I/O Subsystem : Introduction

The I/O subsystem of a computer provides an efficient mode of communication between the central system and the outside environment. It handles all the input-output operations of the computer system. The primary concerns of I/O subsystem includes the coordination of central processor and I/O subsystem activities, the mapping of external I/O processing requirements into the basic functionality of the I/O subsystem, and the management of concurrent processing activities within the I/O subsystem itself.

Peripheral Devices :

The devices which are connected to a computer and runs under the control of microprocessor are called peripheral devices. These devices are designed to read information into or out of the memory unit upon command from the CPU and are considered to be the part of computer system. Peripheral devices can be mainly classified into input devices and output devices.

1. Input Devices : Data and instructions are entered into a computer through input devices. For example keyboard, mouse, joystick, touch screen etc.

2. output Devices : Output devices are used to send the information stored in the memory or the result of any operation performed by the CPU. There are many output devices available for this purpose, but the most commonly used output devices are the video monitors and printers. Printers gives us output as a permanent record on paper.

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