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1. PRESENTATION
By Soumyadip Maity
Roll-35001622067
Subject-Microprocessor And Micro
controller
Topic-Introduction to 8086

2.  INTRODUCTION
 8086 Microprocessor is an enhanced version of 8085Microprocessor that
was designed by Intel in 1976.
 It is a 16-bit Microprocessor having 20 address lines and16 data lines
that provides up to 1MB storage.
 It consists of powerful instruction set, which provides operations like
multiplication and division easily.

3.  Features of Intel - 8086 microprocessor
 It is a 16-bit microprocessor.
 8086 has a 20 bit address bus can access up to 220 memory locations (1 MB).
 It can support up to 64K I/O ports.•
 It provides 16-bit registers•
 It has multiplexed address and data bus AD0- AD15 and A16-A19.
INTEL-8086 MICROPROCESSOR

4.  MAIN FUNCTIONAL UNITS
 Bus Interface Unit (BIU):
• Handles instruction fetching, reading/writing memory, and computes
the 20-bitphysical address.
• Stores pre-fetched instructions in the instruction queue (6 bytes).
• Interfaces with memory and I/O devices.
 Execution Unit (EU):
• Decodes and executes instructions.
• Contains General Purpose Registers (AX, BX, CX, DX).
• Uses Arithmetic Logic Unit (ALU) for computations.
• Controls Flags to indicate results of operations

5.  Internal Architecture of 8086
• The BIU handles all transactions of data and addresses on the buses for EU
• The major reason for this separation is to increase the processing speed of the
processor.
BLOCK DIAGRAM OF 8086 MICROPROCESSOR

6.  Applications and Legacy
 Powered early personal computers like the IBM PC, establishing a
dominant platform.
 Laid the foundation for subsequent Intel x86 architectures (80286,
80386, etc.).
 Influenced the design of many modern microprocessors.
 Continues to be used in embedded systems and educational
contexts.
 Conclusion
The 8086 was a pivotal microprocessor that shaped the course of
computing history, paving the way for the powerful processors we use
today.

7. THANK YOU