A Level Computing | OCR Unit One Complete Revision

Complete revision guide for OCR A Level Unit One F451 topic. With highlighted keywords and easy to follow formatting.

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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 is the virtual application system which the user
typically interacts with. Software includes the operating system
and application software.
Peripheral = Peripheral is an external device of the computer which is used
to interact with the computer system. Peripherals include
Keyboards, Mice, Printers, etc.
Input = Input devices are computer peripherals which send signals to
the computer system. These signals allow the user to interact
with the computer system. Input devices include Keyboards and
Output = Output devices are computer peripherals which receive signals
from the computer system and carry out a selected task. Output
devices include Printers.
Storage devices are used in a computer system to allow the computer to store
data and information. Conventionally the Hard Drive is the primary storage
device for a computer system. However other storage devices are available,
such as:
Solid State Disks Flash Drives
CD Discs RAM
DVD Discs Memory Cards
Systems software is the primary software used on a computer such as Operating
Systems and BIOS.
Application software is the applications which are ran on the computer system.
Such as productivity software, media software, internet browsers, etc.
OCR Computing Revision Unit One (F451) | Computing Revision
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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 is
completed and the next task begins.
The Spiral model is the more detailed model of the systems development life
cycle.…read more

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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 to carry out multiple
tasks however more specific software can be obtained
off the shelf.…read more

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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
o Menu Based Interfaces or MBI's is a simple menu form which a
user chooses an option.…read more

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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
computer.…read more

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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.…read more



These are brilliant, thanks!

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