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AS Computing Revision ­ Unit One OCR

Chapter One: Components of a Computer System
Hardware such as Input and Output hardware or I/O Hardware is used in
computing and computer peripherals.

Hardware = Hardware is the physical components of a computer system
such as the Hard Drive.

Software = Software…

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Chapter Two: Systems Development Life Cycle
The systems development life cycle can be divided into type variations. These
The Waterfall Model
The Spiral Model

The Water Fall model can be considered the conventional model. It shows the
development of a system in a generic downwards time frame. One task…

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Chapter Two: Generic Application Software

Generic Software = Generic Software is a piece of software which has a
relatively large number of different uses.

Off the shelf = Off the shelf software is standard generalised software
which can be purchased in computer and retail stores.
Generally the software is designed…

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Along with these types of computer operating system there are also types of
operating system which have different features, these include:

Graphical User Interfaces
o Graphical User Interfaces or GUI's are user interfaces which allow
for interaction with a computer system and its software through
graphical objects.
Menu Based Interfaces…

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Chapter Four: Processor Components

CPU = CPU is the abbreviation for Central Processing Unit. The
CPU carries out all tasks on the computer system.

Instruction Cycle = Instruction Cycle is the basic operation cycle of a

The components used in a Central Processing Unit include:
Program Counter (PC) an…

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Buffers allow for data to be slowly sent to a device at the devices speed, while
allowing for the CPU to continue operating at its generic speed.

Interrupts are messages from devices to the CPU which request another
instruction. These messages are also given a priority.

OCR Computing Revision Unit…


George Styles


It says at the bottom that this is page 1 of 6 but I can't see any other pages, is this a problem on my end or are the other 5 pages not uploaded with this document? :)



Nice document. Covers the basics and touches on the more advanced aspects of the course. Thanks for this!

(Note: Document still relevant to the 2016-17 course, regardless of it being 5 years old.)

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