4 Address

Duration: 5 min

This video lesson is available to enrolled students.

Return to /learn/BIHAR-STET-COMPUTER-SCIENCE-COMPLETE-COURSE/unit-2-coa/instr-formats-modes/instruction-structure/asset-4-address after enrolling

Inside: a video lesson and guided study material.

Module outline

  1. About the course: About the Course
  2. Mathematical Aptitude: Number System, HCF LCM, Divisibility Rules, Percentage, Ratio and Proportion (Ratios), Average, Profit and Loss, Time and Work, Mensuration and Geometry, Simple Interest and Compound Interest, Speed Time and Distance, Age Problems, Mixture and Alligation, Algebra, Powers and Exponents (Surds and Indices), Pipe and Cistern, Trigonometry, Statistics, Data Interpretation, Arithmetic
  3. Logical Reasoning: Series (Number and Letter Series) (Numerical Relations and Reasoning), Coding Decoding, Analogy, Blood Relations, Directions (Direction Test), Ranking, Order and Sequence, Non Verbal Reasoning (Spatial Aptitude) (Spatial Reasoning) (Visual Reasoning), Seating Arrangements, Syllogisms, Venn Diagram, Puzzle Solving (Puzzles), Logical Sequence Of Words, Deductive and Inductive Reasoning (Logical Deduction and Induction) (Prepositional Reasoning), Analytical Reasoning (Counting Figures Reasoning), Cubes & Dices, Calendar, Clock
  4. General Knowledge: Physics, Chemistry, Biology, History, Geography, Polity, Indian Economy, GK- Current Affairs, Static General Knowledge
  5. Art of Teaching: Nature, Objectives & Characteristics of Teaching, Learners & Learning Process, Factors Affecting Teaching, Methods of Teaching, Classroom Management & Communication, Teaching-Learning Aids & ICT Integration, Evaluation, Assessment & Measurement, Professional Development & Ethics, Policies, Acts & Contemporary Issues, Curriculum & School Environment, Guidance, Counselling & Mental Health, Inclusive Education & Special Needs, Micro-Teaching & Teaching Skills, Lesson Planning
  6. Environmental Science: Environment
  7. Unit 1 | Digital Electronics: Digital Systems & Boolean Basics, Logic Gates & Hardware, Boolean Expression, Boolean Minimization, Combinational Circuit, Sequential Circuits, Number System, Number Representation
  8. Unit 2 | COA: Basics of COA, Floating Point Rep, Cache Memory Organization, Input Output Organisation, Instr Formats & Modes, Control Unit Design, Register Transfer and Microoperations, Programming the Basic Computer
  9. Unit 3 | C Programming: C Fundamentals, Control Flow, Functions, Arrays & Pointers, Storage Classes, Structures & Enums, DMA, Macros, Scoping & File Handling
  10. Unit 3 | Data Structures: Introduction to DS, Array, Stack, Queue, Linked List, Tree, Graphs, Hashing
  11. Unit 4 | Algorithms: Algorithm Analysis, Time Complexity Analysis, Sorting Algorithms, Dynamic Programming, Minimum Spanning Trees, Shortest Path Algos, Advanced Algorithms
  12. Unit 5 | Operating System: Introduction to OS, Process Management, CPU Scheduling, Process Synchronization, Threads & Process Creation, Deadlock, Memory Management, Virtual Memory, Disc Scheduling, File Management
  13. Unit 6 | Database Management System: Basics of DBMS, ER Diagram, Relational Model & Functional Dependencies, Keys & Integrity Constraints, Normalization (1NF - BCNF), Decomposition Properties & 4NF, File Organization & Indexing, Relational Algebra, SQL, Transaction Management, Concurrency Control
  14. Unit 7 | Computer Networks: Introduction to CN, Data Communication, DLL: Access Control, DLL: Flow Control, DLL: Error Control, DLL: Framing, Data Link Layer - Ethernet, Net Layer: IPv4 & Proto, Net Layer: IP Addressing, Net Layer:Routing Protocol, Transport Layer Services, TL: Congestion & UDP, Application Layer
  15. Unit 8 | Software Engineering: Fundamentals of Software Engineering, Software Requirements and Quality Assurance, Software Design, Estimation and Metrics, Software Testing, Software Maintenance and Configuration Management
  16. Unit 9 | Object Oriented Programming: OOPS with C++
  17. Unit 10 | Web Development: HTML Basics, CSS, JavaScript-Basics, XML
  18. Unit 11 | Theory Of Computation: Introduction to TOC, Deterministic FA (DFA), Non-Deterministic FA, Regular Expressions, Grammar, Regular Language Properties, Moore & Mealy Machines, Pushdown Automata & CFG, Turing Machines
  19. Unit 12 | IoT: Emerging Tech Trends, Cloud Computing
  20. Unit 13 | Artificial Intelligence: Approaches to AI, Search Algorithms, Game Playing, Knowledge Representation, Natural Language Processing, Artificial Neural Networks, Genetic Algorithms
  21. Unit 14 | E-Commerce: Electronic Data Interchange and E-Commerce, Role of Internet and Web Services, Security in Mobile and Wireless Computing, Physical Security and Cryptography Basics, Cyber Safety and Security
  22. Unit 15 | Multimedia: Multimedia
  23. Unit 16 | Python: Introduction to Python, Tokens, Variables, Data Types, I/O, Operators & Expressions, Control Flow & Looping, Collections & Strings, Functions & Modules, File Handling & Data Analysis, DSA using Python
  24. Full Length Mock Tests — General Paper:
  25. Full Length Mock Tests — Computer Science (Paper II):
AI summary & chapters

AI Summary

An AI-generated summary of this video lecture.

The lecture focuses on instruction formats in computer architecture, specifically detailing the structure and implications of a 4-address instruction format. The instructor explains that instructions are classified based on the number of operands or references made within them. The 4-address format is presented as a historical method used in early computers, characterized by a specific layout including mode/opcode, two operands, a result address, and the address of the next instruction. The session highlights the simplicity of this format as a primary advantage but notes its significant drawback regarding memory space consumption due to its length. The visual aids include a blue bar diagram and handwritten red annotations illustrating data flow.

Chapters

  1. 0:00 – 2:00 00:00-02:00

    The instructor introduces the topic "Instruction format" and explains that instructions are classified based on the number of operands or references made within them. The slide displays a diagram for a "4 Address Instruction" containing fields labeled "Mode/Opcode", "Op1", "Op2", "Result", and "Next Instruction". The text on the slide states that in early computers, these instructions were used where the first part represents mode and opcode, followed by four addresses. The instructor verbally confirms this structure, noting that the instruction includes the address of the next instruction to be executed. He emphasizes that this format was common in early computing eras before more compact formats were developed. The slide text explicitly mentions "In early computer we have used these four-address instructions".

  2. 2:00 – 4:35 02:00-04:35

    The instructor elaborates on the pros and cons of the 4-address instruction format. The slide lists "Advantage" as "Very simple, easy to use easy to understand" and "Disadvantage" as "Very lengthy and occupied a lot of space". To illustrate, the instructor draws red annotations on the screen, writing the equation "c = a + b" above the diagram. He circles the "Mode/Opcode", "Op1", "Op2", "Result", and "Next Instruction" fields. He draws arrows indicating data flow, labeling operands 'a' and 'b' and the result 'c', demonstrating how the instruction fetches operands and stores the result while explicitly pointing to the next instruction address. He underlines the text "address of the next instruction" to reinforce that the instruction pointer is part of the instruction itself, making it self-contained but large. He also underlines "number of operands or reference made in the instructions" at the top.

The lesson progresses from defining the classification criteria for instruction formats to a deep dive into the specific mechanics of the 4-address instruction. By visually mapping the fields and drawing data flow arrows, the instructor clarifies how operands are fetched and results stored in a single instruction cycle. The discussion concludes by weighing the pedagogical simplicity of the format against its practical inefficiency in terms of memory usage, providing a balanced view of its historical context and limitations. The handwritten notes serve as a practical example of how a simple arithmetic operation would be encoded in this verbose format, showing that while easy to understand, it consumes significant memory space for every single instruction.

Loading lesson…