what is system unit?

                                                             

SYSTEM UNIT

Definition

The system unit, also known as a "tower" or "chassis," is the main part of a desktop computer. It includes the motherboard, CPU, RAM, and other components. The system unit also includes the case that houses the internal components of the computer.

Function

The term system unit is generally used to differentiate between the computer itself and its peripheral devices, such as the keyboard, mouse, and monitor. The primary function of the computer system unit is to hold all the other components together and protect the sensitive electronic parts from the outside elements.

Component

Motherboard – a system core. Actually, it is the heart of a computer. Other system elements are connected to the motherboard, and the whole system is managed and controlled by it. The motherboard contains special chips on which some ICs (Integrated circuits) are etched. A motherboard is one of the most essential parts of a computer system. It holds together many of the crucial components of a computer, including the central processing unit (CPU), memory, and connectors for input and output devices.

Processor – a computer engine, its brain. CPU (central processing unit) manages most of computer operations. Processors can be with pins or pin-less. It contains a control unit and a logic unit.

CPU OPERATIONS

The four primary functions of a processor are fetch, decode, execute, and store.

Fetch- is the operation that receives instructions from program memory from a system's RAM.

Decode- this is where the instruction is converted to understand which other parts of the CPU are needed to continue the operation. This is performed by the instruction decoder.

Execute- is where the operation is performed. Each part of the CPU that is needed is activated to carry out the instructions.

Stored- the result is stored in memory.

RAM (random access memory) – primarily memory. It storages all data processed by programs and apps on the computer. There are dynamic and static RAMs.

Dynamic Random Access Memory (DRAM)  

Static Random Access Memory (SRAM)

Hard Drive – a system memory that storages data in the form of archives. Here all our files, folders, operating systems, programs, and applications are saved. Hard drivers can be of two types: PATA (Parallel Attachment Packet Interface) and SATA (Serial Attachment Packet Interface).

Video Card (graphics adapter)- A video card is a piece of computer hardware that's rectangular in shape with numerous contacts on the bottom of the card and one or more ports on the side for connection to video displays and other devices.

Power Supply – A power supply is an electrical device that supplies electric power to an electrical load. The primary function of a power supply is to convert electric current from a source to the correct voltage, current, and frequency to power the load.