Input Output Programming

Duration: 6 min

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Inside: a video lesson and guided study material.

Module outline

  1. About the Course: About the Course
  2. Section 1 | Language (Hindi): भाषा, लिपि, ध्वनि, वर्ण, अक्षर, स्वर, व्यंजन, मात्रा और संयुक्ताक्षर, वर्तनी, वर्ण-विन्यास, अनुस्वार, अनुनासिक, चंद्रबिंदु और ‘र’ के रूप, शब्द, पद और शब्द-भेद, संज्ञा और सर्वनाम, विशेषण और क्रिया, लिंग, वचन, पुरुष और कारक, काल, वाच्य, वाक्य और वाक्य-भेद, संधि, समास, विलोम शब्द, पर्यायवाची शब्द, सामान्य अशुद्धियाँ, अनेक शब्दों के लिए एक शब्द, मुहावरे और लोकोक्तियाँ, अपठित गद्यांश और अपठित पद्यांश, Multi-Topic Content (Cross-Concept Material), वर्णमाला
  3. Section 1 | Language (उर्दू भाषा — 22 प्रश्न (निश्चित)): Spelling & Diacritics, Grammar (اسم, فعل, صفت, ضمیر), Vocabulary, Idioms & Proverbs, Comprehension
  4. Section 1 | Language (বাংলা / बांग्ला भाषा — 22 प्रश्न (निश्चित)): Bangla Script and Sounds, Bangla Grammar and Usage, Bangla Word Formation and Vocabulary, Reading and Text Interpretation
  5. Section 1 | Language (English): Vocabulary, Noun, Subject Verb Agreement (Verb Noun Agreement), Adjectives, Tenses, Pronoun, Verb, Adverb, Preposition, Articles, Determiner, Conjunction, Modals, Active Passive Voice (Voice), Direct and Indirect Speech, Sentence Correction (Error Correction), Sentence Completion (Fill in the blanks), Sentence Construction, Sentence Re-arrangements (Para Jumbles) (Narrative Sequencing), Comprehension / Reading Comprehension / Unseen Passages (Critical Reasoning) (Paragraph Questions), Cloze Test (Cloze Passage), Verbal Analogy (Word Based Analogy), Facts, Inference and Judgements
  6. Section 2 | Primary Maths & Reasoning: Ratio and Proportion (Ratios), Divisibility Rules, Mixture and Alligation, Permutation and Combination, Number System, HCF LCM, Sequence and Series (Series), Speed Time and Distance, Series (Number and Letter Series) (Numerical Relations and Reasoning), Coding Decoding, Non Verbal Reasoning (Spatial Aptitude) (Spatial Reasoning) (Visual Reasoning), Percentage, Average, Profit and Loss, Simple Interest and Compound Interest, Time and Work, Mensuration and Geometry, Age Problems, Arithmetic, Powers and Exponents (Surds and Indices), Algebra, Probability, Trigonometry, Syllogisms, Seating Arrangements, Blood Relations, Directions (Direction Test), Analytical Reasoning (Counting Figures Reasoning), Puzzle Solving (Puzzles), Calendar, Clock, Cubes & Dices, Venn Diagram, Data Arrangement, Inequality, Analogy, Ranking, Order and Sequence
  7. Section 2 | General Awareness (GK + Current Affairs): Polity, Physics, Biology, State Wise GK, Chemistry, History, Geography, Indian Economy, Environment, GK- Current Affairs, Static General Knowledge
  8. Section 3 | Computer System and Org. (CSO): Basics of COA, Floating Point Rep, Cache Memory Organization, Instr Formats & Modes, Programming the Basic Computer, Input Output Organisation, Register Transfer and Microoperations, Control Unit Design
  9. Section 3 | Database Management System: Basics of DBMS, ER Diagram, Relational Model & Functional Dependencies, Keys & Integrity Constraints, Normalization (1NF - BCNF), Decomposition Properties & 4NF, SQL, File Organization & Indexing, Relational Algebra, Relational Calculus, Transaction Management, Concurrency Control
  10. Section 3 | Operating System: Introduction to OS, Process Management, CPU Scheduling, Threads & Process Creation, Memory Management, Virtual Memory, Disc Scheduling, File Management, Process Synchronization
  11. Section 3 | Computer Networks: Introduction to CN, Data Communication, DLL: Access Control, DLL: Flow Control, DLL: Error Control, Data Link Layer - Ethernet, Net Layer: IPv4 & Proto, Net Layer: IP Addressing, Transport Layer Services, TL: Congestion & UDP, Application Layer, Hardware basics
  12. Section 3 | Data Structures: Introduction to DS, Array, Stack, Queue, Linked List, Tree, Graphs, Hashing, Algorithm Analysis, Time Complexity Analysis, Sorting Algorithms, Greedy Algorithms, Minimum Spanning Trees, Shortest Path Algos
  13. Section 3 | Theory Of Computation & Compiler Design: Introduction to TOC, Deterministic FA (DFA), Non-Deterministic FA, Regular Expressions, Grammar, Regular Language Properties, Moore & Mealy Machines, Pushdown Automata & CFG, Turing Machines, Intro to Compilers, Lexical Analysis, Grammar & CFG, Syntax Analysis: Top-Down, Syntax Analysis: Bottom-Up, Semantic Analysis & SDT, Intermediate Code Gen, Code Optimization
  14. Section 3 | Emerging Trends (AI, Societal Ethics & MS Office): Artificial Intelligence, Emerging Tech Trends, Society, Law & Ethics, MS Office Applications
  15. Section 3 | Software Engineering: Fundamentals of Software Engineering, Software Requirements and Quality Assurance, Software Design, Estimation and Metrics, Software Maintenance and Configuration Management, Software Testing
  16. Section 3 | C Programming: C Fundamentals, Control Flow, Functions, Arrays & Pointers, Storage Classes, Structures & Enums, DMA, Macros, Scoping & File Handling
  17. Section 3 | OOPS, C++, JAVA, HTML: OOPS with C++, Java, HTML Basics, CSS
  18. Section 3 | Java: Java Fundamentals, Array, String, IO & References
  19. Section 3 | Python: Introduction to Python, Tokens, Variables, Data Types, I/O, Operators & Expressions, Control Flow & Looping, Collections & Strings, Functions & Modules, File Handling & Data Analysis
  20. Section 3 | Digital Electronics: Digital Systems & Boolean Basics, Logic Gates & Hardware, Boolean Expression, Boolean Minimization, Combinational Circuit, Sequential Circuits, Number System, Number Representation
  21. Section 3 | Multimedia: Multimedia
  22. BPSC Previous Year Papers:
  23. BPSC Full Mock Tests:
AI summary & chapters

AI Summary

An AI-generated summary of this video lecture.

This educational video provides a detailed walkthrough of input-output programming for a basic computer, using assembly-like code examples. The lecture begins by defining the purpose of I/O programs: to write symbols to memory and print them from memory. It then presents two main code segments: (a) Input a character, which uses a loop to check an input flag (CIF) and, when set, reads a character via INP and stores it in a memory location (CHR); and (b) Output one character, which loads a character from memory (CHR) into the accumulator (AC) and prints it via OUT. The video also displays a table of the computer's instruction set, explaining key instructions like SKI (check input flag), BUN (branch unconditionally), INP (input character), OUT (output character), and STA (store accumulator). The instructor uses on-screen annotations to highlight key lines of code and explain the logic of the programs, such as the flag-based polling mechanism for I/O operations.

Chapters

  1. 0:00 – 2:00 00:00-02:00

    The video opens with a slide titled 'Input Output Programming'. The instructor explains that I/O programs are needed for writing symbols to memory and printing them. The slide displays two code segments: (a) 'Input a character' and (b) 'Output one character'. The first segment shows a loop using SKI to check the input flag (CIF). If the flag is 0, it branches back to check again. If the flag is 1, it executes INP to input a character, OUT to print it, and STA CHR to store it. The second segment shows LDA CHR to load a character into the accumulator (AC), followed by a loop using COF to check the output flag. If the flag is 0, it branches to check again. If the flag is 1, it executes OUT to print the character and HLT to halt. The code concludes with a memory location CHR storing the character 'W' (HEX 0057).

  2. 2:00 – 5:00 02:00-05:00

    The instructor continues to explain the code, focusing on the input program. He points out that the SKI instruction checks the input flag (CIF). If the flag is 0, the BUN CIF instruction branches back to the beginning of the loop to check again. When the flag becomes 1, indicating input is ready, the program proceeds to INP to read the character, OUT to print it, and STA CHR to store it in memory. He then moves to the output program, explaining that LDA CHR loads the character 'W' from memory into the accumulator (AC). The COF instruction checks the output flag (COF). If the flag is 0, the BUN COF instruction branches back to check again. When the flag becomes 1, the OUT instruction prints the character, and HLT halts the program. The instructor emphasizes that the flag is used to poll the I/O device's status, ensuring the program only proceeds when the device is ready.

  3. 5:00 – 5:34 05:00-05:34

    The video transitions to a slide titled 'Instruction Set of the Basic Computer'. This slide presents a table with columns for Symbol, Hex code, and Description. The instructor explains that this table defines the basic instructions of the computer. He points to specific instructions like SKI (F100), which skips the next instruction if the input flag is on, and COF (F000), which skips the next instruction if the output flag is off. He also explains that INP (F400) inputs information and clears the flag, while OUT (F800) outputs information and clears the flag. The table also includes other instructions like LDA (2 or 8), STA (3 or 9), and BUN (4 or C).

The video provides a comprehensive overview of fundamental input-output programming concepts for a basic computer architecture. It demonstrates how to implement character input and output using a polling mechanism, where the program repeatedly checks a status flag (CIF or COF) to determine if an I/O device is ready. The core of the lesson is the use of conditional branch instructions (BUN) to create a loop that waits for the flag to change state. The instructor effectively uses the provided code examples and the instruction set table to explain the function of each instruction, such as SKI, COF, INP, and OUT, and how they interact to perform I/O operations. The key takeaway is the concept of status flags as a means of synchronization between the CPU and I/O devices, a foundational principle in computer architecture.

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