SUBJECT NAME: BASIC COMPUTER SKILLS. What is computer ? A device that computes, especially a programmable electronic machine that performs high-speed.

Slide 1 SUBJECT NAME: BASIC COMPUTER SKILLS Slide 2 What is computer ? A device that computes, especially a programmable electronic machine that performs high-speed mathematical or logical operations or that assembles, stores, correlates, or otherwise processes information. One who computes. It’s a Programmable machine that can store, retrieve, and process data. Today's computers have at least one that performs most calculations and includes a main memory, a control unit, and an arithmetic logic unit. It’s a Programmable machine that can store, retrieve, and process data. Today's computers have at least one CPU that performs most calculations and includes a main memory, a control unit, and an arithmetic logic unit.CPU Slide 3 Charles Babbage (1791-1871) THE FATHER OF COMPUTER Slide 4 Slide 5 Computer can classified in to five types according to generations i.e time period. First generation computer. Second generation computer. Third generation computer. Fourth generation computer. Fifth generation computer Slide 6 . First generation computer Period : 1945 – 1956 Inviter : Lee de Forest Main processing device : Vacuum tubes Slide 7 Vacuum tube Slide 8 Slide 9 Slide 10 Slide 11 Vacuum tubes Slide 12 . 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 13 Too bulky i.e large in size Slide 14 Vacuum tubes burn frequently Slide 15 . Second generation computer Period : 1956 – 1963 Inviter : William Shockley Main processing device : Transistor Storage media : Magnetic disc Slide 16 Transistor 1 2 Slide 17 Transistor board Slide 18 . Second generation computer Advantages :. Size reduced considerably. The very fast. Very much reliable Disadvantages :. They over heated quickly. Maintenance problems Slide 19 . Third generation computer Period : 1964 – 1971 Inviter : Jack Kilby Robert Noyce Main processing device : IC (integrated circuit) Storage media : Floppies Slide 20 IC (integrated circuit) Slide 21 ICs (integrated circuits) Slide 22 IC (integrated circuit) Slide 23 . Third generation computer Advantages :. ICs are very small in size. Improved performance. Production cost cheap Disadvantages :. ICs are sophisticated Slide 24 . Fourth generation computer Period : 1971– present Inviter : Ted Hoff Main processing device : ICs with VLSI (Very Large Scale Integration) Storage media : Floppies, CDs. Slide 25 ICs with VLSI (Very Large Scale Integration) Slide 26 . Fourth generation computer Advantages :. It is a compact. Less power consumption. Production cost is cheap Disadvantages :. No artificial intelligent. Slide 27 . Fifth generation computer Period : present and beyond Main processing device : ICs with parallel processing Storage media : Video disks Advantages :. Artificial intelligence. Expert system Slide 28 . First generation computer. Second generation computer. Third generation computer. Fourth generation computer. Fifth generation computer Vacuum tubesTransistors ICs ICs with VLSI ICs with parallel processing Slide 29 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 30 1.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 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 31 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 form of a program. A program can be executed any number of times to repeat the process. Slide 32 6. functionality: computer can performs many kinds of jobs. It not only process the data but also can be Used for playing music, movies, and printing jobs. It finds its applications in all most all the fields. 7. Tirelessness: A computer never get tired. Slide 33