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
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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
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.
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