................................................. 4-12
4.4 ISA BUS OVERVIEW......................................................................................................... 4-13
4.4.1 ISA CONNECTOR ......................................................................................................4-14
4.4.2 ISA BUS TRANSACTIONS......................................................................................... 4-15
4.4.3 DIRECT MEMORY ACCESS......................................................................................4-17
4.4.4 INTERRUPTS.............................................................................................................. 4-20
4.4.5 INTERVAL TIMER.....................................................................................................4-24
4.4.6 ISA CONFIGURATION...............................................................................................4-24
4.5 SYSTEM CLOCK DISTRIBUTION....................................................................................4-25
4.6 REAL-TIME CLOCK AND CONFIGURATION MEMORY............................................... 4-26
4.6.1 CONFIGURATION MEMORY BYTE DEFINITIONS................................................ 4-27
4.7 I/O MAP AND REGISTER ACCESSING............................................................................4-43
4.7.1 SYSTEM I/O MAP ...................................................................................................... 4-43
4.7.2 87307 I/O CONTROLLER CONFIGURATION........................................................... 4-44
4.8 SYSTEM MANAGEMENT SUPPORT ............................................................................... 4-46
4.8.1 FLASH ROM WRITE PROTECT ................................................................................4-47
4.8.2 PASSWORD PROTECTION........................................................................................ 4-47
4.8.3 I/O SECURITY............................................................................................................ 4-48
4.8.4 USER SECURITY........................................................................................................ 4-48
4.8.5 TEMPERATURE SENSING........................................................................................4-49
4.8.6 COVER LOCK............................................................................................................. 4-49
4.8.7 COVER REMOVAL SENSOR..................................................................................... 4-50
4.8.8 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........................................................................................................5-8
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 IrDA INTERFACE.......................................................................................................5-15
5.4.3 SERIAL INTERFACE PROGRAMMING.................................................................... 5-16
Technical Reference Guide
Compaq Deskpro 4000 and 6000 Personal Computers
featuring the Pentium II Processor
First Edition โ October1997
v
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 DEVICE INTERFACE CONNECTOR................................5-34
5.7 ETHERNET INTERFACE...................................................................................................5-35
5.7.1 NIC CONFIGURATION/CONTROL ........................................................................... 5-36
5.7.2 NIC CONNECTORS.................................................................................................... 5-36
5.8 UNIVERSAL SERIAL BUS INTERFACE...........................................................................5-37
5.8.1 USB CONFIGURATION.............................................................................................. 5-37
5.8.2 USB CONTROL...........................................................................................................5-38
5.8.3 USB CONNECTOR ..................................................................................................... 5-38
5.9 ULTRA SCSI ADAPTER ....................................................................................................5-39
5.9.1 SCSI CONNECTORS ................................................................................................. 5-40
CHAPTER 6 AUDIO SUBSYSTEM......................................................................................................
6.1 INTRODUCTION.................................................................................................................. 6-1
6.2 FUNCTIONAL DESCRIPTION.............................................................................................6-2
6.2.1 PCM AUDIO PROCESSING..........................................................................................6-4
6.2.2 FM SYNTHESIS AUDIO PROCESSING.......................................................................6-7
6.3 AUDIO SUBSYSTEM PROGRAMMING .............................................................................6-8
6.3.1 CONFIGURATION........................................................................................................6-8
6.3.2 CONTROL..................................................................................................................... 6-9
6.4 SPECIFICATIONS..............................................................................................................6-11
CHAPTER 7 POWER SUPPLY AND DISTRIBUTION.......................................................................
7.1 INTRODUCTION.................................................................................................................. 7-1
7.2 POWER SUPPLY ASSEMBLY/CONTROL..........................................................................7-1
7.2.1 POWER SUPPLY ASSEMBLY.....................................................................................7-2
7.2.2 POWER CONTROL.......................................................................................................7-3
7.3 POWER DISTRIBUTION......................................................................................................7-4
7.3.1 3.5/5/12 VDC DISTRIBUTION......................................................................................7-4
7.3.2 LOW VOLTAGE DISTRIBUTION................................................................................ 7-5
7.4 SIGNAL DISTRIBUTION..................................................................................................... 7-6
Technical Reference Guide
Compaq Deskpro 4000 and 6000 Personal Computers
featuring the Pentium II Processor
First Edition โ- October1997
vi
CHAPTER 8 BIOS ROM .......................................................................................................................
8.1 INTRODUCTION.................................................................................................................. 8-1
8.2 BOOT FUNCTIONS..............................................................................................................8-2
8.2.1 BOOT BLOCK...............................................................................................................8-2
8.2.2 QUICKBOOT.................................................................................................................8-2
8.2.3 SILENTBOOT ...............................................................................................................8-2
8.3 ACCESSING CONFIGURATION MEMORY.......................................................................8-3
8.3.1 ACCESSING CMOS......................................................................................................8-3
8.3.2 SETTING DEFAULT PARAMETERS..........................................................................8-3
8.3.3 ACCESSING CMOS FEATURE BITS...........................................................................8-4
8.4 CLIENT MANAGEMENT SUPPORT................................................................................... 8-5
8.4.1 SYSTEM ID...................................................................................................................8-7
8.4.2 SYSTEM INFORMATION TABLE............................................................................... 8-7
8.4.3 DRIVE FAULT PREDICTION..................................................................................... 8-12
8.4.4 DIMM SUPPORT......................................................................................................... 8-13
8.4.5 SECURITY FUNCTIONS............................................................................................8-15
8.4.6 ACCESSING CMOS FEATURE BITS......................................................................... 8-16
8.5 PNP SUPPORT....................................................................................................................8-17
8.6 POWER MANAGEMENT SUPPORT................................................................................. 8-18
APPENDIX A ERROR MESSAGES AND CODES...............................................................................
A.1 INTRODUCTION.................................................................................................................A-1
A.2 POWER-ON MESSAGES..................................................................................................... A-1
A.3 BEEP CODE MESSAGES.................................................................................................... A-1
A.4 POWER-ON SELF TEST (POST) MESSAGES.................................................................... A-2
A.5 PROCESSOR ERROR MESSAGES
(1
XX
-
XX
)....................................................................... A-3
A.6 MEMORY ERROR MESSAGES (2
XX
-
XX
)........................................................................... A-4
A.7 KEYBOARD ERROR MESSAGES (30
X
-
XX
)....................................................................... A-4
A.8 PRINTER ERROR MESSAGES (4
XX
-
XX
)............................................................................ A-5
A.9 VIDEO (GRAPHICS) ERROR MESSAGES (5
XX
-
XX
).......................................................... A-5
A.10 DISKETTE DRIVE ERROR MESSAGES (6
XX
-
XX
) ......................................................... A-6
A.11 SERIAL INTERFACE ERROR MESSAGES (11
XX
-
XX
)................................................... A-6
A.12 MODEM COMMUNICATIONS ERROR MESSAGES (12
XX
-
XX
).................................... A-7
A.13 HARD DRIVE ERROR MESSAGES (17
XX
-
XX
)............................................................... A-8
A.14 HARD DRIVE ERROR MESSAGES (19
XX
-
XX
)............................................................... A-9
A.15 VIDEO (GRAPHICS) ERROR MESSAGES (24
XX
-
XX
) .................................................... A-9
A.16 AUDIO ERROR MESSAGES (3206-
XX
)......................................................................... A-10
A.17 NETWORK INTERFACE ERROR MESSAGES (60
XX
-
XX
) ........................................... A-10
A.18 SCSI INTERFACE ERROR MESSAGES (65
XX
-
XX
, 66
XX
-
XX
, 67
XX
-
XX
) ....................... A-11
A.19 POINTING DEVICE INTERFACE ERROR MESSAGES (8601-
XX
).............................. A-11
A.20 CEMM PRIVILEDGED OPS ERROR MESSAGES........................................................ A-12
A.21 CEMM EXCEPTION ERROR MESSAGES ................................................................... A-12
APPENDIX B ASCII CHARACTER SET.............................................................................................
B.1 INTRODUCTION..................................................................................................................B-1
Technical Reference Guide
Compaq Deskpro 4000 and 6000 Personal Computers
featuring the Pentium II Processor
First Edition โ October1997
vii
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
C.2.5 SCAN CODES.............................................................................................................C-10
C.3 SCANNER DESCRIPTION.................................................................................................C-14
C.3.1 SCANNER OPERATION.............................................................................................C-15
C.3.2 SCANNER INTERFACE .............................................................................................C-18
C.3.3 SCANNER SPECIFICATIONS/REQUIREMENTS......................................................C-20
APPENDIX D MATROX MYSTIQUE GRAPHICS CARD.................................................................
D.1 INTRODUCTION.................................................................................................................D-1
D.2 FUNCTIONAL DESCRIPTION............................................................................................ D-2
D.3 DISPLAY CONFIGURATIONS ........................................................................................... D-3
D.4 MONITOR POWER MANAGEMENT CONTROL.............................................................. D-3
D.5 CONNECTORS.................................................................................................................... D-4
APPENDIX E MATROX MILLENNIUM II GRAPHICS CARD ........................................................
E.1 INTRODUCTION..................................................................................................................E-1
E.2 FUNCTIONAL DESCRIPTION.............................................................................................E-2
E.3 DISPLAY CONFIGURATIONS ............................................................................................E-3
E.4 PROGRAMMING..................................................................................................................E-4
E.4.1 CONFIGURATION........................................................................................................E-4
E.4.2 CONTROL.....................................................................................................................E-4
E.5 MONITOR POWER MANAGEMENT CONTROL...............................................................E-6
E.6 CONNECTORS.....................................................................................................................E-6
Technical Reference Guide
Compaq Deskpro 4000 and 6000 Personal Computers
featuring the Pentium II Processor
First Edition โ- October1997
viii
LIST OF FIGURES
F
IGURE
2โ1. C
OMPAQ
D
ESKPRO
4000 D
ESKTOP
P
ERSONAL
C
OMPUTER WITH
M
ONITOR
..........................2-1
F
IGURE
2โ2. C
ABINET
L
AYOUT
, F
RONT
V
IEW
.......................................................................................2-4
F
IGURE
2โ3. C
ABINET
L
AYOUT
, R
EAR
V
IEW
.........................................................................................2-5
F
IGURE
2โ4. D
ESKTOP
C
HASSIS
L
AYOUT
, T
OP
V
IEW
..............................................................................2-6
F
IGURE
2โ5. M
INITOWER
C
HASSIS
L
AYOUT
, L
EFT
S
IDE
V
IEW
................................................................2-6
F
IGURE
2โ6. S
YSTEM
B
OARD
L
AYOUT
, C
OMPONENT
S
IDE
.....................................................................2-7
F
IGURE
2โ7. S
YSTEM
A
RCHITECTURE
, B
LOCK DIAGRAM
........................................................................2-9
F
IGURE
2โ8. P
ENTIUM
II SEC C
ARTRIDGE AND
H
EAT
S
INK
.................................................................. 2-10
F
IGURE
3โ1. P
ENTIUM
II-B
ASED
P
ROCESSOR
/M
EMORY
S
UBSYSTEM
A
RCHITECTURE
...............................3-2
F
IGURE
3โ2. P
ENTIUM
II P
ROCESSOR
I
NTERNAL
A
RCHITECTURE
............................................................3-3
F
IGURE
3โ3. S
YSTEM
M
EMORY
M
AP
.......................................................................................................3-9
F
IGURE
4โ1. PCI B
US
D
EVICES AND
F
UNCTIONS
.....................................................................................4-2
F
IGURE
4โ2. PCI B
US
C
ONNECTOR
(5V T
YPE
)......................................................................................4-3
F
IGURE
4โ3. T
YPE
0 C
ONFIGURATION
C
YCLE
........................................................................................4-6
F
IGURE
4โ4. PCI C
ONFIGURATION
S
PACE
M
AP
......................................................................................4-7
F
IGURE
4โ5. AGP B
US
C
ONNECTOR
...................................................................................................4-11
F
IGURE
4โ6. ISA B
US
B
LOCK
D
IAGRAM
................................................................................................4-13
F
IGURE
4โ7. ISA E
XPANSION
C
ONNECTOR
..........................................................................................4-14
F
IGURE
4โ8. M
ASKABLE
I
NTERRUPT
P
ROCESSING
, B
LOCK
D
IAGRAM
.................................................... 4-20
F
IGURE
4โ9. C
ONFIGURATION
M
EMORY
M
AP
......................................................................................4-26
F
IGURE
5โ1. 40-P
IN
IDE C
ONNECTOR
. .................................................................................................5-8
F
IGURE
5โ2. 34-P
IN
D
ISKETTE
D
RIVE
C
ONNECTOR
.............................................................................. 5-13
F
IGURE
5โ3. S
ERIAL
I
NTERFACES
B
LOCK
D
IAGRAM
............................................................................. 5-14
F
IGURE
5โ4. S
ERIAL
I
NTERFACE
C
ONNECTOR
(M
ALE
DB-9
AS VIEWED FROM REAR OF CHASSIS
)........... 5-14
F
IGURE
5โ5. I
R
DA I
NTERFACE
C
ONNECTOR
(F
EMALE MINI
-DIN-T
YPE AS VIEWED FROM REAR OF CHASSIS
)5-15
F
IGURE
5โ6. P
ARALLEL
I
NTERFACE
C
ONNECTOR
(F
EMALE
DB-25
AS VIEWED FROM REAR OF CHASSIS
).. 5-27
F
IGURE
5โ7. 8042-T
O
-K
EYBOARD
T
RANSMISSION OF
C
ODE
ED
H
, T
IMING
D
IAGRAM
............................ 5-28
F
IGURE
5โ8. K
EYBOARD OR
P
OINTING
D
EVICE
I
NTERFACE
C
ONNECTOR
............................................... 5-34
F
IGURE
5โ9. E
THERNET
I
NTERFACE
B
LOCK
D
IAGRAM
......................................................................... 5-35
F
IGURE
5โ10. E
THERNET
AUI C
ONNECTOR
(DB-15,
VIEWED FROM REAR
)........................................... 5-36
F
IGURE
5โ11. E
THERNET
RJ-45 C
ONNECTOR
......................................................................................5-36
F
IGURE
5โ12. U
NIVERSAL
S
ERIAL
B
US
C
ONNECTOR
(
ONE OF TWO AS VIEWED FROM REAR OF CHASSIS
)... 5-38
F
IGURE
5โ13. SCSI A
DAPTER
, B
LOCK
D
IAGRAM
.................................................................................. 5-39
F
IGURE
5โ14. U
LTRA
SCSI C
ONNECTOR
(50-
PIN
,
AS VIEWED FROM REAR OF CHASSIS
)............................5-40
F
IGURE
6โ1. A
UDIO
S
UBSYSTEM
B
LOCK
D
IAGRAM
................................................................................6-3
F
IGURE
6โ2. A
NALOG
S
IGNAL
S
AMPLING
/Q
UANTIZING
..........................................................................6-4
F
IGURE
6โ3. DAC O
PERATION
.............................................................................................................6-5
F
IGURE
6โ4. A
UDIO
S
UBSYSTEM
-
TO
-ISA B
US
PCM A
UDIO
D
ATA
F
ORMATS
/ B
YTE
O
RDERING
..............6-6
F
IGURE
6โ5. FM S
YNTHESIS
P
ATCH
......................................................................................................6-7
F
IGURE
6โ6. A
UDIO
C
AR
-
TO
-ISA B
US
FM A
UDIO
D
ATA
F
ORMAT
..........................................................6-7
F
IGURE
7โ1. P
OWER
D
ISTRIBUTION AND
C
ONTROL
, B
LOCK
D
IAGRAM
....................................................7-1
F
IGURE
7โ2. P
OWER
C
ABLE
D
IAGRAM
..................................................................................................7-4
F
IGURE
7โ3. L
OW
V
OLTAGE
S
UPPLY
,
B
LOCK
D
IAGRAM
.........................................................................7-5
F
IGURE
7โ4. S
IGNAL
D
ISTRIBUTION
D
IAGRAM
.......................................................................................7-6
Technical Reference Guide
Compaq Deskpro 4000 and 6000 Personal Computers
featuring the Pentium II Processor
First Edition โ October1997
ix
F
IGURE
Cโ1. K
EYSTROKE
P
ROCESSING
E
LEMENTS
, B
LOCK
D
IAGRAM
....................................................C-2
F
IGURE
Cโ2. K
EYBOARD
-T
O
-S
YSTEM
T
RANSMISSION OF
C
ODE
58
H
, T
IMING
D
IAGRAM
..........................C-3
F
IGURE
Cโ3. U.S. E
NGLISH
(101-K
EY
) K
EYBOARD
K
EY
P
OSITIONS
.......................................................C-4
F
IGURE
Cโ4. N
ATIONAL
(102-K
EY
) K
EYBOARD
K
EY
P
OSITIONS
............................................................C-4
F
IGURE
Cโ5. U.S. E
NGLISH
W
INDOWS
(101W-K
EY
) K
EYBOARD
K
EY
P
OSITIONS
...................................C-5
F
IGURE
Cโ6. N
ATIONAL
W
INDOWS
(102W-K
EY
) K
EYBOARD
K
EY
P
OSITIONS
........................................C-5
F
IGURE
Cโ7. U.S. E
NGLISH
W
INDOWS
(101WE-K
EY
) K
EYBOARD
K
EY
P
OSITIONS
.................................C-6
F
IGURE
Cโ8. N
ATIONAL
W
INDOWS
(102WE-K
EY
) K
EYBOARD
K
EY
P
OSITIONS
......................................C-6
F
IGURE
Cโ9. S
CANNER
E
LEMENTS
, B
LOCK
D
IAGRAM
..........................................................................C-14
F
IGURE
Cโ10. S
CANNER OPERATION
F
LOW
C
HART
..............................................................................C-16
F
IGURE
Dโ1. M
ATROX
M
YSTIQUE
PCI G
RAPHICS
C
ARD
L
AYOUT
(C
OMPAQ P
/
N
007412-001)............... D-1
F
IGURE
Dโ2. M
ATROX
M
YSTIQUE
G
RAPHICS
C
ARD
B
LOCK DIAGRAM
.................................................... D-2
F
IGURE
Dโ3. VGA M
ONITOR
C
ONNECTOR
, (F
EMALE
DB-15,
AS VIEWED FROM REAR
). ........................... D-4
F
IGURE
Dโ4. VGA P
ASS
-T
HROUGH
C
ONNECTOR
(VSFC) (26-P
IN
H
EADER
)......................................... D-4
F
IGURE
Dโ5. G
RAPHICS
M
EMORY
E
XPANSION
C
ONNECTORS
................................................................ D-5
F
IGURE
Eโ1. M
ATROX
M
ILLENNIUM
II AGP G
RAPHICS
C
ARD
L
AYOUT
(C
OMPAQ P
/
N
007448-001)............ 1
F
IGURE
Eโ2. M
ATROX
MGA M
ILLENNIUM
G
RAPHICS
C
ARD
B
LOCK DIAGRAM
........................................... 2
F
IGURE
Eโ3. VGA M
ONITOR
C
ONNECTOR
, (F
EMALE
DB-15,
AS VIEWED FROM REAR
)................................. 6
F
IGURE
Eโ4. G
RAPHICS
M
EMORY
E
XPANSION
C
ONNECTORS
..................................................................... 7
Technical Reference Guide
Compaq Deskpro 4000 and 6000 Personal Computers
featuring the Pentium II Processor
First Edition โ- October1997
x
LIST OF TABLES
T
ABLE
1โ1. A
CRONYMS AND
A
BBREVIATIONS
.......................................................................................1-3
T
ABLE
2โ1. A
RCHITECTURAL
C
OMPARISON
.............................................................................................2-8
T
ABLE
2โ2. S
UPPORT
C
HIPSETS
..........................................................................................................2-11
T
ABLE
2โ3. G
RAPHICS
S
UBSYSTEM
C
OMPARISON
................................................................................ 2-12
T
ABLE
2โ4. E
NVIRONMENTAL
S
PECIFICATIONS
....................................................................................2-14
T
ABLE
2โ5. E
LECTRICAL
S
PECIFICATIONS
...........................................................................................2-14
T
ABLE
2โ6. P
HYSICAL
S
PECIFICATIONS
...............................................................................................2-14
T
ABLE
2โ7. D
ISKETTE
D
RIVE
S
PECIFICATIONS
.....................................................................................2-15
T
ABLE
2โ8. 8
X
CD-ROM D
RIVE
S
PECIFICATIONS
................................................................................ 2-15
T
ABLE
2โ9. S
TANDARD
H
ARD
D
RIVE
S
PECIFICATIONS
......................................................................... 2-16
T
ABLE
3โ1. P
ROCESSOR
/M
EMORY
A
RCHITECTURAL
H
IGHLIGHTS
............................................................3-1
T
ABLE
3โ2. P
ENTIUM
II M
ICROPROCESSOR
B
US
/C
ORE
S
PEED
S
WITCH
S
ETTINGS
....................................3-5
T
ABLE
3โ3. SW2 B
US
/C
ORE
S
PEED
P
OSITIONS TO
GPIO A
SSIGNMENTS
...................................................3-5
T
ABLE
3โ4. SDRAM
P
ERFORMANCE
T
IMES
............................................................................................3-6
T
ABLE
3โ5. SPD A
DDRESS
M
AP
(SDRAM DIMM).................................................................................3-8
T
ABLE
3โ6. H
OST
/PCI B
RIDGE
C
ONFIGURATION
R
EGISTERS
(440LX, D
EVICE
0)................................... 3-10
T
ABLE
4โ1. PCI B
US
C
ONNECTOR
P
INOUT
............................................................................................4-3
T
ABLE
4โ2. PCI B
US
M
ASTERING
D
EVICES
...........................................................................................4-4
T
ABLE
4โ3. PCI D
EVICE
C
ONFIGURATION
A
CCESS
................................................................................4-6
T
ABLE
4โ4. PCI F
UNCTION
C
ONFIGURATION
A
CCES
..............................................................................4-7
T
ABLE
4โ5. PCI D
EVICE
I
DENTIFICATION
.............................................................................................4-8
T
ABLE
4โ6. PCI/ISA B
RIDGE
C
ONFIGURATION
R
EGISTERS
(82371, F
UNCTION
0).................................. 4-10
T
ABLE
4โ7. AGP B
US
C
ONNECTOR
P
INOUT
.........................................................................................4-11
T
ABLE
4โ8. PCI/AGP B
RIDGE
C
ONFIGURATION
R
EGISTERS
(440LX, F
UNCTION
1) ............................... 4-12
T
ABLE
4โ9. ISA E
XPANSION
C
ONNECTOR
P
INOUT
............................................................................... 4-14
T
ABLE
4โ10. D
EFAULT
DMA C
HANNEL
A
SSIGNMENTS
....................................................................... 4-17
T
ABLE
4โ11. DMA P
AGE
R
EGISTER
A
DDRESSES
................................................................................. 4-18
T
ABLE
4โ12. DMA C
ONTROLLER
R
EGISTERS
......................................................................................4-19
T
ABLE
4โ13.
M
ASKABLE
I
NTERRUPT
P
RIORITIES AND
A
SSIGNMENTS
.................................................... 4-21
T
ABLE
4โ14. M
ASKABLE
I
NTERRUPT
C
ONTROL
R
EGISTERS
.................................................................. 4-21
T
ABLE
4โ15. I
NTERVAL
T
IMER
F
UNCTIONS
.........................................................................................4-24
T
ABLE
4โ16. I
NTERVAL
T
IMER
C
ONTROL
R
EGISTERS
........................................................................... 4-24
T
ABLE
4โ17. C
LOCK
G
ENERATION AND
D
ISTRIBUTION
........................................................................ 4-25
T
ABLE
4โ18. C
ONFIGURATION
M
EMORY
(CMOS) M
AP
....................................................................... 4-27
T
ABLE
4โ19. S
YSTEM
I/O M
AP
...........................................................................................................4-43
T
ABLE
4โ20. 87307 I/O C
ONTROLLER
P
N
P S
TANDARD
C
ONTROL
R
EGISTERS
........................................ 4-44
T
ABLE
4โ21. S
YSTEM
M
ANAGEMENT
C
ONTROL
R
EGISTERS
................................................................... 4-46
Technical Reference Guide
Compaq Deskpro 4000 and 6000 Personal Computers
featuring the Pentium II Processor
First Edition โ October1997
xi
T
ABLE
5โ1. IDE PCI C
ONFIGURATION
R
EGISTERS
................................................................................5-2
T
ABLE
5โ2. IDE B
US
M
ASTER
C
ONTROL
R
EGISTERS
.............................................................................5-2
T
ABLE
5โ3. IDE ATA C
ONTROL
R
EGISTERS
.........................................................................................5-3
T
ABLE
5โ4. IDE C
ONTROLLER
C
OMMANDS
..........................................................................................5-6
T
ABLE
5โ5. 40-P
IN
IDE C
ONNECTOR
P
INOUT
.......................................................................................5-8
T
ABLE
5โ6. D
ISKETTE
D
RIVE
C
ONTROLLER
C
ONFIGURATION
R
EGISTERS
............................................. 5-10
T
ABLE
5โ7. D
ISKETTE
D
RIVE
C
ONTROLLER
R
EGISTERS
....................................................................... 5-11
T
ABLE
5โ8. 34-P
IN
D
ISKETTE
D
RIVE
C
ONNECTOR
P
INOUT
................................................................... 5-13
T
ABLE
5โ9. DB-9 S
ERIAL
C
ONNECTOR
P
INOUT
................................................................................... 5-14
T
ABLE
5โ10. I
R
DA DIN C
ONNECTOR
P
INOUT
....................................................................................5-15
T
ABLE
5โ11. S
ERIAL
I
NTERFACE
C
ONFIGURATION
R
EGISTERS
.............................................................. 5-16
T
ABLE
5โ12. S
ERIAL
I
NTERFACE
C
ONTROL
R
EGISTERS
........................................................................ 5-17
T
ABLE
5โ13. P
ARALLEL
I
NTERFACE
C
ONFIGURATION
R
EGISTERS
......................................................... 5-23
T
ABLE
5โ14. P
ARALLEL
I
NTERFACE
C
ONTROL
R
EGISTERS
................................................................... 5-24
T
ABLE
5โ15. DB-25 P
ARALLEL
C
ONNECTOR
P
INOUT
.......................................................................... 5-27
T
ABLE
5โ16. 8042-T
O
-K
EYBOARD
C
OMMANDS
.................................................................................. 5-29
T
ABLE
5โ17. K
EYBOARD
/M
OUSE
I
NTERFACE
C
ONFIGURATION
R
EGISTERS
........................................... 5-30
T
ABLE
5โ18. CPU C
OMMANDS
T
O
T
HE
8042......................................................................................5-32
T
ABLE
5โ19. K
EYBOARD
/P
OINTING
D
EVICE
C
ONNECTOR
P
INOUT
........................................................ 5-34
T
ABLE
5โ20. USB I
NTERFACE
C
ONFIGURATION
R
EGISTERS
................................................................. 5-37
T
ABLE
5โ21. USB C
ONTROL
R
EGISTERS
.............................................................................................5-38
T
ABLE
5โ22. USB C
ONNECTOR
P
INOUT
..............................................................................................5-38
T
ABLE
5โ23.
U
LTRA
SCSI C
ONNECTOR
P
INOUT
....................................................................................5-40
T
ABLE
6โ1. A
UDIO
M
ODE
D
IFFERENCES
...............................................................................................6-6
T
ABLE
6โ2. A
UDIO
S
UBSYSTEM
I/O M
AP
..............................................................................................6-9
T
ABLE
6โ3. C
OMPATIBILITY
M
ODE
A
UDIO
M
IXER
C
ONTROL
R
EGISTER
M
APPING
.....................................6-9
T
ABLE
6โ4. E
XTENDED
M
ODE
A
UDIO
M
IXER
C
ONTROL
R
EGISTER
M
APPING
.......................................... 6-10
T
ABLE
6โ5. FM S
YNTHESIZER
C
ONTROL
R
EGISTER
M
APPING
................................................................ 6-10
T
ABLE
6โ6. A
UDIO
S
UBSYSTEM
S
PECIFICATIONS
................................................................................. 6-11
T
ABLE
7โ1. P
OWER
S
UPPLY
A
SSEMBLY
S
PECIFICATIONS
........................................................................7-2
T
ABLE
8โ1.
P
N
P C
LIENT
M
ANAGEMENT
F
UNCTIONS
(INT15).................................................................8-5
T
ABLE
8โ1. P
N
P BIOS F
UNCTIONS
.....................................................................................................8-17
T
ABLE
8โ2. APM BIOS F
UNCTIONS
(INT15) ..................................................................................... 8-19
T
ABLE
Aโ1. P
OWER
-O
N
M
ESSAGES
..................................................................................................... A-1
T
ABLE
Aโ2. B
EEP
C
ODE
M
ESSAGES
..................................................................................................... A-1
T
ABLE
Aโ3. P
OWER
-O
N
S
ELF
T
EST
(POST) M
ESSAGES
........................................................................ A-2
T
ABLE
Aโ4. P
ROCESSOR
E
RROR
M
ESSAGES
......................................................................................... A-3
T
ABLE
Aโ5. M
EMORY
E
RROR
M
ESSAGES
............................................................................................. A-4
T
ABLE
Aโ6. K
EYBOARD
E
RROR
M
ESSAGES
.......................................................................................... A-4
T
ABLE
Aโ7. P
RINTER
E
RROR
M
ESSAGES
.............................................................................................. A-5
T
ABLE
Aโ8. V
IDEO
(G
RAPHICS
) E
RROR
M
ESSAGES
.............................................................................. A-5
T
ABLE
Aโ9. D
ISKETTE
D
RIVE
E
RROR
M
ESSAGES
.................................................................................. A-6
T
ABLE
Aโ10. S
ERIAL
I
NTERFACE
E
RROR
M
ESSAGES
............................................................................. A-6
T
ABLE
Aโ11. S
ERIAL
I
NTERFACE
E
RROR
M
ESSAGES
............................................................................. A-7
T
ABLE
Aโ12. H
ARD
D
RIVE
E
RROR
M
ESSAGES
...................................................................................... A-8
T
ABLE
Aโ13. H
ARD
D
RIVE
E
RROR
M
ESSAGES
...................................................................................... A-9
T
ABLE
Aโ14. H
ARD
D
RIVE
M
ESSAGES
................................................................................................. A-9
T
ABLE
Aโ15. A
UDIO
E
RROR
M
ESSAGES
............................................................................................. A-10
Technical Reference Guide
Compaq Deskpro 4000 and 6000 Personal Computers
featuring the Pentium II Processor
First Edition โ- October1997
xii
T
ABLE
Aโ16. N
ETWORK
I
NTERFACE
E
RROR
M
ESSAGES
...................................................................... A-10
T
ABLE
Aโ17. SCSI I
NTERFACE
E
RROR
M
ESSAGES
............................................................................. A-11
T
ABLE
Aโ18. P
OINTING
D
EVICE
I
NTERFACE
E
RROR
M
ESSAGES
........................................................... A-11
T
ABLE
Aโ19. CEMM P
RIVILEGED
O
PS
E
RROR
M
ESSAGES
.................................................................. A-12
T
ABLE
Aโ20. CEMM E
XCEPTION
E
RROR
M
ESSAGES
......................................................................... A-12
T
ABLE
Bโ1. ASCII C
HARACTER
S
ET
....................................................................................................B-1
T
ABLE
Cโ1. K
EYBOARD
-
TO
-S
YSTEM
C
OMMANDS
...............................................................................C-10
T
ABLE
Cโ2. K
EYBOARD
S
CAN
C
ODES
.................................................................................................C-11
T
ABLE
Cโ3. S
CANNER
P
ERFORMANCE
C
HART
.....................................................................................C-17
T
ABLE
Cโ4. S
CANNER
I/F S
IGNALS
.....................................................................................................C-18
T
ABLE
Cโ5. S
CANNER
S
PECIFICATIONS
...............................................................................................C-20
T
ABLE
Dโ1. G
RAPHICS
C
ONFIGURATION
D
ISPLAY
M
ODES
...................................................................... D-3
T
ABLE
Dโ2. M
ONITOR
P
OWER
M
ANAGEMENT
C
ONDITIONS
.................................................................. D-3
T
ABLE
Dโ3. DB-15 M
ONITOR
C
ONNECTOR
P
INOUT
............................................................................. D-4
T
ABLE
Dโ4. VGA P
ASSTHROUGH
C
ONNECTOR
(VSFC) P
INOUT
........................................................... D-4
T
ABLE
Dโ5. G
RAPHICS
M
EMORY
E
XPANSION
C
ONNECTOR
P
INOUT
....................................................... D-5
T
ABLE
Eโ1. E
XTENDED
VGA D
ISPLAY
M
ODES
.......................................................................................E-3
T
ABLE
Eโ2. MGA 2064W PCI C
ONFIGURATION
S
PACE
R
EGISTERS
.......................................................E-4
T
ABLE
Eโ3. S
TANDARD
VGA M
ODE
I/O M
APPING
...............................................................................E-4
T
ABLE
Eโ4. M
ONITOR
P
OWER
M
ANAGEMENT
C
ONDITIONS
...................................................................E-6
T
ABLE
Eโ5. DB-15 M
ONITOR
C
ONNECTOR
P
INOUT
..............................................................................E-6
T
ABLE
Eโ6. G
RAPHICS
M
EMORY
E
XPANSION
C
ONNECTOR
P
INOUT
........................................................E-7
Technical Reference Guide
Compaq Deskpro 4000 and 6000 Personal Computers
featuring the Pentium II Processor
First Edition - October1997
1-1
Chapter 1
INTRODUCTION
1.
Chapter 1 INTRODUCTION
1.1
ABOUT THIS GUIDE
This guide provides technical information about the Compaq Deskpro 4000 and 6000 Personal
Computers that employ the Pentium II Processor.
NOTE:
This guide specifically covers systems employing system board PCA# 006627-
xxx (systems introduced September 1997). Pentium II-based systems introduced in July
of 1997 (system board PCA # 006650-xxx) are mentioned in chapter 2 of this document
but use an earlier system architecture that is discussed in detail in the Compaq Deskpro
4000/6000 Personal Computers Technical Reference Guide (document # 299A/0996,
First Edition, September 1996).
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 manufacturerโs components used in the product
covered. For more information on individual commercial-off-the-shelf (COTS) components refer
to the indicated manufacturersโ documentation.
Hardcopy documentation sources:
โฆ The Lotus/Intel/Microsoft Expanded Memory Specification, Ver. 4.0
โฆ PCI Local Bus Specification Revision 2.1
โฆ Extended Industry Standard Architecture Expansion Bus Technical Reference Guide,
p/n 130584, Second Edition, Compaq Computer Corporation
โฆ Compaq Basic Input/Out System (BIOS) Technical Reference Guide
Doc.# 074A/0693, Fourth Edition, Compaq Computer Corporation
Online information sources:
โฆ Compaq Computer Corporation: http://www.compaq.com
โฆ Intel Corporation: http://www.intel.com
โฆ National Semiconductor: http://www.national.com
โฆ Matrox Graphics Inc.: http://www.matrox.com
Chapter 1 Introduction
Compaq Deskpro 4000 and 6000 Personal Computers
featuring the Pentium II Processor
First Edition - October 1997
1-2
1.2 NOTATIONAL CONVENTIONS
1.2.1 VALUES
Hexadecimal values are indicated by the letter โhโ following an alpha-numerical value. Binary
values are indicated by the letter โbโ following a value of ones and zeros. Memory addresses
expressed as โSSSS:OOOOโ (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 microprocessorโs (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.
Technical Reference Guide
Compaq Deskpro 4000 and 6000 Personal Computers
featuring the Pentium II Processor
First Edition - October1997
1-3
1.3 COMMON ACRONYMS AND ABBREVIATIONS
Table 1-1 lists the acronyms and abbreviations used in this guide.
Table 1โ1.
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
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
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
Chapter 1 Introduction
Compaq Deskpro 4000 and 6000 Personal Computers
featuring the Pentium II Processor
First Edition - October 1997
1-4
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
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
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 InfraRed Data Association
IRQ interrupt request
ISA industry standard architecture
JEDEC Joint Electron Device Engineering Council
Kb / KB kilobits / kilobytes (x 1024 bits / x 1024 bytes)
Kb/s kilobits per second
kg kilogram
KHz kilohertz
kv kilovolt
Continued
Technical Reference Guide
Compaq Deskpro 4000 and 6000 Personal Computers
featuring the Pentium II Processor
First Edition - October1997
1-5
Table 1-1. Acronyms and Abbreviations
Continued
Acronym/Abbreviation Description
lb pound
LCD liquid crystal display
LED light-emitting diode
LIF low insertion force (socket)
LSI large scale integration
LSb / LSB least significant bit / least significant byte
LUN logical unit (SCSI)
MMX multimedia extensions
MPEG Motion Picture Experts Group
ms millisecond
MSb / MSB most significant bit / most significant byte
mux multiplex
MVA motion video acceleration
MVW motion video window
n
variable parameter/value
NIC network interface card/controller
NiCad nickel cadmium
NiMH nickel-metal hydride
NMI non-maskable interrupt
ns nanosecond
NT nested task flag
NTSC National Television Standards Committee
NVRAM non-volatile random access memory
OEM original equipment manufacturer
OS operating system
PAL 1. programmable array logic 2. phase altering line
PC personal computer
PCI peripheral component interconnect
PCM pulse code modulation
PCMCIA Personal Computer Memory Card International Association
PF parity flag
PIN personal identification number
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
RH Relative humidity
RMS root mean square
ROM read-only memory
RPM revolutions per minute
RTC real time clock
R/W read/write
Continued
Chapter 1 Introduction
Compaq Deskpro 4000 and 6000 Personal Computers
featuring the Pentium II Processor
First Edition - October 1997
1-6
Table 1-1. Acronyms and Abbreviations
Continued
Acronym/Abbreviation Description
SCSI small computer system interface
SDRAM Synchronous Dynamic RAM
SEC Single Edge-Connector
SECAM sequential colour avec memoire (sequential color with memory)
SF sign flag
SGRAM Synchronous Graphics RAM
SIMM single in-line memory module
SIT system information table
SMI system management interrupt
SMM system management mode
SMRAM system management RAM
SPD serial presence detect
SPP standard parallel port
SRAM static RAM
STN super twist pneumatic
SVGA super VGA
SW software
TAD telephone answering device
TAM telephone answering machine
TCP tape carrier package
TF trap flag
TFT thin-film transistor
TIA Telecommunications Information Administration
TPE twisted pair ethernet
TPI track per inch
TTL transistor-transistor logic
TV television
TX transmit
UART universal asynchronous receiver/transmitter
us /
ยต
s 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
WRAM Windows RAM
ZF zero flag
ZIF zero insertion force (socket)
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