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Summary Notes for Systems Architecture, Memory and Storage - Paper 1: Computer Systems for Computer Science OCR GCSE (9-1) £8.89   Add to cart
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Summary Notes for Systems Architecture, Memory and Storage - Paper 1: Computer Systems for Computer Science OCR GCSE (9-1)
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Paper 1: Computer Systems for Computer Science OCR GCSE (9-1). Summary Notes for Systems Architecture, Memory and Storage. It covers: - 1.1. Architecture of the CPU - 1.2. CPU Performance - 1.3. Memory - 1.4. Secondary Storage

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  • March 30, 2023
  • 4
  • 2022/2023
  • Summary

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1.1. ARCHITECTURE OF THE CPU

Basic Computer System Models
● Hardware: physical components that makes up a computer
● Software: any applications or programs that runs on a computer

Computer system examples: mobile phones, cash machines, supermarket
tills.

Basic model of computer system:
Input device examples: keyboard,
mouse, scanner, microphone, web
cam.
-> takes real world data and turns
it into a form which can be stored
on a computer.

Output device examples: monitor,
speaker, printer.




● CPU: it processes data and instructions, and controls the rest of the
computer systems.
● Memory (primary storage): holds instructions currently in use/being
executed, and data being used.
○ Located on motherboard
○ So data can be read from and written to very quickly
○ E.g. RAM, graphic card memory, cache memory
● Secondary storage: non-volatile , long-term storage. It is used to keep
programs and data indefinitely. Without secondary storage, all
programs and data would be lost the moment the computer is switched
off.
○ E.g. ROM, hard disk, CD, magnetic tape drives

Von Neumann architecture:

➔ Neumann developed the concept of the stored program computer
➔ Used the ideas of holding bot programs and data in memory

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