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Computer Science
OCR GCSE Computer Science
Paper 1

OCR GCSE Computer Science · J277

OCR GCSE Computer Science Paper 1

Computer systems

Length: 1 hour 30 minutes
Marks: 80
Weighting: 50% of the GCSE

From the OCR specification (opens in a new tab), Version 3.1 (May 2026), PDF page 25.

6 sections · 54 revision notes

What’s on Paper 1

1.1 Systems Architecture

CPU Architecture · CPU Performance · Embedded Systems6 notes

1.1.1 CPU Architecture

Purpose of the CPU Free
CPU Components and Functions Pro

Paper 1 past papers

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Paper 2

Von Neumann Architecture Pro

1.1.2 CPU Performance

CPU Characteristics and Performance Pro

1.1.3 Embedded Systems

Characteristics of Embedded Systems Pro
Examples of Embedded Systems Pro

Systems Architecture overview

1.2 Memory and Storage

Primary Storage · Secondary Storage · Data Units · Data Storage · Compression28 notes

1.2.1 Primary Storage

Need for Primary Storage Free
Differences Between RAM and ROM Pro
Purpose of ROM Pro
Purpose of RAM Pro
Virtual Memory Pro
Cache Memory Pro

1.2.2 Secondary Storage

Need for Secondary Storage Pro
Types of Secondary Storage Pro
Selecting Suitable Storage Pro

1.2.3 Data Units

Units of Data Storage Pro
Binary Data Conversion Pro
Calculating Data Capacity Pro

1.2.4 Data Storage

Denary and Binary Conversion Pro
Binary Addition and Overflow Pro
Denary and Hexadecimal Conversion Pro

1.2.5 Compression

Need for Compression Pro
Types of Compression Pro

Memory and Storage overview

1.3 Computer Networks and Protocols

Networks and Topologies · Networks, Protocols and Layers12 notes

1.3.1 Networks and Topologies

Types of Network Free
Network Performance Factors Pro
Client-Server and Peer-to-Peer Pro
LAN Hardware Pro
The Internet and Cloud Pro
Star and Mesh Topologies Pro

1.3.2 Networks, Protocols and Layers

Modes of Connection Pro
Encryption Pro
IP and MAC Addressing Pro

Computer Networks and Protocols overview

1.4 Network Security

Threats to Computer Systems and Networks · Identifying and Preventing Vulnerabilities2 notes

1.4.1 Threats to Computer Systems and Networks

Forms of Attack Free

1.4.2 Identifying and Preventing Vulnerabilities

Common Prevention Methods Pro

Network Security overview

1.5 Systems Software

Operating Systems · Utility Software3 notes

1.5.1 Operating Systems

Purpose and Functionality of Operating Systems Free

1.5.2 Utility Software

Purpose and Functionality of Utility Software Pro
Utility System Software Pro

Systems Software overview

1.6 Impacts of Digital Technology

Ethical, Legal, Cultural, and Environmental Impacts3 notes

1.6.1 Ethical, Legal, Cultural, and Environmental Impacts

Impacts of Digital Technology on Wider Society Free
Computer Science Legislation 2 notes
- Computer Science Legislation Pro
- Software Licences: Open Source and Proprietary Pro

Impacts of Digital Technology overview

Comparing Storage Devices Pro

Binary and Hexadecimal Conversion Pro

Binary Shifts Pro

Binary Character Representation Pro

Character Sets Pro

Bits per Character and Capacity Pro

Binary Image Representation Pro

Image Metadata Pro

Colour Depth and Resolution Pro

Digital Sound Sampling Pro

Sound Quality and File Size Pro

Network Standards Pro

Common Network Protocols Pro

Network Layers Pro