Key term
WJEC A-Level Computer Science 601-5345-3
Hardware: Architecture, Memory and Storage
Networks and Data Transmission
Logic Gates and Boolean Algebra
Data Representation and Data Types
Data Structures
Organisation of Data: Files and Records
Database Systems
The Operating System
Algorithms and Programs
Principles of Programming
Systems Analysis
Software Engineering and Program Construction
Topic overviewIntegrated development environments and their purposeEditors, syntax highlighting and code entry toolsDebugging tools: breakpoints, stepping and watchesTranslation, source code and object codeLexical analysis and the symbol tableSyntax and semantic analysisCode generation and optimisation
Types of Software System
Practical Programming
Data Security and Integrity
Computing, Society and the Law
Topic overviewSocial and economic change from computingComputers and the nature of employmentThe digital divide and cultural changeEnvironmental cost of computingData protection and freedom of information lawThe Computer Misuse Act 1990 and computer crimeCopyright, surveillance and professional codes
Advanced Data Structures and Logic
Recursion, Sorting and Searching
Programming Paradigms and Translators
Topic overviewFunctional, declarative and imperative paradigmsClasses, methods and object-oriented designStandardisation of computer languagesAmbiguity in natural language and unambiguous notationBackus-Naur form and syntax diagramsCompilers, interpreters and assemblersTranslation and execution errors
System Design and Human-Computer Interaction
Software Engineering Tools and Professional Practice
Topic overviewSoftware tools for the software engineering processSoftware packages in systems analysis and specificationSoftware packages in systems designTesting tools and testing strategiesProgram version managementProgram libraries and project management toolsCodes of conduct and professional behaviour
Advanced Architecture and Assembly Language
Communication Networks and File Organisation
Number Representation and Floating Point
Databases and Distributed Systems
Topic overviewConsistency, redundancy and data independenceRelational organisation and normalisationRestructuring data into third normal formEntity relationship modellingQuery languages and SQLValidation, verification and the DBMSBig Data, data warehousing and miningDistributed systems and distributed databases
Operating System Management
Software Systems and Applications
Data Security, Cryptography and Attack
Hardware: Architecture, Memory and Storage
Components of a computer system and how they connect
- 3 things to know
- AS Unit 1
Overview
Four broad functions that any computer system performs on data, three buses that connect the processor to main memory and three signals that travel along the control bus.
What you need to know
Answer each one before you reveal it.
Your recallNot started
Process
Name the three buses that connect the processor to main memory.
Key term
Why is the address bus unidirectional while the data bus is bidirectional?
Questions from this subtopic
Each one with the model answer underneath.
- 1
What are the four broad functions that any computer system performs on data?
Model answer
Input, processing, storage and output.
- 2
Name the three buses that connect the processor to main memory.
Model answer
The address bus, the data bus and the control bus.
- 3
Why is the address bus unidirectional while the data bus is bidirectional?
Model answer
Addresses are only ever sent out by the processor to select a location, whereas data must travel both from memory into the processor on a read and out to memory on a write.
- 4
A machine has a 32-bit address bus. How many separate memory locations can it select, and how is that figure reached?
Model answer
It can select 2³² = 4,294,967,296 locations, because each of the 32 lines independently carries a 0 or a 1.
- 5
What determines how many bits can be moved between processor and memory in a single transfer?
Model answer
The width of the data bus, that is the number of parallel lines it carries.
- 6
Name three signals that travel along the control bus.
Model answer
A read or write signal, the clock pulse, and an interrupt request.
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