8085 Coding

Learn to write programs for Intel 8085 processor in Assembly and run it on simulator

26 Participants 30 Minutes Beginner

Welcome to the 8085 Microprocessor Assembly Programming Lab, a journey into low-level programming and computer architecture. In this hands-on experience, we'll master assembly programming through three programs covering arithmetic, conditional branching, and iterative calculations. These skills are fundamental for embedded systems and computer engineering. Let's explore the world of assembly programming!



Before embarking on the 8085 Microprocessor Assembly Programming lab, students should have a foundational understanding of digital logic, computer architecture, and basic assembly language concepts. Familiarity with binary and hexadecimal numbering systems is also helpful.



What is the 8085 Microprocessor?

The 8085 microprocessor is an 8-bit microprocessor introduced by Intel in the mid-1970s. It was widely used in early microcomputer systems and is known for its simplicity and versatility. Assembly programming for the 8085 involves writing low-level instructions to perform various tasks, making it a fundamental skill for computer engineers and embedded systems developers.


Programming the 8085:

In this lab, students will learn to write assembly programs for the 8085 microprocessor. Three key programs will be explored:


Program I: Add Two 8-Bit Numbers

  • Description: This program instructs the 8085 microprocessor to add two 8-bit numbers stored in memory locations and display the result.

  • Advantages: Teaches fundamental arithmetic operations, memory manipulation, and I/O interfacing.

  • Challenges: Handling carry bits during addition, ensuring proper addressing, and managing limited memory space.


Program II: Compare Two Numbers and Find the Greater Number

  • Description: This program compares two numbers and determines which is greater, showcasing conditional branching in assembly.

  • Advantages: Demonstrates control flow using conditional statements and decision-making in assembly language.

  • Challenges: Implementing branching logic, managing flags, and addressing for comparison.


Program III: Calculate the Factorial of a Number

  • Description: This program calculates the factorial of a number, emphasizing loops and repetitive operations.

  • Advantages: Illustrates the use of loops for iterative calculations and variable storage.

  • Challenges: Proper loop management, memory allocation, and avoiding stack overflow.


Lab Benefits:

  • Hands-On Learning: Writing assembly programs for the 8085 microprocessor provides hands-on experience with low-level programming, enhancing understanding of computer architecture.

  • Foundation for Embedded Systems: Mastery of assembly programming is essential for embedded systems development and firmware design.

  • Problem Solving: Solving practical problems using assembly language sharpens problem-solving skills and logical thinking.

  • Understanding Hardware: Students gain insight into how software interacts with hardware components in a computer system.


Refer to these to learn more:

  1. Microprocessor Tutorials - GeeksforGeeks



The 8085 Microprocessor Assembly Programming lab equips students with vital skills in low-level programming and computer architecture. It serves as the foundation for understanding microcontrollers, embedded systems, and real-time systems. By writing programs that perform basic arithmetic, make decisions, and execute loops, students gain a strong grasp of assembly language concepts and their applications. This lab fosters critical thinking and problem-solving abilities, preparing students for a wide range of careers in computer engineering and embedded systems development.

Note: The lab provides the necessary assembly code for the programs, allowing students to focus on understanding the logic, execution flow, and practical applications of 8085 assembly programming.


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