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Computer Science

GCSE · OCR

QuestionsFlashcards

Identifying & Preventing Threats to Computer Systems & Networks
- Forms of Attack on a Network
  8
- Methods of Preventing a Network Attack
  10

Operating Systems & Utility Software
- The Purpose & Functionality of Operating Systems
  7
- The Purpose & Functionality of Utility Software
  6

Ethical, Legal, Cultural & Environmental Impact
- Impacts of Digital Technology on Wider Society
  7
- Legislation in Computer Science
  8

Boolean Logic Diagrams
- Boolean Logic Diagrams
  9
- Combining Boolean Operators
  7

CPU Components & Their Function Flashcards

All 6 cards in this deck

What is the function of the Arithmetic Logic Unit (ALU)?: It performs all arithmetic and logical operations on data, e.g. addition, subtraction and comparisons.
What is the function of the Control Unit (CU)?: It controls the fetching, decoding and executing of instructions, and sends control signals to manage hardware and move data around the system.
What is cache in the CPU, and what is it used for?: High-speed memory built into the processor that temporarily holds data and instructions the processor is likely to reuse, so they can be fetched quickly.
What are registers?: Small amounts of extremely fast temporary memory inside the CPU that hold the data and addresses needed during processing.
Which CPU register holds the instruction that is currently being decoded and executed?: The Current Instruction Register (CIR).
What is a bus in a computer system?: A channel of communication that transports data, addresses and instructions between components. e.g. the address bus carries the address from the MAR to memory.