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OS and system software (interrupts (types (software (illegal instruction…

- - - - using device drivers
      - translate OS instructions into those understood by specific models
    - - allocating and managing memory
      - using paging and segmentation
      - managing virtual memory
    - - which process to execute next
      - handling interrupts
    - - framework for application to run
      - allowing them to open and close files easily
      - user can interact with OS to manage files and use range of utilities
    - - communication through protocols to other machines and devices
    - - servicing and denying requests to access the resources connecting to the coputer
    - - user interacts with applications through
        
        graphical user interface
        
        windows icons menus pointers
        
        command line
- - - - fixed size memory locations
      - physical devisions
      - made to fit sections of memory
    - - allows programs to run with insufficient memory
    - - doesn't take into account what each page is doing
- - - - power/reset button is pressed
      - memory parity error(corrupt memory)
    - - illegal instruction encountered
      - arithmetic
      - new log-on request
    - - buffer nearly empty
      - signal the completion of a data transfer to/from a device
- - - - this is when a physical server brakes and the other servers on the network can take up the slack so that the servers can carry on as if it never broke
  - - - code would need to be written for each platform
      - or a suitable compiler would need to be used