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Intel 80287 User Manual
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DOMESTIC
DISTRIBUTORS
ALABAMA
Arrow
Bectronlcs.
Inc.
1015
Henderson
Road
Huntsville
35805
Tel:
(205)837-6955
Klerulff
8ectronics,
Inc.
4134
E.
Wood
Street
Phoenix
85040
Highway
PhOenix
85023
Tel:
(602)
866-2888
CAUFORNIA
Arrow
Electronics,
Inc.
19748
Dearborn
Street
Chatsworth
91311
Arrow
Electronics,
Inc.
1502
Crocker
Avenue
Arrow
Electrontcs.
Inc.
oun
Inc.
Arrow
Electronics,
Inc.
2961
Dow
AYilnue
Tustin
92680
Sacramento
95834
Tet
(9'6)
920-3'eo
Tel:
(714)
989--9411
Hamilton
Electro
Sales
9B5O
De
SolO
Avenue
Chatsworth
913"
(818)
700-6500
CAUFORNIA
(Cont'd)
Haminon
Electro
Sales
1381
B
West
190th
Street
Gardena
90248
Tel:
(213)
558·2131
Costa
Mesa
92626
Klarul"
Electronics,
Inc.
Ter
(7'4)
221).6300
lKlerulff
Bectronics,
Inc.
tKlaNlff
Electronics,
me.
14101
Franklin
Avenue
T
uslin
92680
Avenue
Irvine
92750
Avenue
Garden
Grove
92641
COLORADO
Arrow
Electronics,
Inc.
1390
S.
Potomac
Street
Suite
136
Aurora
80012
Tel:
(303)
698-1111
tWyle
Distribution
Group
4151
E.
124th
Avenue
Thornton
80241
tMicrocomputer
System
Technical
Dtttrlbutor
Centers
CONNECTICUT
Inc.
06492
Hamllton/Avnet
Electronics
Commerce
Industrial
Park
Commerce
Drive
06810
FLORIDA
GEORGIA
Suite
A
Norcross
30071
Pioneer
Electronics
3100
F.
Northwood.
Place
Norcross
30071
ILUNOIS
tArrow
ElectTonlca,
Inc.
2ODO
E.
/donqu",
.....
SchaumberJ,60195
T
Hamllton/Avnet
ElectroniCs
130
Thornelale
Avenue
Bensenville
60106
Itasca
Tel:
(31
250-0500
ILLINOIS
(Conl'd)
Itasca
60143
Tel:
(312)
773-2300
tPioneer
Electronics
1551
Carmen
Drive
Elk
Grove
60007
INDIANA
H
IndianapOlis
46241
Carmel
46032
46250
KANSAS
Pioneer
Electronics
10551
Lackman
Rd.
Lenexa
66215
Tel:
(913)
492-0500
KENTUCKY
MARYLAND
Arrow
Electronics,
Inc.
8300
Gulford
Road
#H
Rivera
Center
Columbia
21046
tMesa
TechnOlogy
Corp.
9720
Patuxentwci6d
Dr.
COlumbia
21046
MASSACHUSETiS
UTI
A".t.m.
RIIII
••
13
Fortune
Drive
Billerica
01821
MICHIGAN
Pioneer
Electronics
4505
Broadmoor
Ave.
S.E.
Granel
Rapids
49508
Tel:
(616)
555-1800
MINNESOTA
Minnetonka
55343
MISSOURI
Kterulff
Electronics,
Inc.
11804
Borman
Dr.
St.
Luis
63146
Tel:
(314)
997-4956
NEW
HAMPSHIRE
Manchester
031
03
NEWJERSI!Y
tHamllton/Avnet
Electronics
1
Kevstone
Avenue
08003
CCH/IO/87
pcjs.org
511
513
Table of Contents
Table of Contents
14
Implied Segment Usage by Index, Pointer, and Base Registers
40
Segment Register Selection Rules
45
Status Flags' Functions
62
Control Flags' Functions
63
Interpretation of Conditional Transfers
76
Interrupt Processing Order
104
Dedicated and Reserved Interrupt Vectors in Real Address Mode
106
Processor State after RESET
107
Addressing Segments of a Module Within a Task
129
Descriptor Cache Registers
130
Code and Data Segments Assigned to a Privilege Level
135
Selector Fields
137
Segment Access Rights Byte Format
137
Access Byte Examples
138
Allowed Segment Types in Segment Registers
138
Pointer Privilege Stamping
140
Gate Descriptor Format
143
Call Gate Checks
144
Call Gate
145
Stack Contents after an Inter-Level Call
147
Inter-Level Return Checks
148
Task State Segment and TSS Registers
152
TSS Descriptor
154
Checks Made During a Task Switch
156
Effect of a Task Switch on BUSY and NT Bits and the Link Word
157
Task Gate Descriptor
158
Task Switch through a Task Gate
159
Interrupt Descriptor Table Definition
163
Trap/Interrupt Gate Descriptors
166
Stack Layout after an Exception with an Error Code
167
Trap and Interrupt Gate Checks
168
Interrupt and Gate Interactions
169
Interrupt Descriptor Table Definition
180
Data Type for Global Descriptor Table and Interrupt Descriptor Table
181
Expand-Down Segment
190
Dynamic Segment Relocation and Expansion of Segment Limit
191
Example of NPX Context Switching
194
Table Title Page
350
Comparison Instructions
402
Transcendental Instructions
404
Constant Instructions
406
Processor Control Instructions
407
Instruction Set Reference Information
413
Instruction Execution Time
413
Bus Transfers
414
Instruction Length
415
Programming Facilities
430
High-Level Languages
430
Asm286
432
Defining Data
432
Records and Structures
433
Addressing Modes
434
80287 Emulation
437
Concurrent Processing with the 80287
437
Managing Concurrency
440
Instruction Synchronization
440
Data Synchronization
441
Error Synchronization
442
Incorrect Error Synchronization
444
Proper Error Synchronization
444
System-Level Numeric Programming
445
80287 Architecture
447
Processor Extension Data Channel
447
Real-Address Mode and Protected Virtual-Address Mode
447
Dedicated and Reserved I/O Locations
448
Processor Initialization and Control
448
System Initialization
448
Recognizing the 80287 NPX
448
Configuring the Numerics Environment
450
Initializing the 80287
451
80287 Emulation
451
Handling Numeric Processing Exceptions
452
Simultaneous Exception Response
453
Exception Recovery Examples
453
Conditional Branching Examples
457
Exception Handling Examples
459
Floating-Point to ASCII Conversion Examples
463
Function Partitioning
470
Exception Considerations
471
Special Instructions
471
Description of Operation
471
Scaling the Value
472
In Scaling
472
Avoiding Underflow and Overflow
472
Final Adjustments
473
Output Format
473
Trigonometric Calculation Examples
473
FPTAN and FPREM
473
Cosine Uses Sine Code
474
Machine Instruction Encoding and Decoding
481
Compatibility between the 80287 Npx and the 8087
489
Implementing the Ieee P754 Standard
493
Options Implemented in the 80287
495
Areas of the Standard Implemented in Software
495
Additional Software to Meet the Standard
496
Glossary of 80287 and Floating-Point Terminology
499
Index
507
4
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Intel 80287 Specifications
General
Brand
Intel
Model
80287
Category
Computer Hardware
Language
English
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