Introduced by Alan Turing in 1936, Turing machines are one of the key abstractions used in modem computability theory, the study of what computers can and cannot do.A Turing machine is a particularly simple kind of computer, one whose operations are limited to reading and writing symbols on a tape, or moving alone the tape to the left or right. The tape is marked off into squares, each of which can be filled with at most one symbol.
Vacuum Tube - 1904
Vacuum Tube is just that a glass tube surrounding a vacuum ( an area from which all gases has been removed). What makes it interesting is that when electrical contacts are put on the ends you can get current to flow though that vacuum. A British scientist named Jhon A Fleming made a vacuum tube known today as diode.
ABC - 1939
The Atanasoff-Berry Computer was the world's first electronic digital computer. It was built by Jhon Vincent Atanasoff and Clifford Berry at Lowa State University During 1937-42. It incorporated several major innovations in computing including the use of binary arithmetic, regenerative memory, parallel processing, and separation of memory and computing functions.
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