Explain the major innovation made from the establishment of abacus to present 5th computer generation.

Calculation using fingers Abacus (6th century BC)Sieve of Eratosthenes (3rd century BC)Napier bonesslide rule Schikard's calculating clock with gearsPascalineStepped reckoner by LeibnizJacquard loom Mechanical computation machines (19th century)Analog computers (first half of 1900-1940)Digital computers (1940-1970)Computers with Microprocessors (1970 onwards)Smartphones (1992 onwards)