OCR J277 GCSE Computer Science Revision Notes

Learn how the CPU works, how performance is measured, and where embedded systems appear in everyday life.

• Architecture of the CPU
• CPU Performance
• Embedded Systems

Understand RAM, ROM, secondary storage, units, binary representation, and compression.

• Primary Storage (Memory)
• Secondary Storage
• Units
• Data Storage (Numbers)
• Data Storage (Characters, Images, Sound)
• Compression

Cover network hardware, topologies, protocols, and the layers you need to know.

• Networks and Topologies
• Wired and Wireless Networks, Protocols and Layers

Revise cyber threats, vulnerabilities, and prevention methods for OCR J277 network security.

• Threats to Computer Systems and Networks
• Identifying and Preventing Vulnerabilities

Learn the purpose of operating systems and utility software in OCR GCSE Computer Science J277.

• Operating Systems
• Utility Software

Explore ethical, legal, cultural, and environmental impacts of digital technology for OCR J277.

• Ethical, Legal, Cultural and Environmental Impact

Step through computational thinking, algorithm design, and search and sort methods.

• Computational Thinking
• Designing, Creating and Refining Algorithms
• Searching and Sorting Algorithms

Cover sequence, selection, iteration, data types, and core programming techniques.

• Programming Fundamentals
• Data Types
• Additional Programming Techniques

Revise defensive design and testing approaches for OCR GCSE Computer Science J277.

• Defensive Design
• Testing

Understand logic gates, truth tables, and Boolean expressions for OCR J277.

• Boolean Logic

Learn about high-level and low-level languages plus the features of integrated development environments.

• Languages
• The Integrated Development Environment (IDE)