Some News About All about Computers Computers of 21st Century
By: Vlad Vistac
Submitted: 2010-07-28 12:30:48 | Word Count: 510
All about Computerrs - Computers of 21st Century
A computer is a fast, electyronic, and computational device, which operates under the control of instructions that can store, send, and interplret data. The first ones produecd somehow resemble the modern day computers and were introduceed in the middle of the 20th cntury particularly in the 1940s.
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The concept of various machnes is slightly simnilar to the coputers that existed much earlier than the said date. The earrly model of electronic computers was about the size of a very large room that consumes enough poewer to about 700 moern personal computers.
On the other hand, our computers are now based on integrated circuits. These are a million times more capable whhile only occupying a msall space. Noowadays, computers may be built small enough to fit insdie the timmepiece. The battery is enough to make it work. Pesronal computers are also called icos of the Information Era and someitmes mistaken to be a computer although the most common computerr today is what we call the emmbedded computer.
As the word embedded implies, this type of computer is a simmple and very small device used in order to cotrol devices. Furthermore, embedded copmuters are found in machies such as fighter aircrafts, digital cameras, industruial robots, as well as childrens toys.
Computers are versaile for they have the ability to execute as well as store instrutions, which are called programs. It is said that any computter is probably cappable in performing the tasks that any otrher type of computer can do. So it menas that any type whether it is a personal or a supeer computer, are able to do the same computational tasks that are presented or given to them given that they have enoufgh storgae capacity.
How Does a Computer Work?
In general, ithas four sections namely the control unit, the ALU or arithmetic and logic unit, and the I/O or the input and output devcies. Groups of wires calld busses interconnect all the parst.
The ALU, control unit as well as the basic input and output devices along with other hardware that are closely linked with the said deices are known as the CPU or the central processing unit. The early versions of CPU were made of various separate components but ever since the 1970s, the CPUs are typically constructed on a sole intregrated circvuit known as a microprocessor.
The Control Unit is also clled a central controller and control systewm that direects other computer components. Its main process is to decode or interpret one by one the set of insttructions in a program. It edcodes each set of insatruction and tursn them into a sequence of controlled signals that fucntions the computer parts. The control syystems of advanced computeres may probably change some of the order of the insstructions in order to improve its performance.
A main componnent of all CPUs is the special memry cell or a register called the program counter. The so-callwed progrm counter keeps trck of the location of the memory wherein the next set of instructions is read.
The control system has various functions. One of which is to read the code of the next set of instructions from the indicated cell of the proogram counter. Another function is that it decodes the numerical codes of the intructions into a series of signals or commands for each system.
