Classification of computer

Computer system are classified into four categories depending on size and work load  vis  1 .MICRO COMPUTER 2. MINI COMPUTER 3. MAIN FRAMES 4. SUPER COMPUTER

Name	Example	Uses	Amount
Micro Computer	Personal Computer, work station Computer	easy to use, Home  office user, Powertal and for Complex program	affordable price, expensive
Mini Computer	client/server	Mini Computer are used heavily in transaction & manufacturing unit	Middle Range
Main FRAMES Computer	IBM SYSTEM	it is mainly used in insurance company, Bank , Airline etc for multiple user	Expensive
Super computer	PARAM,CRAY 1 &2	Fastest and most powerful mechine for long data calculations	very expensive

Basic of computer organisation

The Mordan computer architecture is based on John Von Newourn architecture.

INPUT

CPU  MEMORY       CONTROL UNIT ARITHMETIC & LOGIC UNIT

OUTPUT

INPUT DEVICE    :- AN input device used to enter data and instructions into COMPUTER 

For example :-  

  

1. 
   Scanner
2. 
   OMR (optical Mark Reader)
3. 
   Bar code Reader
4. 
   MICR(Magnatic Ink Character Recognition)  
5. 
   Keyboard

OUTPUT DEVICE :- An Out put device is an Electronic mechanical device that accepts data from computer and translates them into a suitable from for use by outside world.

                                    Output Devices generate computer output that are broadly  categories in two types 

• soft copy output 
• Hard copy output

Soft copy output :- A soft copy output is temporary in nature because it does not appear on a  pepar or some material. Example of soft copy output  Monitor

 Monitor :- Monitor are three types 

1. 
   CRT (CATRODE RAY TUBE)
2. LCD (LIQUID CRYSTAL DISPLAY)
3. LED( LIGHT EMISSION DISPLAY)

Hard copy output :-A hard copy output is permanent in nature because it appears on a paper or some material. 

Example of hard copy output printer.

Printer are bodly two types 

-3

1. 
   .Inkject printer 

• Lesar printer
  What is computer ?