3First Generation (1946 – 1959) Key Component – Vacuum Tubes Very large and bulkyNo memoryProgrammed in Machine LanguageVery expensive to runUsed great amounts of powerIn constant repairNot reliableInput – Punch cards
4Vacuum TubesVacuum 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 17th 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)
6Second Generation (1959 – 1965) Key Component – Transistors Getting smaller & fasterBuilt for “Specific” purposesHas memoryMagnetic tape replaces Punch cardsHigh-level computer languages (people-oriented such as BASIC & COBOL)First commercial computersCan only do 1 program at time
7Transistor 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.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 WoofPatented-1925Used on the telephone-1947Used on computers late 1950’s through 1960’s.