slide1
Download
Skip this Video
Download Presentation
Computer Systems

Loading in 2 Seconds...

play fullscreen
1 / 27

Computer Systems - PowerPoint PPT Presentation


  • 172 Views
  • Uploaded on

Computer Systems can be viewed as a set of five cooperating subsystems: ... Tells the computer how to perform operations like input, output and storage ...

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'Computer Systems' - Kelvin_Ajay


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
computer systems
Computer Systems
  • A computer system is a combination of hardware and software , functioning together, processing data to achieve a purpose.
  • Computer Systems can be viewed as a set of five cooperating subsystems:
  • INPUTOUTPUTSTORAGEPROCESSCONTROL
computer systems3
Computer Systems
  • A computer is an electronic device that accepts inputs, processes them and produces an output.
  • In processing, the computer follows out instructions
  • To carry out the instructions the following are needed:
    • Hardware
    • Software
    • Data
    • People
    • Procedures
slide4
STORAGE

OUTPUT

INPUT

PROCESS

CONTROL

slide5
Hardware

Software

Computer

Systems

Control

Storage

software
SOFTWARE
  • Software is a set of instructions that direct the hardware to perform certain tasks.
  • There are 3 types of software :
  • Systems Software
  • Utility Software
  • Applications Software
systems operating software
Systems/Operating Software
  • Tells the computer how to perform operations like input, output and storage
  • Operating system-collection of programs used to organise files, communicate with peripheral devices and assist in the operation of the computer
  • The link between hardware and application software ( eg DOS, WINDOWS (95/98, XP)
utility software
Utility Software
  • Specialised programs that perform 1 or a few basic tasks
  • Examples are virus checkers, spell checkers, clock , calculator,editors etc
applications software
Applications Software
  • Designed to carry out a particular task, or to solve a user’s problem
  • allows computer to perform a wide range of tasks
  • Examples: Word processing packages
  • Spreadsheet packages ( E.g Excel)
  • Games
slide10
INPUT –involves entering data into the computer.
  • This is a signal sent to the computer usually from the keyboard or mouse
slide11
OUTPUT-involves the display of information to a person, data or another computer.
  • A signal sent from the computer to an attached device.
slide13
PROCESS- carrying out a set of instructions, which occurs in the CPU. Changes data to produce information
slide14
CONTROL –co ordinates the operations of the above.
  • Control is part of the CPU. It directs flow.
hardware
Hardware
  • This is the machinery that makes up a computer system – the parts you can touch.
  • Hardware is classified into Peripheral Devices and Central Processor Devices
peripheral devices
Peripheral Devices
  • Peripherals are anything that you attach to a computer
  • These are associated with input, output and storage.
input output devices
Input/Output Devices
  • Interface between a system and its environment
  • They are classified according to speed, flexibility, convenience and cost
input devices
Keyboard

most common - QWERTY keyboard

Mouse

Scanner

digitising - views a page and produces an image

flatbed and hand held

Other Devices

digital camera

video camera

graphics tablet

light pen

barcode reader

temperature sensor

voice recognition equipment

joystick

INPUT DEVICES
output devices
Printers

Inkjet/Bubble jet

Laser

Monitor

also called VDU - visual display unit

display broken into a grid of pixels

Laptops have a flat panel - LCD - liquid crystal display

Other output devices

speakers

plotter

sound card

OUTPUT DEVICES
the central processing unit cpu
The Central Processing Unit (CPU)
  • All processing takes place here
  • CPU is made up of millions of electrical circuits put into a silicon chip or integrated circuit
  • CPU is situated on the motherboard
  • CPU is measured in Megahertz(Mhz)
structure of cpu
Structure of CPU
  • CPU is made of 3 parts
  • Arithmetic Logic Unit (ALU) – performs arithmetic (=,-,x./) or logical operations on data. “Logical” includes comparing 2 items.
  • Registers –temporary storage locations for data currently being processed by the CPU
  • Control Unit – directs the flow of data and program instructions within the computer system. It controls movements of data between input, output, ALU and storage
slide22
Buses – data travels throughout the motherboard on bus lines
  • Bus lines are soldered wire and appear silver.
people
People
  • People who work in the computer industry can be categorised as follows:
  • Design and Construction
  • Operations and Management
  • Users
design and construction
Design and Construction
  • These people plan and develop new computer systems or modify old systems.They include:
    • Systems analyst
    • Programmers
    • Engineers
operations and maintenance
Operations and Maintenance
  • They keep the system working efficiently so that it achieves its purpose. They include:
    • Managers
    • Computer Operators
    • Data entry
    • Consultants
    • Technical support
    • Computer technicians
users
Users
  • Users are people who are affected by computer systems. They include:
    • Direct Users
    • Indirect Users
    • Intermediary Users
ad