IBM 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, four of which describe the
hardware aspects of the IBM Personal Computer AT including
signal charts and register information. 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
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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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