History of computer

• Abacus - 3000 BC
• Abacus - It used to perform basic arithmetic operations.
• An abacus is a mechanical device used to aid anindividual in performing mathematical calculations.
• Slide Rule -1630
• slide rules - used for primarily for multiplication, division, roots, logarithms, Trigonometry
• Pascaline - In 1642 Blaise Pascal, improved the abacus by replacing its beads with wheels.
• Pascaline - was limited to addition and subtraction
• Pascaline - was way too expensive back then
• Stepped Reckoners - Invented by Gottfried Wilhelm Leibniz in 1672.
• Stepped reckoners - The machine that can add, subtract, multiply and divide automatically.
• Jacquard Loom - is a mechanical loom, invented by Joseph-Marie Jacquard in 1881.
• Jacquard loom - It an automatic loom controlled by punched cards.
• Difference Engine and Analytical Engine - It an automatic, mechanical calculator designed to tabulate polynomial functions.
• Difference Engine and Analytical Engine - Invented by Charles Babbage in 1822 and 1834
• Difference Engine and Analytical Engine - It is the first mechanical computer.
• First Computer Programmer - In 1840, Augusta Ada Byron suggests to Babbage that he use the binary system.
• First Computer Programmer - She writes programs for the Analytical Engine.
• Tabulating Machine - Invented by Herman Hollerith in 1890.
• Tabulating machine - To assist in summarizing information and accounting.
• Havard Mark 1 - Also known as IBM Automatic Sequence Controlled Calculator (ASCC).
• Havard Mark 1 - Invented by Howard H. Aiken in 1943
• Havard Mark 1 - The first electro-mechanical computer.
• Z1 - The first programmable computer.
• Z1 - Created by Konrad Zuse in Germany from 1936 to 1938.
• To program the Z1 required that the user insert punch tape into a punch tape reader and all output was also generated through punch tape.
• Atanasoff-Berry Computer (ABC) - It was the first electronic digital computing device.
• Atanasoff-Berry Computer (ABC) - Invented by Professor John Atanasoff and graduate student Clifford Berry at Iowa State University between 1939 and 1942. 
• ENIAC (Electronic Numerical Integrator and Computer) - It was the first electronic general purpose computer.
• ENIAC - Completed in 1946.
• ENIAC - Developed by John Presper Eckert and John W. Mauchly.
• The UNIVAC I (UNIVersal Automatic Computer 1) was the first commercial computer.
• UNIVAC 1 - Designed by J. Presper Eckert and John Mauchly.
• EDVAC (Electronic Discrete Variable Automatic Computer) - The First Stored Program Computer
• EDVAC - Designed by Von Neumann in 1952.
• EDVAC - It has a memory to hold both a stored program as well as data.
• Osborne 1 – the first portable computer.
• Osborne 1 - Released in 1981 by the Osborne Computer Corporation.