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lesson1

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									Objectives
“To understand a Digital or Modern Computer & its functional Block Diagram”


Apparatus
An IBM Personal Computer with its essential accessories.


Introduction

        Computer is defined, sometimes, as an electronic slave
        or “machine that takes input & processes it to produces
        any logical output.”

The von Neumann Model of the PC

Computers have their roots 300 years back in history. Mathematicians and philosophers
like “Pascal”, “Leibniz”, “Babbage” and “Boole” made the foundation with their research
& experiments. Only in the second half of 20th century the electronic science was
sufficiently developed to make practical use of those proposed theories.

Aspects of Computer Classification
Computers are generally classified on the basis of “Function”, “Purpose” & “Capability”.

         Based on functions, the computers may be “Analog”, “Digital”, “Hybrid” or
          “optical” computer.
         Computers can be identified as “General / Special purpose” computers.
         “Microcomputers”, “Mini-computers”, „Main-frame” & “Super computers” can
          be distinguished by their capabilities.

1833, Charles Babbage„s Analytical Engine [A functional view]


                                     STORE



           INPUT                  CONTROL                         OUTPUT


Figure: 1.1 Heat Engine               MILL
A Modern Computer Processing & Block Diagram
http://www.unm.edu/~tbeach/terms/net.html

          STEP 1                     STEP 2                    STEP 3


          INPUT                   PROCESSING                    OUTPUT


                                      ===

                                Central Processing
                                      Unit
        INPUT                                                     OUTPUT
                                 (ALU+CU+MU)




                                Secondary Storage

Figure: 1.2 Modern Computer Model & illustration of steps


Comments
Inspiring from his work on heat engine, he was entitled as “father of computer”.



IBM PC s‟ Evolution (1981)

The PC came out in 1981. In less than 20 years, it has totally changed our means of
communication. When the PC was introduced by IBM, it was just one of many different
micro data processors, however in 5-7 years it had conquered the market. From being an
“IBM PC”, the name became the “standard”.



WWW drill
Search for “Computer History”

								
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