5. Input unit links the external environment with the
computer system. Data and instruction must be
entered to the computer before performing any
competition. Data or instructions can be entered
through input devices
6. accepts data or instructions from external world.
· It converts these instructions and data in
computer acceptable form.
· It supplies the converted instruction & data to
the computer for further processing.
8. keyboard
A keyboard is the set of typewriter-like keys that
enables you to enter data into a computer. Computer
keyboards are similar to electric-typewriter keyboards
but contain additional keys. The keys on computer
keyboards are often classified as follows:
10. Numeric keypad
A numeric keypad, numpad or ten key, is the small,
palm-sized, seventeen key section of a computer
keyboard, usually on the very far right. The numeric
keypad features digits 0 to
9, addition (+), subtraction (-), multiplication (*) and
division (/) symbols, a decimal point (.) and numlock
and enter keys
11. Mouse
A mouse is an input device that you can move as
the pointing flat surface(usually on a desk or
keyboard)
A device that controls the movement of
the cursor or pointer on a display screen.
12. Processing
ALU is the place where actual execution of the
instructions takes places during the processing
operations. All calculations & comparisons are made in
the ALU. The data and instructions stored in the
primary storage are transphered as where required.
Intermediate results are also transp hered back to the
ALU for the final processing. After completion of
processing the final results are send to storage units
from ALU.
13.
14. Storage
Before actual processing start, data & instructions
entered to the computer must be stored inside the
computer. Similarly, results produced by the
computer are required to be stored before being
passed to the output unit. The intermediate result
produced by the computer must also be stored for
further processing. In short the function of
storage unit:
15. Storage
It stores all the data to be process.
It stores intermediate results.
It stores final result are realize an output device.
17. • The job of output unit it is just the viewers of
that any input unit it provides information
reasons of computation to the output of the
world. Output unit links the computer with
the external world. A computer prepares
results in binary code. Output unit converts
these results into human acceptable forms. In
short perform the following functions.
18. Output
It accepts the result produced by the
computer.
It converts these coded results to human
acceptable form.
It supplies the converted to the outside
world.
19.
20. Inkjet printer Vs laser printer
Ink jet printers "blow" or shoot a tiny spot of ink as the
printer head moves across the paper. Laser printers use
a complex process of putting a charge on a heated
metal drum that is affected by the laser to produce the
characters and graphics that are to be printed.
