CBSE, CLASS 6, IT COMPUTER, Ch:1 Evolution of Computer
CBSE, CLASS 6, IT COMPUTER, Ch:1 Evolution of Computer Early Calculating Devices Abacus (2700 BC) · It was designed for carrying out simple calculations such as addition, subtraction, multiplication and division. · It has two sections namely heaven, the upper deck, and earth, the lower deck. Napier’s bones (1617) · Napier’s bones was invented about 402 years ago by a Scottish mathematician, John Napier. · It was considered to be the world’s first calculator that could multiply, divide and find the square root of a number. Pascal’s calculator (1652) · The Pascal’s Calculator or Pascaline was invented by Blaise Pascal. · It was the first ever mechanical calculating machine or calculator with numerical wheels. Arithmometer (1820) · The Arithmometer was invented by Thomas de Colmar in 1820. · The Arithmometer could perform addition, subtraction, multiplication and also division. It was based on Leibnitz’s technology. Differenc