Introduction of Computer Hardware

A processor is a device that executes instructions on calculatinginformation. The processor draws information and processing instructions in memory - devices for storing information.Treatment outcomes are also placed in memory.
Input devices allow a human to control the computing device and to enter information.
Output devices are used to extract information from thecomputing device, and in a form usable by a human.
Telecommunication devices allow the exchange of informationbetween different computing devices. see computer network. The interior of the casing of a computing device contains one or more printed circuit on which are soldered electronic componentsand connectors. The motherboard is the central printed circuit on which are connected all the other equipment. The devices are by definition equipment located outside the housing.

The computer bus [edit]
Main article: computer bus.
A computer bus is a set of communication lines that serve the exchange of information between components of a computing device. The information is transmitted as sequences of electrical signals.
In a serial bus, the information is transmitted one bit after anotheron a single bus line, or two (one in each direction)
In a parallel bus, the information is transmitted in groups of bitsover multiple lines simultaneously.
The "width" of a parallel bus is the number of bits of a group and therefore the number of lines used for transmission.
Some computer bus standards:
SCSI (English acronym for Small Computer System Interface) is an industry standard parallel bus, released in 1986, used to connect disk drives, scanners, and various mass storage.