In addition to the processor and a set of memory modules, the third key element of a computer system is a set of I/O modules. Each module interfaces to the system bus or central switch and controls one or more peripheral devices. An I/O module is not simply a set of mechanical connectors that wire a device into the system bus. Rather, the I/O module contains logic for performing a communication function between the peripheral and the bus.

a. True
b. False

An output device can be defined as a hardware device that typically receives processed data from the central processing unit (CPU) and converts these data into information that can be used by the end user of a computer system.

Also, an input device can be defined as any device that is typically used for sending data to a computer system.

Generally, all of the output and input device of a computer are known as peripheral (external) devices and they provide data (informations) to the end users in various formats such as video, audio, texts, images etc.

Since output and input devices are peripheral (external) devices, they can be connected to the computer system wirelessly or through a wired-connection (cable).

Some examples of peripheral (external) devices are monitor, speakers, keyboard, printer, mouse, scanner, projector etc.

Basically, the three (3) key element of a computer system are: a set of memory modules, processor and a set of input-output (I/O) modules. Each of the input-output (I/O) module interfaces to the central switch or system bus and are used to control one or more peripheral (external) devices.

Hence, an input-output (I/O) module is not simply a set of mechanical connectors that wire a device such as mouse, monitor or keyboard etc, into the system bus. Rather, the input-output (I/O) module comprises of logic (digital binary codes) for technically performing a communication function between the peripheral and the bus.