Operating System

• Hardware Abstraction

  Bridge between user and hardware

  • hides complexity
  • human usable
• Memory Management

  • Loading and Unloading of RAM
  • Efficient allocation of RAM space
  • virtual memory creation/usage
  • separation of different data for security
• Peripheral management

  • Usage of device drivers (communicate with I/O controllers)
  • coverts peripheral signals into OS signals as an interface
  • allocation of tasks
• Process Scheduling

  Management of tasks by allocating processing time

  • multitasking
  • scheduler used to efficiently allocate processor time & queue-up
• A real-time operating system (RTOS) is an operating system (OS) for real-time computing applications that processes data and events that have critically defined time constraints
• A network operating system (NOS) is a specialized operating system for a network device such as a router, switch or firewall.
• A distributed operating system is a collection of independent software, networked, communicating, and physically separate computational devices. They handle jobs which are serviced by multiple CPUs.