1.7 Operating systems

1.7 Operating systems

1. User Interfaces

   • Menu Driven e.g chip and pin.
     • Used in transaction payment
     • Single option chosen
     • Often buttons on keypad
   • Command Line
     • Text based
     • For people with specific wishes - Advanced
     • Efficient
   • Natural Language e.g. Siri, Cortana
     • Responds to speech
     • Often unreliable
   • GUI (graphical user interface)
     • WIMP (Windows, Icons, Menus, Pointers
     • Visual
     • Interactive
     • Optimised for mouse/pointer

2. Examples of operating systems

   • Android
     • Lollipop
     • Jelly bean
   • IOS
   • Linux
   • Windows
     • 95
     • 10
   • Mac OS X
   • Unix

3. Reasons to update systems

   • Technological Advances
   • Fill in security gaps
   • Troubleshoot
   • Emojis (IOS)

4. Features

   • Multitasking
     • Multiple apps at same time
     • Each process is given a small time slice of processor time
     • Memory in RAM becomes fragmented and overlays space in the RAM if the size of a file is bigger than the allocated space
   • Device drivers
     • Device drivers translate instructions into commands for different types of machines e.g. printers