IBM 6589 Information Manual - Page 9

Preface

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Preface This Technical Information Manual provides information for the IBM PC 365 (Type 6589). It is intended for developers who want to provide hardware and software products to operate with this IBM computer and provides a more in-depth view of how this computer works. Users of this publication should have an understanding of computer architecture and programming concepts. Manual Style Warning: The term reserved describes certain signals, bits, and registers that should not be changed. Use of reserved areas can cause compatibility problems, loss of data, or permanent damage to the hardware. When the contents of a register are changed, the state of the reserved bits must be preserved. When possible, read the register first and change only the bits that must be changed. In this manual, some signals are abbreviated. A minus sign in front of the signal indicates that the signal is active low. No sign in front of the signal indicates that the signal is active high. The use of the letter "h" indicates a hexadecimal number. Also, when numerical modifiers such as "K", "M" and "G" are used, they typically indicate powers of 2, not powers of 10. For example, 1 KB equals 1 024 bytes (2 10), 1 MB equals 1 048 576 bytes (2 20), and 1 GB equals 1 073 741 824 bytes (230). When expressing storage capacity, MB equals 1 000 KB (1 024 000). The value is determined by counting the number of sectors and assuming that every two sectors equals 1 KB. Note: Depending on the operating system and other system requirements, the storage capacity available to the user might vary. © Copyright IBM Corp. 1996, 1997 vii

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Preface
This
Technical Information Manual
provides information for the IBM PC
365 (Type
6589).
It is intended
for developers who want to provide hardware and software products to operate with this IBM computer
and provides a more in-depth view of how this computer works.
Users of this publication should have an
understanding of computer architecture and programming concepts.
Manual Style
Warning:
The term
reserved
describes certain signals, bits, and registers that should not be changed.
Use of reserved areas can cause compatibility problems, loss of data, or permanent damage to the
hardware.
When the contents of a register are changed, the state of the reserved bits must be preserved.
When possible, read the register first and change only the bits that must be changed.
In this manual, some signals are abbreviated.
A minus sign in front of the signal indicates that the signal
is active low.
No sign in front of the signal indicates that the signal is active high.
The use of the letter “h” indicates a hexadecimal number.
Also, when numerical modifiers such as “K”,
“M” and “G” are used, they typically indicate powers of 2, not powers of 10.
For example, 1 KB equals
1 024 bytes (2
10
), 1 MB equals 1 048 576 bytes (2
20
), and 1 GB equals 1073741824 bytes (2
30
).
When expressing storage capacity, MB equals 1 000 KB (1 024 000).
The value is determined by counting
the number of sectors and assuming that every two sectors equals 1 KB.
Note:
Depending on the operating system and other system requirements, the storage capacity available
to the user might vary.
Copyright IBM Corp. 1996, 1997
vii