IBM AT 5170 Technical Reference page 7

Preface
This manual describes the various units of the IBM Personal
Computer AT and how they interact.
It
also has information
about the basic input/output system (BIOS) and about
programming support.
The information in this publication is for reference, and is
intended for hardware and program designers, programmers,
engineers, and anyone else who needs to understand the design
and operation of the IBM Personal Computer AT.
This manual consists of nine sections:
• The first three sections describe the hardware aspects of the
IBM Personal Computer AT including signal charts and
register information.
• Section 4 describes keyboard operation, the commands to
and from the system, and the various keyboard layouts.
• Section 5 contains information about the usage of BIOS and
a system BIOS listing.
• Section 6 contains instruction sets for the 80286
microprocessor and the 80287 math coprocessor.
• Section 7 provides information about characters, keystrokes,
and colors.
• Section 8 has general communications information.
• Section 9 contains information about the compatibility of the
IBM Personal Computer AT and the rest of the IBM
Personal Computer family.
A glossary of terms and a bibliography of related publications are
included.
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