Functional components of a computer system

Computer systems ranging from a controller in a microwave oven to a large supercomputer contain components providing five functions. A typical personal computer has hard, floppy and CD-ROM disks for storage, memory and CPU chips inside the system unit, a keyboard and mouse for input, and a display, printer and speakers for output. The arrows represent the direction information flows between the functional units.

Computer Parts & Accessories

Computer parts and accessories are physical components, which can be mechanical, magnetic, electronic or electrical. These components can generally accept and store computer data, execute the operations on a computer in a proper sequence and produce control outputs. The computer parts and accessories are capable of performing many logical functions like interpretation of data, communication, computation etc.

Computer Peripherals

A peripheral is a piece of computer hardware that is added to a host computer, i.e any hardware except the computer, in order to expand its abilities. More specifically, the term is used to describe those devices that are optional in nature, as opposed to hardware that is either demanded or always required in principle.

The term also tends to be applied to devices that are hooked up externally, typically through some form of computer bus like USB. Typical examples include joysticks, printers and scanners. Devices such as monitors and disk drives are not considered computer peripherals when they are not truly optional.

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