BCA-207N · Computer Organization and Architecture
Unit 4
Input/Output Organization, Interfaces & Data Transfer Modes
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Unit 4 Learning Hub
Input/Output Organization, Interfaces & Data Transfer Modes
Official MJPRU BCA Unit 4: Input/Output Organization, Interfaces & Data Transfer Modes for BCA-207N (Computer Organization and Architecture).
Syllabus Topics:Peripheral Devices: Input Devices, Output Devices, Electromechanical vs Electronic Operating SpeedsI/O Interface: Need for Interface (Speed Discrepancy, Data Format Differences, Operating Mode Disparities)I/O Bus vs Memory Bus: Isolated I/O (Separate I/O Instructions, IN/OUT) vs Memory-Mapped I/O (Unified Address Space)Asynchronous Data Transfer: Strobe Control Protocol (Source-Initiated vs Destination-Initiated Strobe)Handshaking Data Transfer Protocol: Source-Initiated vs Destination-Initiated Two-Way Handshake with Timing DiagramsModes of Data Transfer: Programmed I/O (Polling Loop, Inefficient CPU Busy-Waiting)Interrupt-Initiated I/O: Hardware Interrupt Signal, Interrupt Service Routine (ISR), Context SavingPriority Interrupt System: Daisy-Chaining Priority Resolution (Hardware Serial Connection)Parallel Priority Interrupt: Priority Encoder, Mask Register, Interrupt Status RegisterDirect Memory Access (DMA): Need for DMA in Block Transfers, Stealing CPU Bus Cycles (Cycle Stealing vs Burst Mode)DMA Controller (DMAC) Internal Architecture: Address Register, Word Count Register, Control Register, Bus Grant (BG)Input-Output Processor (IOP): Dedicated I/O Channels, Autonomous Channel Programs, Mainframe ArchitectureSerial Communication Protocols: Synchronous vs Asynchronous Serial Transmission, Baud Rate, Parity, Start/Stop Bits
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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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