Compaq Deskpro EN Series User manual

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Technical
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Compaq Deskpro EN Series of Personal Computers
Desktop and Minitower Form Factors
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Technical Reference Guide
Compaq Deskpro EN Series of Personal Computers
Desktop and Minitower Form Factors
Third Edition - September 1998
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.
1998 Compaq Computer Corporation
All rights reserved. Printed in the USA
Compaq, Deskpro, LTE, Contura, Presario, ProLinea
Registered U.S. Patent and Trademark Office
Product names mentioned in this document may be trademarks and/or registered trademarks of other companies.
“Pentium” and “MMX” are trademarks of Intel Corporation.
“Windows” is a trademark of Microsoft Corporation.
For more information regarding specifications and Compaq-specific parts please contact Compaq
Computer Corporation.
Technical Reference Guide
for
Compaq Deskpro EN Series of Personal Computers, Desktop and Minitower Form Factors
Third Edition - September 1998
Document Number DSK-113C/0498
Technical Reference Guide
Compaq Deskpro EN Series of Personal Computers
Desktop and Minitower Form Factors
Third Edition–- September1998
ii
Technical Reference Guide
Compaq Deskpro EN Series of Personal Computers
Desktop and Minitower Form Factors
Third Edition - September 1998
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 AND OPTIONS.................................................................................................2-2
2.2.1 STANDARD FEATURES..............................................................................................2-2
2.2.2 OPTIONS.......................................................................................................................2-3
2.3 MECHANICAL DESIGN...................................................................................................... 2-4
2.3.1 CABINET LAYOUTS....................................................................................................2-4
2.3.2 CHASSIS LAYOUTS.....................................................................................................2-6
2.3.3 BOARD LAYOUTS.......................................................................................................2-8
2.4 SYSTEM ARCHITECTURE................................................................................................2-10
2.4.1 PROCESSOR............................................................................................................... 2-12
2.4.2 SYSTEM MEMORY.................................................................................................... 2-13
2.4.3 SUPPORT CHIPSET....................................................................................................2-13
2.4.4 MASS STORAGE........................................................................................................ 2-13
2.4.5 SERIAL AND PARALLEL INTERFACES.................................................................. 2-14
2.4.6 UNIVERSAL SERIAL BUS INTERFACE................................................................... 2-14
2.4.7 GRAPHICS SUBSYSTEM...........................................................................................2-14
2.4.8 AUDIO SUBSYSTEM ................................................................................................. 2-14
2.5 SPECIFICATIONS.............................................................................................................. 2-15
CHAPTER 3 PROCESSOR/MEMORY SUBSYSTEM........................................................................
3.1 INTRODUCTION.................................................................................................................. 3-1
3.2 PROCESSOR/MEMORY SUBSYSTEM ..............................................................................3-2
3.2.1 PROCESSOR................................................................................................................. 3-3
3.2.2 PROCESSOR CHANGING/UPGRADING.....................................................................3-5
3.2.3 SYSTEM MEMORY......................................................................................................3-6
3.2.4 SUBSYSTEM CONFIGURATION.................................................................................3-9
Technical Reference Guide
Compaq Deskpro EN Series of Personal Computers
Desktop and Minitower Form Factors
Third Edition–- September1998
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 POWER MANAGEMENT SUPPORT.....................................................................4-9
4.2.7 PCI CONFIGURATION............................................................................................... 4-10
4.3 AGP BUS OVERVIEW ....................................................................................................... 4-11
4.3.1 BUS TRANSACTIONS................................................................................................ 4-11
4.3.2 AGP CONFIGURATION............................................................................................. 4-14
4.3.3 AGP CONNECTOR..................................................................................................... 4-15
4.4 ISA BUS OVERVIEW.........................................................................................................4-16
4.4.1 ISA CONNECTOR ......................................................................................................4-17
4.4.2 ISA BUS TRANSACTIONS......................................................................................... 4-18
4.4.3 DIRECT MEMORY ACCESS......................................................................................4-20
4.4.4 INTERRUPTS..............................................................................................................4-23
4.4.5 INTERVAL TIMER.....................................................................................................4-27
4.4.6 ISA CONFIGURATION...............................................................................................4-27
4.5 SYSTEM CLOCK DISTRIBUTION.................................................................................... 4-28
4.6 REAL-TIME CLOCK AND CONFIGURATION MEMORY...............................................4-29
4.7 I/O MAP AND REGISTER ACCESSING............................................................................4-46
4.7.1 SYSTEM I/O MAP ......................................................................................................4-46
4.7.2 GPIO UTILIZATION................................................................................................... 4-47
4.8 SYSTEM MANAGEMENT SUPPORT ............................................................................... 4-51
4.8.1 FLASH ROM WRITE PROTECT ................................................................................ 4-52
4.8.2 PASSWORD PROTECTION........................................................................................4-52
4.8.3 I/O SECURITY............................................................................................................ 4-53
4.8.4 USER SECURITY........................................................................................................ 4-53
4.8.5 TEMPERATURE SENSING........................................................................................4-54
4.8.6 SMART COVER LOCK...............................................................................................4-55
4.8.7 SMART COVER REMOVAL SENSOR.......................................................................4-55
4.8.8 POWER MANAGEMENT........................................................................................... 4-56
CHAPTER 5 INPUT/OUTPUT INTERFACES.....................................................................................
5.1 INTRODUCTION.................................................................................................................. 5-1
5.2 ENHANCED IDE INTERFACE............................................................................................5-1
5.2.1 IDE PROGRAMMING...................................................................................................5-1
5.2.2 IDE CONNECTOR........................................................................................................5-8
5.3 DISKETTE DRIVE INTERFACE..........................................................................................5-9
5.3.1 DISKETTE DRIVE PROGRAMMING........................................................................ 5-10
5.3.2 DISKETTE DRIVE CONNECTOR.............................................................................. 5-13
5.4 SERIAL INTERFACES.......................................................................................................5-14
5.4.1 RS-232 INTERFACE ................................................................................................... 5-14
5.4.2 SERIAL INTERFACE PROGRAMMING....................................................................5-15
Technical Reference Guide
Compaq Deskpro EN Series of Personal Computers
Desktop and Minitower Form Factors
Third Edition - September 1998
v
5.5 PARALLEL INTERFACE...................................................................................................5-20
5.5.1 STANDARD PARALLEL PORT MODE..................................................................... 5-20
5.5.2 ENHANCED PARALLEL PORT MODE..................................................................... 5-21
5.5.3 EXTENDED CAPABILITIES PORT MODE............................................................... 5-21
5.5.4 PARALLEL INTERFACE PROGRAMMING.............................................................. 5-22
5.5.5 PARALLEL INTERFACE CONNECTOR ...................................................................5-26
5.6 KEYBOARD/POINTING DEVICE INTERFACE ...............................................................5-27
5.6.1 KEYBOARD INTERFACE OPERATION ...................................................................5-27
5.6.2 POINTING DEVICE INTERFACE OPERATION .......................................................5-29
5.6.3 KEYBOARD/POINTING DEVICE INTERFACE PROGRAMMING ......................... 5-29
5.6.4 KEYBOARD/POINTING DEVICE INTERFACE CONNECTOR................................5-33
5.7 UNIVERSAL SERIAL BUS INTERFACE...........................................................................5-34
5.7.1 USB KEYBOARD CONSIDERATIONS...................................................................... 5-34
5.7.2 USB CONFIGURATION.............................................................................................. 5-34
5.7.3 USB CONTROL........................................................................................................... 5-35
5.7.4 USB CONNECTOR ..................................................................................................... 5-35
CHAPTER 6 AUDIO SUBSYSTEM ......................................................................................................
6.1 INTRODUCTION.................................................................................................................. 6-1
6.2 FUNCTIONAL DESCRIPTION.............................................................................................6-2
6.2.1 PCM AUDIO PROCESSING..........................................................................................6-4
6.2.2 FM SYNTHESIS AUDIO PROCESSING.......................................................................6-7
6.3 PROGRAMMING.................................................................................................................. 6-8
6.3.1 CONFIGURATION........................................................................................................6-8
6.3.2 CONTROL..................................................................................................................... 6-9
6.4 SPECIFICATIONS.............................................................................................................. 6-11
CHAPTER 7 POWER SUPPLY AND DISTRIBUTION.......................................................................
7.1 INTRODUCTION.................................................................................................................. 7-1
7.2 POWER SUPPLY ASSEMBLY/CONTROL..........................................................................7-1
7.2.1 POWER SUPPLY ASSEMBLY.....................................................................................7-2
7.2.2 POWER CONTROL.......................................................................................................7-3
7.3 POWER DISTRIBUTION...................................................................................................... 7-5
7.3.1 3.5/5/12 VDC DISTRIBUTION......................................................................................7-5
7.3.2 LOW VOLTAGE DISTRIBUTION................................................................................7-6
7.4 SIGNAL DISTRIBUTION.....................................................................................................7-7
CHAPTER 8 BIOS ROM .......................................................................................................................
8.1 INTRODUCTION.................................................................................................................. 8-1
8.2 BOOT/RESET FUNCTIONS.................................................................................................8-2
8.2.1 BOOT BLOCK............................................................................................................... 8-2
8.2.2 QUICKBOOT.................................................................................................................8-2
8.2.3 SILENTBOOT ............................................................................................................... 8-2
8.2.4 RESET...........................................................................................................................8-2
Technical Reference Guide
Compaq Deskpro EN Series of Personal Computers
Desktop and Minitower Form Factors
Third Edition–- September1998
vi
8.3 MEMORY DETECTION AND CONFIGURATION..............................................................8-3
8.4 DESKTOP MANAGEMENT SUPPORT ............................................................................... 8-4
8.4.1 SYSTEM ID................................................................................................................... 8-6
8.4.2 SYSTEM INFORMATION TABLE............................................................................... 8-6
8.4.3 EDID RETRIEVE........................................................................................................ 8-13
8.4.4 DRIVE FAULT PREDICTION.....................................................................................8-13
8.4.5 SYSTEM MAP RETRIEVAL....................................................................................... 8-14
8.4.6 FLASH ROM FUNCTIONS......................................................................................... 8-15
8.4.7 POWER BUTTON FUNCTIONS.................................................................................8-15
8.4.8 ACCESSING CMOS....................................................................................................8-16
8.4.9 ACCESSING CMOS FEATURE BITS......................................................................... 8-16
8.4.10 SECURITY FUNCTIONS............................................................................................ 8-18
8.5 PNP SUPPORT.................................................................................................................... 8-19
8.5.1 SMBIOS....................................................................................................................... 8-20
8.6 POWER MANAGEMENT FUNCTIONS ............................................................................8-21
8.6.1 INDEPENDENT PM SUPPORT .................................................................................. 8-21
8.6.2 ACPI SUPPORT........................................................................................................... 8-21
8.6.3 APM SUPPORT........................................................................................................... 8-22
8.7 USB LEGACY SUPPORT ................................................................................................... 8-24
8.8 BIOS UPGRADING............................................................................................................. 8-24
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
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 EN Series of Personal Computers
Desktop and Minitower Form Factors
Third Edition - September 1998
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-6
C.2.4 KEYBOARD COMMANDS...........................................................................................C-9
C.2.5 SCAN CODES...............................................................................................................C-9
APPENDIX D COMPAQ 10/100 TX PCI INTEL WOL UTP CONTROLLER CARD.......................
D.1 INTRODUCTION.................................................................................................................D-1
D.2 FUNCTIONAL DESCRIPTION............................................................................................ D-2
D.2.1 STATUS INDICATORS................................................................................................ D-2
D.2.2 CARD POWER AND CLOCK...................................................................................... D-3
D.2.3 82558 CONTROLLER.................................................................................................. D-3
D.2.4 POWER MANAGEMENT SUPPORT........................................................................... D-4
D.3 CONFIGURATION/CONTROL ........................................................................................... D-5
D.4 RJ-45 CONNECTOR............................................................................................................ D-5
D.5 SPECIFICATIONS...............................................................................................................D-5
APPENDIX E WIDE ULTRA SCSI HOST ADAPTER ........................................................................
E.1 INTRODUCTION..................................................................................................................E-1
E.2 FUNCTIONAL DESCRIPTION.............................................................................................E-2
E.3 SCSI ADAPTER PROGRAMMING......................................................................................E-3
E.3.1 SCSI ADAPTER CONFIGURATION ............................................................................E-3
E.3.2 SCSI ADAPTER CONTROL .........................................................................................E-3
E.4 SPECIFCATIONS .................................................................................................................E-3
E.5 USER GUIDELINES.............................................................................................................E-4
E.6 SCSI
CONNECTORS ............................................................................................................E-5
APPENDIX F ATI RAGE PRO AGP 1X/2X GRAPHICS CARDS.......................................................
F.1 INTRODUCTION..................................................................................................................F-1
F.2 FUNCTIONAL DESCRIPTION.............................................................................................F-2
F.2.1 ATI RAGE PRO TURBO AGP GRAPHICS CONTROLLER.........................................F-3
F.3 DISPLAY MODES................................................................................................................F-4
F.4 PROGRAMMING..................................................................................................................F-5
F.4.1 CONFIGURATION........................................................................................................F-5
F.4.2 CONTROL.....................................................................................................................F-5
F.5 MONITOR POWER MANAGEMENT CONTROL...............................................................F-6
F.6 CONNECTORS.....................................................................................................................F-6
F.6.1 MEMORY EXPANSION CONNECTOR.......................................................................F-6
F.6.2 MONITOR CONNECTOR.............................................................................................F-7
F.6.3 ATI MULTIMEDIA CHANNEL CONNECTOR............................................................F-8
Technical Reference Guide
Compaq Deskpro EN Series of Personal Computers
Desktop and Minitower Form Factors
Third Edition–- September1998
viii
LIST OF FIGURES
F
IGURE
2–1. C
OMPAQ
D
ESKPRO
EN P
ERSONAL
C
OMPUTER WITH
M
ONITOR
...........................................2-1
F
IGURE
2–2. C
ABINET
L
AYOUTS
, F
RONT
V
IEW
......................................................................................2-4
F
IGURE
2–3. C
ABINET
L
AYOUTS
, R
EAR
V
IEW
........................................................................................2-5
F
IGURE
2–4. D
ESKTOP
C
HASSIS
L
AYOUT
, T
OP
V
IEW
..............................................................................2-6
F
IGURE
2–5. M
INITOWER
C
HASSIS
L
AYOUT
, L
EFT
S
IDE
V
IEW
................................................................2-7
F
IGURE
2–6. S
YSTEM
B
OARD
C
ONNECTOR AND
S
WITCH
L
OCATIONS
......................................................2-8
F
IGURE
2–7. B
ACKLPANE
B
OARD
C
ONNECTOR
, H
EADER
,
AND
S
WITCH
L
OCATIONS
................................2-9
F
IGURE
2–8. S
YSTEM
A
RCHITECTURE
, B
LOCK DIAGRAM
...................................................................... 2-11
F
IGURE
2–9. P
ROCESSOR
P
ACKAGE
C
OMPARISON
................................................................................ 2-12
F
IGURE
3–1. P
ROCESSOR
/M
EMORY
S
UBSYSTEM
A
RCHITECTURE
............................................................3-2
F
IGURE
3–2. P
ENTIUM
II P
ROCESSOR
I
NTERNAL
A
RCHITECTURE
............................................................3-3
F
IGURE
3–3. C
ELERON
P
ROCESSOR
I
NTERNAL
A
RCHITECTURE
...............................................................3-4
F
IGURE
3–4. S
YSTEM
M
EMORY
M
AP
.....................................................................................................3-8
F
IGURE
4–1. PCI B
US
D
EVICES AND
F
UNCTIONS
....................................................................................4-2
F
IGURE
4–2. PCI B
US
C
ONNECTOR
(32-B
IT
T
YPE
).................................................................................4-3
F
IGURE
4–3. T
YPE
0 C
ONFIGURATION
C
YCLE
........................................................................................4-6
F
IGURE
4–4. PCI C
ONFIGURATION
S
PACE
M
AP
......................................................................................4-7
F
IGURE
4–5. AGP 1X D
ATA
T
RANSFER
(P
EAK
T
RANSFER
R
ATE
: 266 MB/
S
)........................................ 4-12
F
IGURE
4–6. AGP 2X D
ATA
T
RANSFER
(P
EAK
T
RANSFER
R
ATE
: 532 MB/
S
)........................................ 4-13
F
IGURE
4–7. AGP B
US
C
ONNECTOR
...................................................................................................4-15
F
IGURE
4–8. ISA B
US
B
LOCK
D
IAGRAM
.............................................................................................4-16
F
IGURE
4–9. ISA E
XPANSION
C
ONNECTOR
..........................................................................................4-17
F
IGURE
4–10. M
ASKABLE
I
NTERRUPT
P
ROCESSING
, B
LOCK
D
IAGRAM
.................................................. 4-23
F
IGURE
4–11. C
ONFIGURATION
M
EMORY
M
AP
.................................................................................... 4-29
F
IGURE
5–1. 40-P
IN
IDE C
ONNECTOR
. ................................................................................................. 5-8
F
IGURE
5–2. 34-P
IN
D
ISKETTE
D
RIVE
C
ONNECTOR
.............................................................................. 5-13
F
IGURE
5–3. S
ERIAL
I
NTERFACES
B
LOCK
D
IAGRAM
............................................................................. 5-14
F
IGURE
5–4. S
ERIAL
I
NTERFACE
C
ONNECTOR
(M
ALE
DB-9
AS VIEWED FROM REAR OF CHASSIS
)........... 5-14
F
IGURE
5–5. P
ARALLEL
I
NTERFACE
C
ONNECTOR
(F
EMALE
DB-25
AS VIEWED FROM REAR OF CHASSIS
).. 5-26
F
IGURE
5–6. 8042-T
O
-K
EYBOARD
T
RANSMISSION OF
C
ODE
ED
H
, T
IMING
D
IAGRAM
............................ 5-27
F
IGURE
5–7. K
EYBOARD OR
P
OINTING
D
EVICE
I
NTERFACE
C
ONNECTOR
............................................... 5-33
F
IGURE
5–8. U
NIVERSAL
S
ERIAL
B
US
C
ONNECTOR
(
ONE OF TWO AS VIEWED FROM REAR OF CHASSIS
).....5-35
F
IGURE
6–1. A
UDIO
S
UBSYSTEM
B
LOCK
D
IAGRAM
................................................................................6-3
F
IGURE
6–2. A
NALOG
S
IGNAL
S
AMPLING
/Q
UANTIZING
..........................................................................6-4
F
IGURE
6–3. DAC O
PERATION
.............................................................................................................6-5
F
IGURE
6–4. A
UDIO
S
UBSYSTEM
-
TO
-ISA B
US
PCM A
UDIO
D
ATA
F
ORMATS
/ B
YTE
O
RDERING
..............6-6
F
IGURE
6–5. FM S
YNTHESIS
P
ATCH
......................................................................................................6-7
F
IGURE
6–6. A
UDIO
C
AR
-
TO
-ISA B
US
FM A
UDIO
D
ATA
F
ORMAT
..........................................................6-7
F
IGURE
7–1. P
OWER
D
ISTRIBUTION AND
C
ONTROL
, B
LOCK
D
IAGRAM
....................................................7-1
F
IGURE
7–2. P
OWER
C
ABLE
D
IAGRAM
..................................................................................................7-5
F
IGURE
7–3. L
OW
V
OLTAGE
S
UPPLY
, B
LOCK
D
IAGRAM
.........................................................................7-6
F
IGURE
7–4. S
IGNAL
D
ISTRIBUTION
D
IAGRAM
.......................................................................................7-7
F
IGURE
7–5. B
ACKPLANE
H
EADER
P
INOUTS
...........................................................................................7-8
Technical Reference Guide
Compaq Deskpro EN Series of Personal Computers
Desktop and Minitower Form Factors
Third Edition - September 1998
ix
F
IGURE
C–1. K
EYSTROKE
P
ROCESSING
E
LEMENTS
, B
LOCK
D
IAGRAM
....................................................C-2
F
IGURE
C–2. K
EYBOARD
-T
O
-S
YSTEM
T
RANSMISSION OF
C
ODE
58
H
, T
IMING
D
IAGRAM
..........................C-3
F
IGURE
C–3. U.S. E
NGLISH
(101-K
EY
) K
EYBOARD
K
EY
P
OSITIONS
.......................................................C-4
F
IGURE
C–4. N
ATIONAL
(102-K
EY
) K
EYBOARD
K
EY
P
OSITIONS
............................................................C-4
F
IGURE
C–5. U.S. E
NGLISH
W
INDOWS
(101W-K
EY
) K
EYBOARD
K
EY
P
OSITIONS
...................................C-5
F
IGURE
C–6. N
ATIONAL
W
INDOWS
(102W-K
EY
) K
EYBOARD
K
EY
P
OSITIONS
........................................C-5
F
IGURE
D–1. C
OMPAQ
10/100 TX WOL C
ONTROLLER
C
ARD
L
AYOUT
(PCA# 323550-001)................. D-1
F
IGURE
D–2. C
OMPAQ
10/100 TX PCI I
NTEL
WOL UTP C
ONTROLLER
C
ARD
B
LOCK
D
IAGRAM
........... D-2
F
IGURE
D–3. 82558 C
ONTROLLER
I
NTERNAL
A
RCHITECTURE
............................................................... D-3
F
IGURE
D–4. E
THERNET
TPE C
ONNECTOR
(RJ-45,
VIEWED FROM CARD EDGE
) ..................................... D-5
F
IGURE
E–1. W
IDE
U
LTRA
SCSI H
OST
A
DAPTER
C
ARD
L
AYOUT
...........................................................E-1
F
IGURE
E–2. A
DAPTEC
AHA-2940U U
LTRA
SCSI A
DAPTER
C
ARD
B
LOCK
D
IAGRAM
.............................E-2
F
IGURE
E–3. U
LTRA
SCSI C
ONNECTOR
(50-
PIN
,
AS SEEN FROM REAR OF CARD
)........................................E-5
F
IGURE
E–4. W
IDE
U
LTRA
SCSI C
ONNECTOR
(68-
PIN
,
AS SEEN FROM TOP OF CARD
).................................E-6
F
IGURE
F–1. ATI RAGE PRO AGP G
RAPHICS
C
ARD
L
AYOUT
(NLX
VERSION SHOWN
)...........................F-1
F
IGURE
F–2. ATI RAGE PRO AGP G
RAPHICS
C
ARD
B
LOCK DIAGRAM
.................................................F-2
F
IGURE
F–3. ATI 3DR
AGE
P
RO
G
RAPHICS
C
ONTROLLER
I
NTERNAL
A
RCHITECTURE
...............................F-3
F
IGURE
F–4. VGA M
ONITOR
C
ONNECTOR
, (F
EMALE
DB-15,
AS VIEWED FROM REAR
)..............................F-7
F
IGURE
F–5. AMC C
ONNECTOR
(40-P
IN
H
EADER
P1) ...........................................................................F-8
Technical Reference Guide
Compaq Deskpro EN Series of Personal Computers
Desktop and Minitower Form Factors
Third Edition–- September1998
x
LIST OF TABLES
T
ABLE
1–1. A
CRONYMS AND
A
BBREVIATIONS
.......................................................................................1-3
T
ABLE
2–1. M
ODEL
D
IFFERENCES
.......................................................................................................2-10
T
ABLE
2–2. S
UPPORT
C
HIPSETS
..........................................................................................................2-13
T
ABLE
2–3. G
RAPHICS
S
UBSYSTEM
C
OMPARISON
................................................................................ 2-14
T
ABLE
2–4. E
NVIRONMENTAL
S
PECIFICATIONS
.................................................................................... 2-15
T
ABLE
2–5. E
LECTRICAL
S
PECIFICATIONS
...........................................................................................2-15
T
ABLE
2–6. P
HYSICAL
S
PECIFICATIONS
...............................................................................................2-15
T
ABLE
2–7. D
ISKETTE
D
RIVE
S
PECIFICATIONS
..................................................................................... 2-16
T
ABLE
2–8. 24
X
CD-ROM D
RIVE
S
PECIFICATIONS
.............................................................................. 2-16
T
ABLE
2–9. H
ARD
D
RIVE
S
PECIFICATIONS
...........................................................................................2-17
T
ABLE
3–1. P
ROCESSOR
C
OMPARISON
...................................................................................................3-3
T
ABLE
3–2. B
US
/C
ORE
S
PEED
S
WITCH
S
ETTINGS
...................................................................................3-5
T
ABLE
3–3. SPD A
DDRESS
M
AP
(SDRAM DIMM)...............................................................................3-7
T
ABLE
3–4. H
OST
/PCI B
RIDGE
C
ONFIGURATION
R
EGISTERS
(443BX, F
UNCTION
0) ............................... 3-9
T
ABLE
4–1. PCI B
US
C
ONNECTOR
P
INOUT
............................................................................................4-3
T
ABLE
4–2. PCI B
US
M
ASTERING
D
EVICES
...........................................................................................4-4
T
ABLE
4–3. PCI D
EVICE
C
ONFIGURATION
A
CCESS
................................................................................4-6
T
ABLE
4–4. PCI F
UNCTION
C
ONFIGURATION
A
CCES
..............................................................................4-7
T
ABLE
4–5. PCI D
EVICE
I
DENTIFICATION
.............................................................................................4-8
T
ABLE
4–6. PCI/ISA B
RIDGE
C
ONFIGURATION
R
EGISTERS
(82371, F
UNCTION
0)................................. 4-10
T
ABLE
4–7. PCI/AGP B
RIDGE
C
ONFIGURATION
R
EGISTERS
(82371, F
UNCTION
1)...............................4-14
T
ABLE
4–8. AGP B
US
C
ONNECTOR
P
INOUT
....................................................................................... 4-15
T
ABLE
4–9. ISA E
XPANSION
C
ONNECTOR
P
INOUT
............................................................................. 4-17
T
ABLE
4–10. D
EFAULT
DMA C
HANNEL
A
SSIGNMENTS
....................................................................... 4-20
T
ABLE
4–11. DMA P
AGE
R
EGISTER
A
DDRESSES
................................................................................. 4-21
T
ABLE
4–12. DMA C
ONTROLLER
R
EGISTERS
...................................................................................... 4-22
T
ABLE
4–13. M
ASKABLE
I
NTERRUPT
P
RIORITIES AND
A
SSIGNMENTS
.................................................... 4-24
T
ABLE
4–14. M
ASKABLE
I
NTERRUPT
C
ONTROL
R
EGISTERS
.................................................................. 4-24
T
ABLE
4–15. I
NTERVAL
T
IMER
F
UNCTIONS
.........................................................................................4-27
T
ABLE
4–16. I
NTERVAL
T
IMER
C
ONTROL
R
EGISTERS
........................................................................... 4-27
T
ABLE
4–17. C
LOCK
G
ENERATION AND
D
ISTRIBUTION
........................................................................ 4-28
T
ABLE
4–18. C
ONFIGURATION
M
EMORY
(CMOS) M
AP
....................................................................... 4-30
T
ABLE
4–19. S
YSTEM
I/O M
AP
...........................................................................................................4-46
T
ABLE
4–20. 82371 S
OUTH
B
RIDGE
G
ENERAL
P
URPOSE
I
NPUT
P
ORT
U
TILIZATION
............................... 4-47
T
ABLE
4–21. 82371 S
OUTH
B
RIDGE
G
ENERAL
P
URPOSE
O
UTPUT
P
ORT
U
TILIZATION
............................ 4-48
T
ABLE
4–22. 87307 I/O C
ONTROLLER
P
N
P S
TANDARD
C
ONTROL
R
EGISTERS
...................................... 4-49
T
ABLE
4–23. S
YSTEM
M
ANAGEMENT
C
ONTROL
R
EGISTERS
................................................................. 4-51
T
ABLE
5–1. IDE PCI C
ONFIGURATION
R
EGISTERS
..............................................................................5-2
T
ABLE
5–2. IDE B
US
M
ASTER
C
ONTROL
R
EGISTERS
...........................................................................5-2
T
ABLE
5–3. IDE ATA C
ONTROL
R
EGISTERS
.......................................................................................5-3
T
ABLE
5–4. IDE C
ONTROLLER
C
OMMANDS
........................................................................................5-6
T
ABLE
5–5. 40-P
IN
IDE C
ONNECTOR
P
INOUT
......................................................................................5-8
T
ABLE
5–6. D
ISKETTE
D
RIVE
C
ONTROLLER
C
ONFIGURATION
R
EGISTERS
............................................ 5-10
T
ABLE
5–7. D
ISKETTE
D
RIVE
C
ONTROLLER
R
EGISTERS
...................................................................... 5-11
T
ABLE
5–8. 34-P
IN
D
ISKETTE
D
RIVE
C
ONNECTOR
P
INOUT
.................................................................. 5-13
Technical Reference Guide
Compaq Deskpro EN Series of Personal Computers
Desktop and Minitower Form Factors
Third Edition - September 1998
xi
T
ABLE
5–9. DB-9 S
ERIAL
C
ONNECTOR
P
INOUT
.................................................................................. 5-14
T
ABLE
5–10. S
ERIAL
I
NTERFACE
C
ONFIGURATION
R
EGISTERS
.............................................................. 5-15
T
ABLE
5–11. S
ERIAL
I
NTERFACE
C
ONTROL
R
EGISTERS
........................................................................ 5-16
T
ABLE
5–12. P
ARALLEL
I
NTERFACE
C
ONFIGURATION
R
EGISTERS
......................................................... 5-22
T
ABLE
5–13. P
ARALLEL
I
NTERFACE
C
ONTROL
R
EGISTERS
................................................................... 5-23
T
ABLE
5–14. DB-25 P
ARALLEL
C
ONNECTOR
P
INOUT
.......................................................................... 5-26
T
ABLE
5–15. 8042-T
O
-K
EYBOARD
C
OMMANDS
.................................................................................. 5-28
T
ABLE
5–16. K
EYBOARD
/M
OUSE
I
NTERFACE
C
ONFIGURATION
R
EGISTERS
........................................... 5-29
T
ABLE
5–17. CPU C
OMMANDS
T
O
T
HE
8042...................................................................................... 5-31
T
ABLE
5–18. K
EYBOARD
/P
OINTING
D
EVICE
C
ONNECTOR
P
INOUT
........................................................ 5-33
T
ABLE
5–19. USB I
NTERFACE
C
ONFIGURATION
R
EGISTERS
................................................................. 5-34
T
ABLE
5–20. USB C
ONTROL
R
EGISTERS
.............................................................................................5-35
T
ABLE
5–21. USB C
ONNECTOR
P
INOUT
..............................................................................................5-35
T
ABLE
6–1. A
UDIO
M
ODE
D
IFFERENCES
...............................................................................................6-6
T
ABLE
6–2. A
UDIO
S
UBSYSTEM
I/O M
AP
..............................................................................................6-9
T
ABLE
6–3. C
OMPATIBILITY
M
ODE
A
UDIO
M
IXER
C
ONTROL
R
EGISTER
M
APPING
...................................6-9
T
ABLE
6–4. E
XTENDED
M
ODE
A
UDIO
M
IXER
C
ONTROL
R
EGISTER
M
APPING
........................................ 6-10
T
ABLE
6–5. FM S
YNTHESIZER
C
ONTROL
R
EGISTER
M
APPING
.............................................................. 6-10
T
ABLE
6–6. A
UDIO
S
UBSYSTEM
S
PECIFICATIONS
................................................................................. 6-11
T
ABLE
7–1. P
OWER
S
UPPLY
A
SSEMBLY
S
PECIFICATIONS
........................................................................7-2
T
ABLE
8–1. D
ESKTOP
M
ANAGEMENT
F
UNCTIONS
(INT15) .................................................................... 8-4
T
ABLE
8–1. P
N
P BIOS F
UNCTIONS
.....................................................................................................8-19
T
ABLE
8–2. APM BIOS F
UNCTIONS
(INT15) ..................................................................................... 8-23
T
ABLE
A–1. P
OWER
-O
N
M
ESSAGES
..................................................................................................... A-1
T
ABLE
A–2. B
EEP
/K
EYBOARD
LED C
ODES
.......................................................................................... A-1
T
ABLE
A–3. P
OWER
-O
N
S
ELF
T
EST
(POST) M
ESSAGES
........................................................................ A-2
T
ABLE
A–4. P
ROCESSOR
E
RROR
M
ESSAGES
......................................................................................... A-3
T
ABLE
A–5. M
EMORY
E
RROR
M
ESSAGES
............................................................................................. A-4
T
ABLE
A–6. K
EYBOARD
E
RROR
M
ESSAGES
.......................................................................................... A-4
T
ABLE
A–7. P
RINTER
E
RROR
M
ESSAGES
.............................................................................................. A-5
T
ABLE
A–8. V
IDEO
(G
RAPHICS
) E
RROR
M
ESSAGES
.............................................................................. A-5
T
ABLE
A–9. D
ISKETTE
D
RIVE
E
RROR
M
ESSAGES
.................................................................................. A-6
T
ABLE
A–10.
S
ERIAL
I
NTERFACE
E
RROR
M
ESSAGES
............................................................................. A-6
T
ABLE
A–11. S
ERIAL
I
NTERFACE
E
RROR
M
ESSAGES
............................................................................. A-7
T
ABLE
A–12. H
ARD
D
RIVE
E
RROR
M
ESSAGES
...................................................................................... A-8
T
ABLE
A–13. H
ARD
D
RIVE
E
RROR
M
ESSAGES
...................................................................................... A-9
T
ABLE
A–14. H
ARD
D
RIVE
M
ESSAGES
................................................................................................. A-9
T
ABLE
A–15. A
UDIO
E
RROR
M
ESSAGES
............................................................................................. A-10
T
ABLE
A–16. N
ETWORK
I
NTERFACE
E
RROR
M
ESSAGES
...................................................................... A-10
T
ABLE
A–17. SCSI I
NTERFACE
E
RROR
M
ESSAGES
............................................................................. A-11
T
ABLE
A–18. P
OINTING
D
EVICE
I
NTERFACE
E
RROR
M
ESSAGES
........................................................... A-11
T
ABLE
A–19. CEMM P
RIVILEGED
O
PS
E
RROR
M
ESSAGES
.................................................................. A-12
T
ABLE
A–20. CEMM E
XCEPTION
E
RROR
M
ESSAGES
......................................................................... A-12
T
ABLE
B–1. ASCII C
HARACTER
S
ET
....................................................................................................B-1
T
ABLE
C–1. K
EYBOARD
-
TO
-S
YSTEM
C
OMMANDS
.................................................................................C-9
T
ABLE
C–2. K
EYBOARD
S
CAN
C
ODES
.................................................................................................C-10
Technical Reference Guide
Compaq Deskpro EN Series of Personal Computers
Desktop and Minitower Form Factors
Third Edition–- September1998
xii
T
ABLE
D–1. O
PERATING
S
PECIFICATIONS
............................................................................................. D-5
T
ABLE
E–1. U
LTRA
SCSI H
OST
A
DAPTER
C
ARD
C
ONTROL
R
EGISTER
M
APPING
......................................E-3
T
ABLE
E–2.
U
LTRA
SCSI H
OST
A
DAPTER
C
ARD
S
PECIFICATIONS
...........................................................E-3
T
ABLE
E–3. W
IDE
U
LTRA
SCSI A
DAPTER
C
ARD
T
YPICAL
C
ONFIGURATION
............................................E-4
T
ABLE
E–4. SCSI C
ONNECTOR
P
INOUT
................................................................................................E-5
T
ABLE
E–5. W
IDE
U
LTRA
SCSI C
ONNECTOR
P
INOUT
............................................................................E-6
T
ABLE
F–1. 2D G
RAPHICS
D
ISPLAY
M
ODES
(
W
/SGRAM)......................................................................F-4
T
ABLE
F–2. 3D G
RAPHICS
D
ISPLAY
M
ODES
..........................................................................................F-4
T
ABLE
F–3. ATI RAGE PRO PCI C
ONFIGURATION
S
PACE
R
EGISTERS
..................................................F-5
T
ABLE
F–4. S
TANDARD
VGA M
ODE
I/O M
APPING
................................................................................F-5
T
ABLE
F–5. M
ONITOR
P
OWER
M
ANAGEMENT
C
ONDITIONS
....................................................................F-6
T
ABLE
F–6. DB-15 M
ONITOR
C
ONNECTOR
P
INOUT
...............................................................................F-7
T
ABLE
F–7. M
ULTIMEDIA
I
NTERFACE
C
ONNECTOR
P
INOUT
...................................................................F-8
Technical Reference Guide
Compaq Deskpro EN Series of Personal Computers
Desktop and Minitower Form Factors
Third Edition - September 1998
1-1
Chapter 1
INTRODUCTION
1.
Chapter 1 INTRODUCTION
1.1
ABOUT THIS GUIDE
This guide provides technical information about the Compaq Deskpro EN Series of Personal
Computers in desktop and minitower form factors. 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 GUIDE
This guide consists of chapters and appendices. The chapters primarily describe the hardware
and firmware elements contained within the chassis and specifically deal with the system board
and the power supply assembly. The appendices contain general information about standard
peripheral devices such as the keyboard as well as separate audio or other interface cards, as well
as other general information in tabular format.
1.1.2
ADDITIONAL INFORMATION SOURCES
This guide does not describe in detail other manufacturer’s components used in the product
covered. For more information on individual commercial-off-the-shelf (COTS) components refer
to the indicated manufacturers’ documentation. The products covered by this guide use
architecture based on industry-standard specifications that can be referenced for detailed
information.
Hardcopy documentation sources:
The Lotus/Intel/Microsoft Expanded Memory Specification, Ver. 4.0
PCI Local Bus Specification Revision 2.1
Online information sources:
Compaq Computer Corporation: http://www.compaq.com
Intel Corporation: http://www.intel.com
National Semiconductor Incorporated: http://www.national.com
ATI Incorporated: http://www.atitech.com
Chapter 1 Introduction
Compaq Deskpro EN Series of Personal Computers
Desktop and Minitower Form Factors
Third Edition – September 1998
1-2
1.2 NOTATIONAL CONVENTIONS
1.2.1 VALUES
Hexadecimal values are indicated by the letterh” following an alpha-numerical value. Binary
values are indicated by the letter “b” following a value of ones and zeros. Memory addresses
expressed as “SSSS:OOOO” (SSSS = 16-bit segment, OOOO = 16-bit offset) can be assumed as
a hexadecimal value. Values that have no succeeding letter can be assumed to be decimal.
1.2.2 RANGES
Ranges or limits for a parameter are shown as a pair of values separated by two dots:
Example: Bits <7..4> = bits 7, 6, 5, and 4.
1.2.3 SIGNAL LABELS
Signal names are indicated using abbreviations, acronyms, or, if possible, the full signal name in
all capital letters. Signals that are meant to be active low are indicated with a dash immediately
following the name.
1.2.4 REGISTER NOTATION AND USAGE
This guide uses standard Intel naming conventions in discussing the microprocessor’s (CPU)
internal registers. Registers that are accessed through programmable I/O using an indexing
scheme are indicated using the following format:
03C5.17h
Index port
Data port
In the example above, register 03C5.17h is accessed by writing the index port value 17h to the
index address (03C4h), followed by a write to or a read from port 03C5h.
1.2.5 BIT NOTATION
Bit values are labeled with bit <0> representing the least-significant bit (LSb) and bit <7>
representing the most-significant bit (MSb) of a byte. Bytes, words, double words, and quad
words are typically shown with most-significant portions on the left or top and the least-
significant portions on the right or bottom respectively.
Technical Reference Guide
Compaq Deskpro EN Series of Personal Computers
Desktop and Minitower Form Factors
Third Edition - September 1998
1-3
1.3 COMMON ACRONYMS AND ABBREVIATIONS
Table 1-1 lists the acronyms and abbreviations used in this 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/output system
bis second/new revision
BitBLT bit block transfer
BNC Bayonet Neill-Concelman (connector)
bps or b/s bits per second
BSP Bootstrap processor
BTO Built to order
CAS column address strobe
CD compact disk
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
Chapter 1 Introduction
Compaq Deskpro EN Series of Personal Computers
Desktop and Minitower Form Factors
Third Edition – September 1998
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
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 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 EN Series of Personal Computers
Desktop and Minitower Form Factors
Third Edition - September 1998
1-5
Table 1-1. Acronyms and Abbreviations
Continued
Acronym/Abbreviation Description
lb pound
LAN local area network
LCD liquid crystal display
LED light-emitting diode
LIF low insertion force (socket)
LSI large scale integration
LSb / LSB least significant bit / least significant byte
LUN logical unit (SCSI)
MMX multimedia extensions
MPEG Motion Picture Experts Group
ms millisecond
MSb / MSB most significant bit / most significant byte
mux multiplex
MVA motion video acceleration
MVW motion video window
n
variable parameter/value
NIC network interface card/controller
NiCad nickel cadmium
NiMH nickel-metal hydride
NMI non-maskable interrupt
ns nanosecond
NT nested task flag
NTSC National Television Standards Committee
NVRAM non-volatile random access memory
OEM original equipment manufacturer
OS operating system
PAL 1. programmable array logic 2. phase altering line
PC personal computer
PCI peripheral component interconnect
PCM pulse code modulation
PCMCIA Personal Computer Memory Card International Association
PF parity flag
PIN personal identification number
PIO Programmed I/O
POST power-on self test
PROM programmable read-only memory
PTR pointer
RAM random access memory
RAS row address strobe
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
Continued
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Compaq Deskpro EN Series User manual

Category
Motherboards
Type
User manual
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