Operating Systems

Operating Systems

1. User Interface

   • Provides interface through which user can input data
   • Allows the computer to output data to the user, graphically

2. Error Reporting

   • Reports errors back to OS creator

3. Memory Management

   • Dynamically allocates memory to programs at their request
   • Frees memory for reuse when it is no longer needed

4. Resources Management

   • Memory Management
   • CPU Management

5. I/O Management

   • Manages I/O

6. Device Management

   • Allows a user to view and change all devices and their properties

7. Interrupt Management

8. Types of OS

   • Single user OS
     • Dos/Windows/Linux
     • One user access one computer at a time
   • Multi- tasking OS
     • Allows multiple applications to run at once
     • Most single user systems offer this too
   • Multi- user OS
     • Several users share data and resources
     • A network
     • The server needs a NOS (Network OS)
       • Gives the server tools to control communication on network and other things
       • UNIX
   • Dumb client system
     • Server connected to many dumb terminals
     • Terminals do not have their own processing ability or storage capacity