Input / Output organization

Peripheral device:

            All the device that are connected to the computer for the various purposes such as to send input, store data and get output are known as peripheral device. Keyboard, mouse, printer, scanner are the peripheral devices.

Types of peripheral device:   

            There are many different peripheral devices but they fall into three general categories:

1.       Input device (Such as Mouse, Keyboard etc.)

2.       Output device (Such as Monitor, printer etc.)

3.       Storage device (Such as Hard disk, flash drive etc.)

Some devices fall into more than one category such as CD-ROM drive it can be used to read data or music (input) and to write data to CD (output).

Peripheral device can be external or internal. For example a printer is an external device that you connect using a cable while and optical disk drive is typically located inside the computer case. Internal peripheral device are also referred to as integrated peripherals.

Basic I/O Interface:

I/O interface provides a method for transferring information between internal storage and external input/output device (peripheral device). Peripheral connected to a computer need special communication link for interfacing them with CPU unit.