Computer Systems

Computer Systems

1. Data Representation

   • Bit
   • Byte
     • 8 bits
   • Kilobyte
     • 1024 bytes
       • Megabytes
       • Terabytes
       • Gigabytes
   • Binary
     • Written in 1's and 0's
     • 1,2,4,8,16,32,64,128
   • Floating Point Represenantion
     • Very large numbers or accurate numbers
       • Manteisa
         • Expoinent
   • ASCII
     • Stores only words, puncutation and spaces in the document
   • Character Set
     • All keys on the keyboard
     • Range of characters recogainsed by computer system

2. Computer Structure

   • Processor
     • CPU (central processing unit
     • Responsible for computer instructions
   • Control unit
     • Makes Disions
   • ALU
     • Arithmictic logic unit
       • Carries out calculations
   • Registers
     • Tempory memory storage
   • Input
     • output
     • Process
   • Backing Storage
     • Permanent storage
   • Machine code
     • Computer language

3. Types of Computer

   • Palmtop
   • Embbeded
     • A small processor in a large piece
       • Washing machine
   • Mainframe
     • Very large and powerful
   • Clock Speed
     • How fast the computer operates

4. Peripherals

   • Interface
     • Converts speed and volatge between devices
       • Scaner and laptop
   • Features,Funtions and uses of input devices

5. Networking

   • LAN (local area network)
     • Computers in a room/building
   • WAN (wide area network)
     • Large area like a city
   • Clinet
     • workstation organised by a user
   • Server
     • Controls a resoure on the network

6. ACTS

   • Computer missuse act
     • Hacking
   • Copyright and Design patens
     • Copying music/photos/movies
   • Data Protection Act
     • Personal Details

7. Computer Software

   • A computer program that runs when computer is switched on
     • Windows 7
     • Operating system
   • Standard file format
     • different way of storing documents or data that could be differemt on a computer
       • Easy to transfer files
   • RTF
     • Stores words, puncuation,font,size,style
   • Application package
     • Perfoms a given task
   • Intergrated package
     • 2 or more genral purpose packages in 1
       • Microsoft works
   • Virus
     • Attaches its self to files
       • Emails