If you think the computer has made in the last century, inevitably wrong, yes I mean a computer screen and keyboard and you're right, but the computer name means that a device that is simple and complex calculations at high speed, and former civilizations had computers with operations in different areas, they have invented computers to assist them in the development of science and research, such as ancient Greek Antikythera computer.
Found on the island of Antikythera on computer in an old ship wreck, believed that this computer back to between 100-150 b.c. any more than 2000 years of our times, this computer belonged to the Greek civilization, and it is possible that the workmanship is of the Greek astronomer Hipparchus, due to the mechanical device works and theories on which some of the theories developed by Hipparchus himself.
It is believed that this computer was used for astronomical and predict an Eclipse, as it contains many pieces and indicators that were moving to denote a particular zodiacal, system work on ancient Egyptian solar calendar, some studies have confirmed that this computer was running with high accuracy and a very small error in astronomical predictions.
Of course, many of the pieces are non-existent and the rest corrupted too, after its discovery it was rebuilt some modifications to discover more of algkaek around, but so far there are still some things unclear, did not know about this device.
This discovery proves that earlier civilizations of the science, and has been able to evolve and reinvent the sophisticated machinery and modern for their time, and it is known that so far did not discover anything mentioned of machines and devices used in their ages.