QUESTION 4:
Which of the following are NOT I/O devices?
- the keyboard.
- a CD-ROM reader
- the CPU
- the power supply
- the printer cable.
- a floppy disk drive.
The hard disk of a computer system is used for both input to a program and output from a program. Other devices are exclusively input devices (such as the keyboard or mouse) or output devices (such as the printer and monitor.)
Input and Output are so important to a computer system that the abbreviation I/O is used. Any device which does either input, output, or both is called an I/O device. The movement of data from or to such a device is often called "I/O".
Which of the following are NOT I/O devices?