I/O hardware basics in Operating Systems - Cheat Sheet & Quick Revision

Recall & Review

beginner

What does I/O stand for in computer systems?

I/O stands for Input/Output. It refers to the communication between a computer and the outside world, such as devices that send data to the computer (input) or receive data from it (output).

beginner

Name two common input devices.

Two common input devices are a keyboard and a mouse. They allow users to send data or commands to the computer.

beginner

What is the role of an output device?

An output device receives data from the computer and presents it to the user. Examples include monitors (display screens) and printers.

intermediate

Explain what a device controller does.

A device controller is hardware that manages communication between the computer and an I/O device. It converts data from the device into a form the computer can understand and vice versa.

intermediate

Why is buffering important in I/O operations?

Buffering temporarily stores data during transfer between the computer and an I/O device. It helps handle speed differences and smooths data flow, preventing delays or data loss.

Which of the following is an example of an output device?

A Monitor

B Scanner

C Microphone

D Keyboard

A monitor displays information from the computer, making it an output device.

What does a device controller do?

A Generates power for devices

B Stores data permanently

C Processes user commands

D Manages communication between CPU and I/O devices

A device controller manages the data exchange between the CPU and input/output devices.

Why is buffering used in I/O operations?

A To temporarily store data and handle speed differences

B To increase device size

C To encrypt data

D To reduce power consumption

Buffering helps by temporarily storing data to manage different speeds between devices and the CPU.

Which device is primarily used for input?

A Printer

B Mouse

C Speaker

D Monitor

A mouse is an input device used to send commands or data to the computer.

I/O hardware connects the computer to:

A Internal memory only

B The internet only

C External devices like keyboards and printers

D The CPU only

I/O hardware connects the computer to external devices such as keyboards, printers, and other peripherals.

Describe the difference between input and output devices with examples.

Think about devices that send data to the computer versus those that show or print data.

Explain the role of buffering in I/O hardware and why it is necessary.

Consider what happens when a fast computer talks to a slower device.