Page 186 - DCAP403_Operating System

Unit 9: I/O & Secondary Storage Structure

9.11 Keywords Notes

Digital camera: A type of camera that stores the pictures or video it takes in electronic format
instead of to fi lm.
I/O devices: Hardware, which are used by a person (or other system) to communicate with a
computer.
Input: It is the signal or data received by the system.
Joystick: A computer joystick allows an individual to easily navigate an object in a game such as
navigating a plane in a fl ight simulator.
Keyboard: One of the main input devices used on a computer, a PC’s keyboard looks very similar
to the keyboards of electric typewriters, with some additional keys.
Microphone: A microphone is a hardware peripheral that allows computer users to input audio
into their computers.
Monitor: Also called a video display terminal (VDT) a monitor is a video display screen and the
hard shell that holds it.

Mouse: An input device that allows an individual to control a mouse pointer in a graphical user
interface (GUI).
Output: It is the signal or data sent from the system.

Printer: An external hardware device responsible for taking computer data and generating a
hard copy of that data.
Scanner: Hardware input device that allows a user to take an image and/or text and convert it

into a digital file, allowing the computer to read and/or display the scanned object.
Web Cam: A camera connected to a computer or server that allows anyone connected to the
internet to view still pictures or motion video of a user.
9.12 Self Assessment

Fill in the blanks:
1. In computer architecture, the combination of the ....................... and ....................... is
considered the heart of a computer.
2. I/O devices can be installed into ....................... of the computer.
3. A hardware device that sends information into the CPU is known as ....................... device.

4. Any peripheral ....................... from a computer is known as output device.
5. A driver acts like a translator between the ....................... and ....................... .
6. A ....................... is the smallest physical storage unit on the disk.
7. The size of a sector is ....................... .
8. Most disks used in personal computers today rotate at a ....................... .
9. The operating system works as ....................... between the machine and the user.
10. ....................... are often used to control video games, and usually have one or more
push-buttons whose state can also be read by the computer.
11. The I/O and memory interface are the ....................... to the bus control logic.
12. An ....................... is bridge between the processor and I/O devices.

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