Operating Systems

Operating Systems

1. Multitasking

   • Allows several programs to run at the same time
   • The CPU is able to switch its attention to each application in turn, fast enough for the user not to notice that they are not running simultaneously

2. The User Interface

   • Provides a means of communication between the user and the OS
   • Above the kernel so one operating system kernel can provide a range of user interfaces

3. Memory Management

   • Makes sure the programs and data is stored safely and efficiently
   • Makes sure that programs are not able to change the data for another by restricting each programs to its own data

4. Drivers

   • Software used to control a piece of hardware
   • Allow a peripheral device to be connected to a computer

5. Peripheral Management

   • Essential for computer system to input, output and store data.
   • Communicate with all the computer system by controlling signals produced by device drivers
   • Peripheral - Hardware not directly connected to the CPU

6. File Management

   • Locates and saves files in particular places

7. Kernels

   • Deals with low-level hardware operations

8. Firmware

   • Software stored permanently in a device
   • Consists of small programs used to control the device

9. Multi-user and real time system

   • Real time - Critical system that require very short and guaranteed response times
   • Multi-user - Operating system that is able to run many users simultaneously