“Inside story”- Computer Science

In this note I will discuss some more facts about our own computers. The computer which we use now is a 4th generation computer. Just imagine the 1st generation computer, it took a large space for accommodation (near about a 600x200 sqft room). Moreover the machines needed to be kept in an air-conditioned room so that it doesn’t get excessively hot. But now they don’t require them, moreover the 1st generation computer was built with the help of large vacuum tubes (like the CRT –cathode ray tube) but now the computer uses extremely small IC’s (integrated circuits).
If we move onto some for detail we will find that computer works with the help of some Logic gates namely the AND, OR and NOT gates, each gate is symbolically represented by following figures:-

We have more gates like the NAND, NOR, XOR and XNOR gates. This gates are use in various combinational circuits like the encoder, decoder and Multiplexer and the demultiplexer.
To be continued.............................................