Compaq AlphaPC 264DP Technical Reference Manual page 10

Manual Organization
This manual includes the following chapters, an appendix, and an index.
Chapter 1, AlphaPC 264DP Introduction, is an overview of the AlphaPC 264DP,
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including its components, features, and uses.
Chapter 2, System Configuration and Connectors, describes the user-environ-
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ment configuration, board connectors and functions, and switch functions. It also
identifies switch settings and connector locations.
Chapter 3, Power and Environmental Requirements, describes the AlphaPC
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264DP power and environmental requirements and provides board dimensions.
Chapter 4, Functional Description, provides a functional description of the
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AlphaPC 264DP mainboard, including the 21272 core logic chipset, L2 backup
cache (Bcache) and memory subsystems, system interrupts, clock and power
subsystems, and peripheral component interconnect (PCI) and Industry Standard
Architecture (ISA) devices.
• Chapter 5, System Memory and Address Mapping, describes how to upgrade the
AlphaPC 264DP mainboard's SDRAM memory.
• Appendix A, Support, Products, and Documentation, lists sources for compo-
nents and accessories not included with the AlphaPC 264DP, describes how to
obtain COMPAQ information and technical support, and how to order COMPAQ
products and associated literature.
Conventions
This section defines product-specific terminology, abbreviations, and other conven-
tions used throughout this manual.
Abbreviations
Register Access
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The following list describes the register bit and field abbreviations:
Bit/Field Abbreviation
RO (read only)
RW (read/write)
WO (write only)
x
Description
Bits and fields specified as RO can be read but not written.
Bits and fields specified as RW can be read and written.
Bits and fields specified as WO can be written but not read.
12 February 1999 – Subject To Change