Modular concept of a computer (PC)

Computers (PC) are characterized mainly by their modular concept i.e.: a mother chart, expander cards, a power supply unit, readers, a sorter and an external monitor, the majority of the computers are composed of interchangeable elements which can be added or withdrawn very easily, allowing to the users carried out many operations of repair and update.

The expander cards or adaptors, are charts with integrated circuits designed with a special aim, they plug in on the mother chart, in catches called slot of extensions. The nature of the slots on mother chart characterizes the capacity and the power of your computer.

The mother chart, the largest chart with integrated circuits, sometimes called principal chart, contains the CPU or processor (central processor links) which constitutes the brain of the computer, carrying out the essence of handling of data and instructions.

There is the power supply unit, a transformer which converts the alternative course (110 or 220 volts) into D.C. current low tension for the function of the computer. Its localization is very easy because the cord of food of the alternative course is connected on its back face. It is a gross limps metal, from which leave many wire and connectors intended to provide energy necessary to the computer.

There are who are limp electromechanical connected to the remainder of the computer by in tablecloths gray and flat and the electric connector disk players with four wire coming from the block food.

There are the memories; those appear all as plug-in bars of memory on the mother chart. The first memories were appeared as chips called DIP (Dual Inline Package). From now on the memories are generally in the shape of bars, i.e. plug-in charts in connectors envisaged for this purpose.

With the back of the machine is ports for cables series and parallels bound for external devices, a video port for raccorment of the monitor, the connectors for keyboard and mouse, in addition to the connectors for device like SCSI, joysticks etc.