Generations of the Computer. First Generation 1946 - 1959.

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Slide 1Generations of the Computer Slide 2 First Generation 1946 - 1959 Slide 3 First Generation (1946 1959) Key Component Vacuum Tubes Very large and bulky No memory Programmed in Machine Language Very expensive to run Used great amounts of power In constant repair Not reliable Input Punch cards Slide 4 Vacuum Tubes Vacuum tubes are sealed glass used in electronic circuitry to control the electrons sealed inside the tubes. They are used for: the amplification of weak currents, rectification of an altering current to direct current (AC to DC), generating of oscillating radio-frequency power for radio, radar, and more. Some of the earliest forms of a vacuum tube were recorded in the late 17 th century but it wasnt until 1850 when they created sophisticated versions of vacuum tubes. Some of the first computers were made out of vacuum tubes. (1946) Slide 5 Second Generation 1959 - 1965 Slide 6 Second Generation (1959 1965) Key Component Transistors Getting smaller & faster Built for Specific purposes Has memory Magnetic tape replaces Punch cards High-level computer languages (people-oriented such as BASIC & COBOL) First commercial computers Can only do 1 program at time Slide 7 Transistor Created by Julius Edgar Lilienfeld. The transistor is a semiconductor used to amplify a switches electronic signals. Transistors are made with a semiconductor material with at least three terminals. They can be built very compact, more than 1,000,000 per square centimeter on a silicon chip. Replaced vacuum tubes. Patented-1925 Used on the telephone-1947 Used on computers late 1950 s through 1960 s. Transistors are what we use to make the computer code of 1 s and 0 s much faster. They can be switched on and off very rapidly by switching every 0.000000001 Seconds. By:Chris Woof Slide 8 Third Generation 1965 - 1971 Slide 9 Third Generation (1965 1971) Key Component Integrated or Etched Circuitry Mini-computers Operating speeds measured in billionth of a second Multi-processing Keyboards Computer Literacy begins Slide 10 Fourth Generation 1971 - Slide 11 Fourth Generation (1971 - ) Key Component Microprocessors (Micro Chips) Micro-computers (Personal computers) Can be mass-produced Data communication networks (Internet) Slide 12 Microprocessor The microprocessor is also known as the CPU (or the brain of the computer). It is connected to the circuit board.

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