Questions and Answers
What is the primary function of the operating system running in kernel mode?
To execute all machine instructions and have complete access to hardware
What is the main purpose of dividing software into kernel mode and user mode?
To provide a security boundary and restrict access to machine resources
Which of the following instructions is forbidden to user-mode programs?
I/O instructions
What is the term used to describe the operating system's mode of operation when it has complete access to all hardware?
Signup and view all the answers
What type of hardware is responsible for storing data persistently?
Signup and view all the answers
What is the primary difference between kernel mode and user mode?
Signup and view all the answers
What is the primary reason for having an operating system in a computer?
Signup and view all the answers
What is the true operating system running on Android smartphones and tablets?
Signup and view all the answers
What is the most popular operating system in the world and its variants?
Signup and view all the answers
What is the primary function of the shell in a text-based operating system?
Signup and view all the answers
What is the main reason why operating systems are necessary for computers?
Signup and view all the answers
What is the relationship between macOS and iOS?
Signup and view all the answers
What is the primary function of the operating system in managing the computer's resources?
Signup and view all the answers
What is the primary difference between a computer and a smartphone or tablet?
Signup and view all the answers
Study Notes
Computer System Components
- A modern computer consists of processors, main memory, hard disks or Flash drives, printers, keyboard, mouse, display, network interfaces, and other input/output devices.
Operating System Functions
- The operating system provides a simpler model of the computer for user programs.
- It handles managing all hardware resources, including processors, memory, hard disks, printers, keyboard, mouse, display, and network interfaces.
Operating Systems in Smartphones and Tablets
- Smartphones and tablets are just computers in a smaller package with a touch screen.
- They all have operating systems, such as Apple's iOS and Android, which runs on top of Linux.
Relation to UNIX
- macOS (and thus iOS) is derived from Berkeley UNIX.
- Linux is a clone of UNIX.
- Therefore, UNIX and its variants are the most popular operating system in the world.
User Interface
- The program users interact with (shell or GUI) is not part of the operating system.
- It uses the operating system to get its work done.
Hardware and Software Layers
- Hardware consists of physical objects such as chips, boards, Flash drives, disks, keyboard, and monitor.
- Software runs on top of the hardware, including the operating system and user programs.
Kernel Mode and User Mode
- The operating system runs in kernel mode (supervisor mode) for at least some of its functionality.
- In kernel mode, the operating system has complete access to all hardware and can execute any machine instruction.
- User programs run in user mode, with limited access to machine instructions, excluding control, security, and I/O operations.
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
Description
This quiz covers the various components that make up a modern computer system, including processors, memory, storage, input/output devices, and network interfaces. It explores how these components work together and how they are managed.
