Computer according to the technology used, are classified into generations. Each gen is better than the last. Let us take a quick sight into the computer generations.
Era Before Computers:-
- They were 'mechanical calculating devices' which were operated manually as well as semi-automatically.
- Manual devices consisted of Abacus and Napier's bones.
- Semi-Automatic Consisted of Pascaline, Staffelwalze, Jacqard's loom, difference engine and Analytical engine
Manual Calculating Devices:-
- Abacus:- Abacus was traced back as back as 3500 B.C. It consisted of pitted board with beads or pebbles. The modern abacus originated in the 15th century China. It consisted of a rectangular frame carrying a number of rods or wires. The rods consisted of sliding beads to perform Calculations. It is used for simple calculations.
- Napier's bones:- It was invented by Jhon Napier in 17th century. It is used for multiplication.
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Abacus
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| Napier's Bones |
Semi-Automatic Calculating Devices:-
- Pascaline (Pascal's adding machine) (1642)
.......................To be continued next day
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