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Technical Reference Guide
Compaq Deskpro 4000N and 4000S Personal Computers
First Edition - September1997
4-1
Chapter 4
SYSTEM SUPPORT
4.
Chapter 4 SYSTEM SUPPORT
4.1
INTRODUCTION
This chapter covers subjects dealing with basic system architecture and covers the following
topics:
♦ PCI bus overview (4.2) page 4-2
♦ ISA bus overview (4.3) page 4-11
♦ System clock distribution (4.4) page 4-23
♦ Real-time clock and configuration memory (4.5) page 4-24
♦ I/O map and register accessing (4.6) page 4-41
♦ System management support (4.7) page 4-44
This chapter covers functions provided by off-the-shelf chipsets and therefore describes only basic
aspects of these functions as well as information unique to the Compaq Deskpro 4000 Personal
Computers. For detailed information on specific components, refer to the applicable
manufacturer’s documentation.