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2008-02-09T00:47:00.001-08:00

The first computers were expensive room- sized machines that only business and government offices could afford. Today most computers are smaller, and many people have one in their own home or school. These 'personal computers' first appeared in the mid - 1970s.
Computers can find the answers to many maths problems and can simlify work that has many steps and would otherwis take lots of time. They can do this because they can remeber,in order,the in dividual steps of even long and comlicated instructions.
The sets of instructions for computers are called 'programs' or 'software'.A computer's brain is its microprocessor-a tiny eletronic device that reads and carries out the program's instructions.
Because they are programmed in advance,you can use computers to solve maths problems, remember facts, and play games. Computers can also help you draw, write essays, and make your own greetings cards.
Computers need two kinds of memory. 'Main memory' is what handles the information that the computer is using as it is doing its work.
Main memory operates amazingly fast and powerfully to speed up a computer's work. The second kind of computer memory is storage for its programs and for the results of its operations. The most important storage space is on the computer's hard disk.CD-ROMs and floppy disks are removable storage devices.
Since 1990 very small computers have been developed. Today there are laptop or notebook computers, as well as handheld computers. Handheld computers weigh only a few grams, but they can handle more data more quickly than most of the first giant computers.

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