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Generations of the Computer. First Generation 1946 - 1959.

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Presentation on theme: "Generations of the Computer. First Generation 1946 - 1959."— Presentation transcript:

1 Generations of the Computer

2 First Generation

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

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 wasn’t until 1850 when they created sophisticated versions of vacuum tubes. Some of the first computers were made out of vacuum tubes. (1946)

5 Second Generation

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

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 Seconds.  By:Chris Woof

8 Third Generation

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

10 Fourth Generation

11 Fourth Generation ( ) Key Component – Microprocessors (Micro Chips) Micro-computers (Personal computers) Can be mass-produced Data communication networks (Internet)

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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