OS Overview

Operating System

• a program that abstracts hardware resources for other programs to use

Hardware Resources

• CPU
  • processor, executes instructions
  
• Memory
• volatile memory, can be read from and written to in bytes when the computer is powered on

• Input/Output
• Storage (persistent) devices
• Hard Drive (spinning disks)

• Solid State Drive (SSD)

• USB drives
• Network Adapter (NIC)
• connects computer to a network

• Input devices: mouse, keyboard, webcam, microphone
• Output devices: monitor, headphones, speakers

Software Abstractions

• How does OS abstract these hardware resources?
• CPU => ?
• Memory => ?
• Storage => ?
• Network adapter => ?
• Keyboard => ?
• Is it always one hardware resource to one service?
• What do we gain from these abstractions?
• How does the OS provide these abstractions?