Topic 1.1
1.1 Systems Architecture
CPU components, Von Neumann architecture, and the fetch–decode–execute cycle for GCSE OCR J277.
GCSE Computer Science Videos
Watch the full GCSE course in order — from 1.1 Systems Architecture to 2.5 Languages & IDEs. Each topic includes an embedded video, a short summary, and quick links to Flashcards, Quizzes, Practice Questions, and Slides.
Topic 1.2
1.2 Memory and Storage
RAM vs ROM, secondary storage types, capacity, speed and suitability.
Topic 1.3
1.3 Computer Networks
LAN/WAN, topologies, hardware, and network performance factors.
Topic 1.4
1.4 Network Security
Threats, vulnerabilities, and techniques to secure computer systems and data.
Topic 1.5
1.5 Systems Software
Operating systems, utility software, and their roles in managing hardware and files.
Topic 1.6
1.6 Ethical, Legal, Cultural, and Environmental Impacts
Societal impacts of computing, key UK laws, and ethical considerations.
Topic 2.1
2.1 Algorithms
Algorithmic thinking, decomposition, abstraction, flowcharts, and pseudocode.
Topic 2.1.3
2.1.3 Searching and Sorting Algorithms
Linear vs binary search; bubble, insertion, and merge sort explained for exams.
Topic 2.2
2.2 Programming Fundamentals
Variables, data types, selection, iteration, and subroutines in Python.
Topic 2.3.1
2.3.1 Defensive Design (Producing Robust Programs)
Validation, verification, authentication, and input sanitisation.
Topic 2.3.2a
2.3.2a Testing
Types of testing, test tables, and iterative development for reliability.
Topic 2.4.1
2.4.1 Boolean Logic
Logic gates, truth tables, and simplifying logic circuits.
Topic 2.5.1
2.5.1 Languages and IDEs
High vs low level languages, translators, and IDE tools for productivity.
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