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Overview of GCSE Computer Science Paper One

Apr 22, 2025

OCR GCSE Computer Science Paper One Overview

This guide provides a quick recap of key topics for the OCR GCSE Computer Science Paper One, focusing on essential concepts and details within a 30-minute timeframe. For thorough revision, consult additional resources.

CPU (Central Processing Unit)

  • Function: Executes program instructions using data.
  • Components:
    • ALU (Arithmetic Logic Unit): Performs arithmetic and logic operations.
    • Control Unit: Manages the fetch-execute cycle and decodes instructions.
    • Cache: A small, fast type of memory storing frequently used data and instructions.
    • Registers: Ultra-fast, small storage for CPU processes; includes MAR, MDR, Program Counter, and Accumulator.

Fetch-Execute Cycle

  • Stages:
    • Fetch: Retrieve instruction from memory.
    • Decode: Interpret the instruction.
    • Execute: Perform the instruction; may require data fetch.
  • Clock Speed: Determines cycles per second (measured in GHz).
  • Cores: More cores allow parallel processing.

Storage Types

  • Primary Storage:
    • RAM: Volatile memory used for currently running programs.
    • ROM: Non-volatile memory storing boot-up instructions.
  • Secondary Storage:
    • Types: Magnetic (HDDs), Optical (DVDs), Solid State (SSDs).
    • Virtual Memory: Uses secondary storage to extend RAM.

Data Representation

  • Binary Units: Bit, Nibble, Byte, Kilobyte, etc.
  • Binary Arithmetic: Addition, shifts, and overflow errors.
  • Character Sets: ASCII (limited character set) vs. Unicode (extensive).
  • Image Representation: Pixels, resolution, color depth.
  • Sound Representation: Sampling, bit depth, sample rate.

Networks

  • Types: LAN (local), WAN (wider area).
  • Topologies: Star (central node dependent), Mesh (direct device connections).
  • Network Performance Factors: Bandwidth, number of devices, collisions.
  • Internet Concepts: IP addresses, packets, DNS.

Cybersecurity

  • Attacks: SQL injection, brute force, DOS, social engineering.
  • Defenses: Firewalls, anti-malware, user access levels, encryption.

Operating Systems

  • Functions:
    • User Interface: GUI vs. Command Line.
    • Memory Management: Allocating and freeing RAM.
    • Peripheral Management: Driver installations.

Software Categories

  • Utility Software: Includes disk defragmentation tools.
  • Open Source vs Proprietary Software: Open for modification vs. licensed use.

Legal and Ethical Issues

  • Data Protection Act: Protects personal data.
  • Computer Misuse Act: Aims to prevent hacking and malware.
  • Copyright Act: Protects intellectual property.
  • Privacy and Cultural Issues: Data minimization, ethical considerations.

Exam Tips

  • Focus on balanced answers with contextual relevance.
  • Aim for coherent points, not just separate facts.

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