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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