Intel 80286 Chapter Overview of Numeric Processing, Unnormals-Descendents of Denormal Operands

TABLE OF CONTENTS

CHAPTER 1			Page
OVERVIEW OF NUMERIC PROCESSING
Introduction to the 80287 Numeric Processor Extension		.............................................	1-1
Performance		............ ...........	1-1
Ease of Use			1-2
Applications			1-3
Upgradability			1-4
Programming Interface		..... .........................................	1-5
Hardware Interface			1-6
80287 Numeric Processor Architecture			1-8
The NPX Register Stack	'		1-8
The NPX Status Word			1-9
Control Word			1-10
The NPXTag Word			1-12
The NPX Instruction and Data Pointers			1-12
Computation Fundamentals			1-14
Number System			1-14
Data Types and Formats			1-15
Binary Integers			1-17
Decimal Integers			1-17
Real Numbers			1-17
Rounding Control			1-18
Precision Control			1-19
Infinity Control			1-19
Special Computational Situations			1-20
Special Numeric Values		...............	1-21
Nonnormal Real Numbers			1-21
Denormals and Gradual Underflow			1-21
Unnormals-Descendents of Denormal Operands		...........................................	1-23
Zeros and Pseudo Zeros		..........................	1-24
Infinity			1-25
NaN (Not a Number)			1-25
Indefinite			1-29
Encoding of Data Types		........................	1-29
Numeric Exceptions			1-33
Invalid Operation			1-33
Zero Divisor			1-33
Denormalized Operand			1-34
Numeric Overflow and Underflow			1-34
Inexact Result			1-34
Handling Numeric Errors		.............................................	1-34
Automatic Exception Handling		..............................	1-37
Software Exception Handling			1-38
CHAPTER 2
PROGRAMMING NUMERIC APPLICATIONS
The 80287 NPX Instruction Set		;	2-1
Compatibility with the 8087 NPX			2-1
Numeric Operands			2-1
Data Transfer Instructions		.................	2-2
Arithmetic Instructions			2-4

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