Timeline of the Digital Revolution

1300 The abacus was begining to be used.
1623 Wilhelm Schickard invented the "Calculating Clock." It could add and subtract. It was the first real calculating machine
1644 Blaise Pascal invented the "Pascaline," an adding machine. It could not subtract.
1674 Gottfried Leibnitz designed the "Stepped Reckoner." It could add, subtract, and multiply.
1786 J. H. Mueller conceived the "difference engine" that would calculate values for a polynomial.
1820 Charles Colmar invented the "Arithmometer." The first mass-produced calculator. It did multiplication and with assistance could do some division.
1822 Charles Babbage reinvented the difference engine. He began a government project to build one. The complete engine would be room-sized.
1834 Babbage conceived the "Analytical Engine." This machine had read only memory, in the form of punch cards. It was able to do addition in 3 seconds and multiplication or division in 2-4 minutes.
1842 The British Government canceled Babbage's difference engine project.
1886 Dorr E. Felt invented the "Comptometer," the first calculator operated by pushing buttons instead of dialing in the numbers.
1889 Felt invented the first printing desk calculator.
1935 Konrad Zuse patented mechanical memory.
1939 John V. Atanasoff created the first calculator to use vacuum tubes.
1941 Zuse completed the first fully programmable calculator.
1943 Howard H. Aiken completed "Harvard Mark I." It is the first programmable calculator to become widely known.

Construction began on the ENIAC
1945 ENIAC was operational
1947 Magnetic drum memory was invented by several people, independently.

Three scientists at Bell Telephone Laboratories, William Shockley, Walter Brattain, and John Bardeen demonstrated their new invention of the point-contact transistor amplifier.
1948 "Mark I" was completed at Machester University. It was the first machine that fit the modern definition of a computer, because it had stored-program capability.

John Bardeen, Walter Brattain, and William Scholckley of Bell Labs filed for a patent on the first transistor.
1952 G.W. Dummer, a radar expert from Britain's Royal Radar Establishment, presented a paper proposing that a solid block of materials be used to connect electronic components, with no connecting wires.
1954 Texas Instruments announced the start of commercial production on silicon transistors.
1958 Texas Instruments demonstrated the first integrated curcuit.
1959 Fairchild Semiconductor filed a patent application for the planar process for manufacturing transistors. The process made commercial production of transistors possible.
1960 IBM developed the first automatic mass-production facility for transistors.
1962 Ivan Sutherland created a graphics system called Sketchpad.
1964 "Basic" programming language was created.
1967 IBM created the first "floppy disk."
1968 Douglas Engelbart created a system including a keyboard, keypad, mouse, and windows. He also demostrated a word processor and a hypertext system.
1969 Intel created a 1KB RAM chip.
1970 The 4004 processor was created.

Intel created the 1103 DRAM chip.