Operating systems

Operating systems

1. Managing Resources

   • Peripherals
     • Peripherals
       • Driver
         • Software used to map commands to individual peripherals
       • Input and Output Devices
         • Mouse
         • Keyboard
       • The programmer doesn't need to know what specific device is being used
   • Printing
   • Backing Store
   • File Compression
   • Security
   • Memory
   • Disk fragmentation

2. Resources

   • System
     • Security
       • Firewall
     • Processes (multi-tasking)
       • e.g. Google open with something else
     • Memory (RAM)
     • Disk de-fragmentation
     • File compression
       • Same contents , compressed into smaller size
     • Backing stores
       • (Back-ups) Store important files
       • OS' manage this for user
       • OS makes regular backups of the format
     • Printing
       • If program needs to print document, tell the system to print it
       • OS' will then spool the print job (it will keep in queue until printer is ready)
       • Means program does not need to woeey about the printer being bus
     • Peripherals (input and output devices)
       • Things that attach to computer
       • Operating systems require a driver software for each device
       • A device driver maps the OS' command for the device