Trace the history of computer from 12th century till date
tool for use in computation was the abacus, and it was thought to have been invented in Babylon circa 2400 BCE. Its original style of usage was by lines drawn in sand with pebbles. [ [ This was the first known computer and most advanced system of calculation known to date - preceding Greek methods by 2,000 years. Abaci of a more modern design are still used as calculation tools today. The
Antikythera mechanism is believed to be the earliest known mechanical analog computer. It was designed to calculate astronomical positions. It was discovered in 1901 in the Antikythera wreck off the Greek island of Antikythera, between Kythera and Crete, and has been dated to circa 100 BC. Technological artifacts of similar complexity did not reappear until the 14th century, when mechanical astronomical clocks appeared in Europe. In the 3rd century CE the South Pointing Chariot was invented in ancient China. It was the first known geared mechanism to use a differential gear, which was later used in analog computers. The Chinese also invented a more sophisticated abacus from around the 2nd century BCE, known as the Chinese abacus. Mechanical analog computing devices appeared again a thousand years later in the medieval Islamic world. Examples of devices from this period include the equatorium by Arzachel, the mechanical geared astrolabe by Ab? Rayh?n al- B?r?n?, and the torquetum by Jabir ibn Aflah. Muslim engineers built a number of Automata, including some musical automata that could be 'programmed' to play different musical patterns. These devices were developed by the Ban? M?s? brothers and Al-Jazari Muslim mathematicians also made important advances in cryptography, such as the development of cryptanalysis and frequency analysis by Alkindus.  When John Napier discovered logarithms for computational purposes in the early 17th century, there followed a period of considerable progress by inventors and scientists in making calculating tools. ] ]
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