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Technical Reference Guide Technical Reference Guide For the Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors This hardcopy 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 EN Series of Personal Computers Desktop and Minitower Form Factors TRG Reader Feedback Please feel free to send any questions, suggestions, corrections, or comments regarding this document please to the following email address: [email protected] When responding, please state the title of the referenced document. Technical Reference Guide 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 Compaq Deskpro EN Series of Personal Computers i Desktop and Minitower Form Factors Third Edition - September 1998 Technical Reference Guide ii Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors Third Edition–- September1998 Technical Reference Guide TABLE OF CONTENTS CHAPTER 1 INTRODUCTION............................................................................................................. 1.1 ABOUT THIS GUIDE ........................................................................................................... 1-1 1.1.1 USING THIS GUIDE ..................................................................................................... 1-1 1.1.2 ADDITIONAL INFORMATION SOURCES.................................................................. 1-1 1.2 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 Compaq Deskpro EN Series of Personal Computers iii Desktop and Minitower Form Factors Third Edition - September 1998 Technical Reference Guide 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..............................................................................................
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