1.2.1 History of Computers
3000 B.C. Abacus Abacus is the first manual calculating device developed by the Chinese in 3000 BC. It consists of a rectangular frame having a series of vertical rods on which a number of wooden beads are allowed to slide freely. A horizontal beam of mid bar separates the frame into two sections, known as upper deck and the lower deck. On the upper deck of each rod are two beads and on the lower deck five beads are. Each bead in the upper deck has a value of five; each bead in the lower deck has a value of one. 1617 Napier's Bone John Napier,a Scottish Mathematician and an astronomer, played a key role in the history of computing. He developed the system of logarithms in 1614 AD. The invention of logarithms was an important breakthrough in the development of mathematics and computing devices. He also invented a small instrument called Napier's Bone in 1617 AD, which consisted of multiplication tables inscribed of a set of 10 rods, which were further divided into 9 diagon...