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BCA-207N · Computer Organization and Architecture
Unit 1

Basic Organization, CPU Registers & Control Unit

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Basic Organization, CPU Registers & Control Unit

Official MJPRU BCA Unit 1: Basic Organization, CPU Registers & Control Unit for BCA-207N (Computer Organization and Architecture).

Syllabus Topics:Computer Organization vs Computer Architecture: Functional Structure vs Programmer-Visible AttributesVon Neumann Architecture & Stored Program Concept: Unified Memory for Code and Data, Sequential Fetch CycleComponents of a Digital Computer: Processing Unit, Memory Unit, Input/Output Subsystem, System BusMachine Instructions: Operation Codes (Opcodes), Operands, Addressing Information, Instruction Word FormatComputer Registers: Program Counter (PC), Memory Address Register (MAR), Memory Data Register (MDR/MBR)Instruction Register (IR), Accumulator (AC), Temporary Registers (TR), Input/Output Registers (INPR/OUTR)Common Bus System: Multiplexer-Based vs Tri-State Buffer Based Internal Bus InterconnectionsInstruction Execution Cycle: Fetch, Decode, Read Effective Address (Indirect Address Phase), Execute, Interrupt CheckRegister Transfer Language (RTL): Symbolic Representation of Microoperations (Arithmetic, Logic, Shift)Control Unit Architecture: Hardwired Control Unit (Combinational Logic, State Counters, Decoders, Fast Execution)Microprogrammed Control Unit: Control Memory (ROM), Control Address Register (CAR), Microinstruction Formats, FlexibilityGeneral Purpose Register (GPR) Organization: Register Set, Bus Multiplexers, ALU Interface, Control Word Structure
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Introduction to Computers & The IPO Cycle

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Topic 1 · The foundation of modern computing

Introduction to Computers & The IPO Cycle

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💡 The Big Picture:A computer is an electronic system that takes raw data as Input, processes it under programmed logic, and produces meaningful Information as Output.
🍪 Everyday Analogy:Think of baking cookies: Flour & Sugar (Input) ➔ The Oven (Processing) ➔ Warm Delicious Cookie (Output)! 🍪
Key Exam Takeaways
  • ·Data = Raw, unprocessed facts without context (e.g. 42, 'apple').
  • ·Information = Structured data with meaning (e.g. 'Temperature: 42°C').
  • ·Hardware is what you can touch; Software is the instructions running inside.
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Which of the following represents unprocessed raw facts?

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