Rivier College, CS699A Professional Seminar
Fall 1999
Comparison of Intel Microprocessor
8086, 386, 486, Pentium II
by Hong Li
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Introduction
Computer technology has made incredible progress in the past
half century. In 1945, there were no stored-program computers.
Today, a few thousand dollars will purchase a personal
computer that has more performance, more main memory, and
more disk storage than a computer bought in 1965 for $1
million. During the first 25 years of electronic computers, both
forces made a major contribution; but beginning in about 1970,
computer designers became largely dependent upon integrated
circuit technology. The late 1970s saw the emergence of the
microprocessor.
• What is a microprocessor ?
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The Intel 8086 Microprocessor
It is a 16-bit microprocessor chip available in speeds
of 8MHz, 10MHz, and 12MHz.
It can address 1 Mb of data with only 16-bit address.
This is accomplished by segmenting memory into
separate 64K groups of data. Hardware and
instructions integral to the 8086 control each 64K
group.
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The Intel 8086 Microprocessor
(continued)
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Memory Structure
Data storage in 8086 memory
Paragraphs
Program Segmentation and Segment Registers
Hardware Registers
Flags
Input/Output (I/O) Structure
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Intel 386 Microprocessor
It is an entry-level 32-bit microprocessor designed for singleuser applications and operating systems such as MS-DOS and
Windows.
Base Architecture the Intel 386 consists of three major
components:
• a central processing unit (CPU)
• a memory management unit
-- segmentation unit
-- the paging mechanism
the Intel has two modes of operation: Real Address Mode
(Real Mode), and Protected Virtual Address Mode (Protected
Mode).
• a bus interface
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Intel 386 Microprocessor (continued)
Registers
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Intel 386 Microprocessor (continued)
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Intel 386 Microprocessor (continued)
• Instruction Set
The instruction set is divided into nine categories of
operations
• Addressing Modes
The Intel 386 provides a total of 11 addressing modes
for instructions to specify operands
• Memory organization
– I/O Space
– Real Mode Architecture
– Protected Mode Architecture
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Intel 486 microprocessor
The Intel 486 CPU offers the highest performance for
DOS, OS/2, Windows, and UNIX system V/Intel 386
applications. Its 100% binary compatible with the Intel
386 CPU.
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Architectural Overview
Real Mode Architecture.
Protected Mode Architecture
On-Chip Cache
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Pentium II Microprocessor
The Pentium II processor features and benefits can
enhance user’s computing experience:
Introduction, Product Highlights,Dynamic Execution
Technology, Intel MMX Technology, Thesting and
Performance Monitioring Features.
 Introduction
 Product Highlights
 Testing and Performance Monitoring Features
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Summary
 The Intel 8086 It is a 16-bit architecture, with
all internal registers 16 bits wide.
 The Intel 80386 were included a 32-bit data bus
structure and the ability to address up to 4GB of
memory.
 The Intel 80486 was a 32-bit data bus structure,
and the ability to address up to 64GB of
memory.
 The Pentium II processor was a 7.5 milliontransistor, it incorporates the Pentium pro and
the Intel MMX technology, which is designed
specifically to process video, audio and
graphics data efficiently.
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References:
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--http://www.tasc.com/products/horizonmaster/HTML/irm/in/intel/init/html/intel486.htm
--http://www.tasc.com/products/horizonmaster/HTML/irm/in/intel/init/html/intel386.htm
--http://www2.eng.cam.ac.uk/~dmh/d7/resource/intro/tsld012.htm
--http://www2.eng.cam.ac.uk/~dmh/d7/resource/intro/tsld013.htm
--http://developer.intel.com/design/processor/future/roadmap.htm
--http://developer.intel.com/design/processor/future/overview.htm
--http://intel.com/pentiumii/xeon/home.htm
--http://intel.com/PentiumIII/Xeon/home.htm
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David A. Patterson & John L. Hennessy, "Computer Architecture a
Quantitative Approach,“ 2nd edition, pp. 1-3, pp. D1- D14.
"Intel Microprocessor: Volume I", 1994, Pg 1-1---1-66, Pg 3-1---3-30.
"Intel Microprocessor: Volume II", 1994, Pg 2-2, Pg 2-2---2-85.
Robert S. Lai, "Writing MS-DOS Device Drivers", 2nd edition, The Waite
Group, pp. 461- 474.
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