CAIE IGCSE ICT Summary Notes

Computer Systems

  • Hardware: Physical components comprising a computer system.
  • Internal Devices: CPU, motherboard, RAM, ROM, graphics & sound cards, internal storage (HDD, SSD), NIC.
  • External Devices: Monitor, keyboard, mouse, printer, external storage.
  • Software: Instructions and programs controlling the operation of hardware.
  • Application Software: Specific tasks (e.g., spreadsheets).
  • System Software: Platform for applications (e.g., OS, device drivers).

Types of Data

  • Analogue vs. Digital Data: Analogue is continuous; digital is binary (0,1).
  • ADC/DAC: Hardware converts analogue to digital (ADC) and back (DAC).

CPU and Memory

  • CPU: Executes operations; consists of CU, ALU, and registers.
  • Memory:
  • RAM: Volatile, temporary storage; data lost on power off.
  • ROM: Non-volatile; stores configuration data (e.g., BIOS).

Input & Output Devices

  • Input Devices: Allow data entry (e.g., keyboard, mouse).
  • Output Devices: Display processed results (e.g., monitor, printer).

Operating Systems

  • Manage all operations, software and hardware, user input, and device communication.
  • Examples: Windows, macOS, Linux.

Types of Computers

  • Desktop Computers: General-purpose, stationary, upgradeable.
  • Laptops: Portable, all-in-one design; battery-operated, less upgradeable.
  • Smartphones: Compact, multifunctional; access to apps and internet.
  • Tablets: Larger than smartphones, touch interface, portable.
  • Phablets: Hybrid between tablets and smartphones.

Emerging Technologies

  • AI: Machines performing tasks requiring human-like intelligence.
  • Extended Reality: Combines real and virtual environments (AR & VR).

Networking

  • Routers, Hubs, Switches: Devices connecting networks, managing data traffic.
  • LAN/WAN: Local Area Networks (within buildings) vs Wide Area Networks (geographically dispersed).
  • Wi-Fi/Bluetooth: Wireless communication technologies for local area connections.

Cloud Computing

  • Types: Public, Private, Hybrid cloud solutions for data storage and management.
  • Benefits: Scalability, remote access, cost-effective.

Data Protection & Security

  • Data Protection Act: Regulations governing the collection and storage of personal data.
  • E-safety Measures: Awareness of online risks, protecting personal information.
  • Security Measures: Firewalls, encryption, and authentication methods like biometric scans.

Health Issues

  • Prolonged IT Usage: Risks include RSI, back strain, eye strain.
  • Preventative Measures: Ergonomic equipment, regular breaks, proper lighting.

Effective Communication

  • Using Email: Guidelines like netiquette, use of CC/BCC, and handling spam.
  • Internet Use: Advantages and disadvantages, including access to vast information vs misinformation.

Copyright and Intellectual Property

  • Necessary to protect creators' rights and prevent software piracy.
  • Importance: Encourages innovation, protects users from fraud.