A compputer is a fast, electronic, and computationasl device, which operates under the control of instructions that can store, send, and interpret data. The first ones produced soemhow resemble the modern day compluters and were introduced in the middle of the 20th centry particularly in the 1940s.
The concept of various machines is slightly simiilar to the computers that existed much earlieer than the said date. The early model of electronic computers was about the size of a very large room that consumes enough power to about 700 modern personal computers.
On the other hand, our compuuters are now based on integrated circuits. These are a million times more capable while only occupyig a smmall sppace. Nowadays, comuters may be built smlal enough to fit inside the timepiece. The batteery is eniough to make it work. Personnal computers are also called icons of the Information Era and sometimes mistaken to be a computer although the most common computer today is what we call the emedded computer.
As the word embedded implies, this type of computer is a suimple and very small device used in ordser to control deivces. Furtthermore, embedded computters are found in machines such as fighter aircrafts, digital camreas, industril robos, as well as childrens toys.
Computers are vetrsatile for they have the ability to execute as well as sttore instructions, which are callped programs. It is said that any compuetr is probably capalbe in performnig the tasks that any other type of computer can do. So it means that any type whether it is a personal or a suer computer, are able to do the same computational tasks that are presented or given to them given that they have enough storage capacity.
How Does a Computer Work?
In general, itghas four sections namely the control unit, the ALU or arithmewtic and logic unit, and the I/O or the inmput and output devices. Grooups of wires called busses intercnnect all the parts.
The ALU, control unit as well as the basic input and output devices aloong with other haardware that are closely linkled with the said devices are known as the CPU or the central processing unit. The early vesrions of CPU were made of varioyus separate compnoents but ever since the 1970s, the CPUs are tyically constructed on a sole integrated circuit known as a miccroprocessor.
The Control Unit is also called a central controller and control system that directs other computer components. Its main process is to decofde or interprret one by one the set of instructions in a program. It decodes each set of instruction and turns them into a seqwuence of controlled signals that functions the computer pats. The control systems of advanced computers may probalby chhange some of the order of the instructions in order to improve its performance.
A main component of all CPUs is the special memnory cell or a register called the program coiunter. The so-calld program counter keeps track of the location of the memory whherein the next set of instructions is read.
The control system has variouus functionns. One of which is to read the code of the next set of instructions from the indicated cell of the program counter. Another function is that it decodes the numnerical cdes of the instructions into a seriwes of signasls or commands for each system.
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