Abacus. History of computer.
Napier’s Bone. Year-1617.
Slide Rule. Slide Rule. Year 1620.
Pascalin (year 1642) & Steped reckoner (year 1671).
Difference Engine(year-1822 ) & Analytical Engine(year 1833).
Item 1 Item 2 Item 3 Item 4 Item 5 50 40 30 20 10 0.
Mark-1 ( year-1944 ).
Univac(year 1952).