Preface
This publication describes the various components of the IBM
Personal Computer XT and IBM Portable Personal Computer;
and the interaction of each.
The information in this publication
is
for reference, and
is
intended for hardware and program designers, programmers,
engineers, and anyone else with a knowledge of electronics
and/
or
programming who needs to understand the design
and
operation of the IBM Personal Computer XT or IBM Portable
Personal Computer.
This publication consists of two parts: a system manual and an
options and adapters manual.
.The system manual
is
divided into the following sections:
Section 1, "System Board", discusses the component layout,
circuitry, and function of the system board.
Section 2, "Coprocessor", describes the Intel 8087
coprocessor and provides programming and hardware
interface information.
Section 3,
"Power
Supply", provides electrical
input/output
specifications as well as theory of operation for
both
the IBM
Personal Computer
XT
power supply and the IBM Portable
Personal Computer power supply.
Section 4, "Keyboard", discusses the hardware makeup,
function, and layouts
of
the IBM Personal Computer
XT
83-keyand lOl/102-key keyboards and the IBM Portable
Personal Computer keyboard.
In
addition, keyboardencod-
ing and usage
is
discussed.
Section 5, "System Bios", describes the basic
input/output
system
and
its use. This section also contains the software
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