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First generation computer Period : 1945 – 1956 Inviter : Lee de Forest Main processing device : Vacuum tubes Slide 5: Vacuum tube Slide 6: Vacuum tube Slide 7: Vacuum tube Slide 8: Vacuum tube Slide 9: Vacuum tubes Slide 10: Observing Vacuum tube Slide 11: Observing Vacuum tube Slide 12: Vacuum tube tester Slide 13: Punched curds Slide 14: Punched card voting Punched card decks Slide 15: Punched cards models Slide 16: Large punched cards Slide 17: . First generation computer Advantages : . It was only electronic device . First device to hold memory Disadvantages : . Too bulky i.e large in size . Vacuum tubes burn frequently . They were producing heat . Maintenance problems Slide 18: Too bulky i.e large in size Slide 19: Vacuum tubes burn frequently Slide 20: Maintenance problems Slide 21: . Second generation computer Period : 1956 – 1963 Inviter : William Shockley Main processing device : Transistor Storage media : Magnetic disc Slide 22: Transistor 1 2 Slide 23: Transistor board Slide 24: . Second generation computer Advantages : . Size reduced considerably . The very fast . Very much reliable Disadvantages : . They over heated quickly . Maintenance problems Slide 25: . Third generation computer Period : 1964 – 1971 Inviter : Jack Kilby Robert Noyce Main processing device : IC (integrated circuit) Storage media : Floppies Slide 26: IC (integrated circuit) Slide 27: ICs (integrated circuits) Slide 28: IC (integrated circuit) Slide 29: . Third generation computer Advantages : . ICs are very small in size . Improved performance . Production cost cheap Disadvantages : . ICs are sophisticated Slide 30: . Fourth generation computer Period : 1971– present Inviter : Ted Hoff Main processing device : ICs with VLSI (Very Large Scale Integration) Storage media : Floppies, CDs. Slide 31: ICs with VLSI (Very Large Scale Integration) Slide 32: . Fourth generation computer Advantages : . It is a compact . Less power consumption . Production cost is cheap Disadvantages : . No artificial intelligent. Slide 33: . Fifth generation computer Period : present and beyond Main processing device : ICs with parallel processing Storage media : Video disks Advantages : . Artificial intelligence . Expert system Slide 34: . First generation computer . Second generation computer . Third generation computer . Fourth generation computer . Fifth generation computer Vacuum tubes Transistors ICs ICs with VLSI ICs with parallel processing Slide 35: Characteristics of a computer Computer is a group of electronic devices used to process the data. The characteristics of a computer are: 4. Accuracy 5. Automation 6. Functionality 7. Tirelessness 1. Speed 2. Reliability 3. Memory capacity Slide 36: Speed: computer process the data at an unimaginable speed. The speed of the computer ranges up to Nano seconds. 2. Reliability: The next important characteristic of a computer is its reliability. we can always rely on the information given by a computer. 3. Memory capacity: The memory capacity of a computer is measured in in bits and bytes. Large amount of the data can be stored in computer and retrieved. Memory capacity of the computer ranges in Giga bytes. Slide 37: 4. Accuracy: Accuracy of the computer is very high it performs calculation with greater accuracy in less time. 5. Automation: a computer allows automation for any process designed in the from of a program. A program can be executed any number of times to repeat the process. Slide 38: 6. functionality: computer can performs many kinds of jobs. They not process the data but also can be Used for plying music, movies, and printing jobs. It finds its applications in all most all the fields. 7. Tirelessness: A computer never gate tired. 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