operating system

operating system

1. peripherals

   • external hardware devices
   • drivers used to map OS code to hardware code
     • OS needs a driver to work with newer hardware

2. CPU

   • manages processor by allocating time to running processess
   • multitasking
     • splits processor time between different programs making them appear to run simultaneously

3. backing store

   • stores backups of important data
   • cloud
   • local

4. CLI

   • A CLI is a text-based interface.
   • Nearly every operating system provides a CLI.
   • These are harder to use, but are very lightweight and robust – they use few system resources and are very unlikely to crash or break
   • Advantages of CLI
     • Few system resources required
     • Easy to automate (commands can be stored in file)
   • Disadvantages of CLI
     • Hard to learn
     • Difficult to compare outputs of different programs

5. interrupts

   • software
     • triggered by programs
   • hardware
     • triggered by kbm etc
   • pauses currently running processes

6. memory (ram)

   • splits memory into pages to prevent programs from reaching eachothers data