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ICT Compulsory 2 Hardware (Communication devices (Modem, Router, Lan card…

- - - - Instruction Register (IR)
      - Program Counter (PC)
      - Memory Address Register
        
        Passing address of obtaining data to main memory via address bus
      - Memory Data Register
        
        Data/Instruction from main memory unit to CPU
        
        Data: Go to ALU
        
        Instructions: Go to IR
      - Status Register (SR)
        
        Indicate the status after execution of instructions
    - - Address Bus
      - Data Bus
      - Control Bus
    - - Dust removal
      - Heat sink (Fan)
    - - Configure computer setting to boost the performance
      - If not kept cool, may damage hardware components
    - - Keep Every Part of CPU Busy
    - - In theory, More core → Quicker R/W speed
- - - - Output
        
        )
        
        Visual Display Unit / Monitor
        
        Dot pitch
        
        Contrast Ratio
        
        Resolution
        
        Display Size
        
        Printer
        
        Dot-Matrix
        
        Thermal
        
        Inkjet
        
        Plotter
        
        Laser
        
        3D
        
        Audio
        
        Speaker
        
        Headphone
      - input device
        
        mechanical mouse
        
        Trackball
        
        Joystick
        
        Trackpoint
        
        optical mouse
        
        Scanner
        
        MircroPhone
        
        Web Cam
        
        Barcode Reader
        
        QR code reader
        
        Keyboard
        
        NumberPad
      - I and O devices
        
        Touch Screen
        
        All-in-one Printer
- - - - ROM ( read- only memory)
        
        BIOS
        
        Bootstrap
        
        Non-Volatile
        
        small memory size
    - - Cache
      - RAM
        
        Volatile:No power → NO MEMORY
        
        with more memory in RAM, better performance
        
        multi-tasking
  - - - E.g. Google Drive,Dropbox...
      - Adv: Can be access anywhere
  - - - Duplicate for an Extra Copy
    - - Set up a Parity Bit in each Drive. If a data is Lost / Damaged , Parity Bit help calculate and retrieve the Data
    - - Split Content into HDD (NOT FAULT TOLERANT)
    - - Combination of Raid 1 and 0