| A | B |
|---|
| The abacus | was used 5000 years ago for counting. Consists of a frame with wires holding a number of balls that can be moved along them. |
| Blaise Pascal | A Frenchman who invented the first real calculating machine (additions and substractions) |
| Gottfried Leibniz | Born in Saxony, he used the binary system to simplify the number of wheels and cogs a calculator needed. |
| Charles Babbage | Considered the inventor of the computer. He was born in England. |
| Babagge | His first machine was the "Difference Engine" (it did certain types of calculations). His improved version was called "The Analytical Engine" (To sole any sort of calculation). |
| Herman Hollerith | Invented the Tabulating Machine in 1887. He combined Jacquard Cards with electricity. |
| Hollerith | He founded the Tabulating Machine Company in Washington, and changed its name to the International Business Machine Corporation (IBM). |
| 1940's | The beginning of the modern computers. |
| Howard Aiken | He produced the Harvard MArk I for IBM (1943). |
| The Harvard Mark I | It was enormous,expensive, very slow, very noisy, and not very reliable. |
| Alan Turing | He created the "Collossus Machine". |
| J. W. Mauchley | He presented the Electronic Numerical Integrator and Calculator (ENIAC). |
| Jacquard Cards | Pieces of paper with holes placed at regular intervals.Also named as punch cards. |
