HARDWARE

The system unit is the main part of a desktop computer.It includes the motherboard, CPU , RAM, and other several components.The system unit also includes the case that covers the internal components of the computer.

The term "system unit" is often used to differentiate between the computer and peripheral devices, such as the monitor or keyboard.The syste

m board (or mother board in the system unit) consists of a flat board which contains the CPU , memory chips and other devices.

PU:The central processing unit (CPU) is the center of all computer processing activities.It is here that all processing is controlled,all data are manipulated and arithmetic calculations are performed.

Main Memory (Primary Storage):The main memory consists of Registers, Cache memory, Random Access Memory (RAM) and Read Only Memory (ROM). Registers are located in the Control Unit and Arithmetic/Logic Unit of a CPU

Ache Memory:Cache memory pronounced as "cash" is located between RAM and CPU for faster access. It is a special high speed memory area that the CPU can access quickly.

RAM:Random-access memory (RAM) is the memory which can store temporary info or programs when the computer power is on.

ROM:ROM usually stores very important datas permanently. ROM consists of microinstructions hardwire into the computer.

System Clock:Part of the computer performance is controlled by the speed of system clocks. The system clock organizes how often the operation will occur in a computer.

Power Supply:A computer runs on direct current (DC) but the available electricity from a standard outlet is alternating current (AC). The power supply is a device that converts AC to DC to run the computer.

Bus Lines:A bus line is an electrical device through which bits are transmitted between the CPU and other devices. It has different various types.