THE INPUT UNIT IS RESPONSIBLE FOR ACEEPTING INPUT i.e., DATA
INSTRUCTIONS FROM THE USER.THIS WORK IS ACCOMPLISHED WITH THE HELP
OF INPUT DEVICES. EXAMPLE:-KEYBOARD,MOUSE, MICROPHONE etc.
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THE MOUSE IS POINTING DEVICE WITH A ROLLER ON ITS BASE. MOUSE
CONTROLS MOVEMENT OF POINTER ON SCREEN. WHEN A MOUSE MOVES ON A
FLAT SURFACE, THE CURSOR ON THE SCREEN ALSO MOVES IN THE DIRECTION
OF MOUSES MOVEMENT. MOUSE GENERALLY HAS TWO OR THREE BUTTONS AND IT
MAY OR MAY NOT HAVE A WHEEL. THE MOUSE IS POINTING DEVICE WITH A
ROLLER ON ITS BASE. MOUSE CONTROLS MOVEMENT OF POINTER ON SCREEN.
WHEN A MOUSE MOVES ON A FLAT SURFACE, THE CURSOR ON THE SCREEN ALSO
MOVES IN THE DIRECTION OF MOUSES MOVEMENT. MOUSE GENERALLY HAS TWO
OR THREE BUTTONS AND IT MAY OR MAY NOT HAVE A WHEEL.
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IMPACT PRINTERS :- IN THESE PRINTERS, THERE IS A MECHANICAL
CONTACT BETWEEN THE PRINT HEAD AND PAPER. EXAMPLE :- NON IMPACT
PRINTERS :- IN THESE PRINTERS, THERE IS NO MECHANICAL CONTACT
BETWEEN THE PRINT HEAD AND PAPER. EXAMPLE :-
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MEMORY DEVICES SECONDARY MEMORY PRIMARY MEMORY
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RAM ROM PRIMARY MEMORY FLOPPY DISKHARD DISK COMPACT DISKDIGITAL
VIDEO DISK SECONDARY MEMORY PRIMARY MEMORY:- IT IS A VOLATILE
MEMORY. SECONDARY MEMORY:- IT IS A NON VOLATILE MEMORY.
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THE CACHE MEMORY IS A HIGH SPEED MEMORY AVAILABLE INSIDE CPU IN
ORDER TO SPEED UP ACCESS TO THE DATA AND INSTRUCTIONS STORED IN RAM
MEMORY. TWO TYPES OF CACHE MEMORY ARE:- 1.LEVEL 1 { L1 } CACHE ;-
BUILT INSIDE THE CPU 2. LEVEL 2 { L2 } CACHE :- EXTERNAL TO THE CPU
AND RESIDES ON THE MOTHERBOARD