2. INTRODUCTION ON COMPUTER COMPONENTS OF COMPUTER INPUT DEVICES
PROCESSOR (CENTRAL PROCESSING UNIT) OUTPUT DEVICES STORAGE OR
MEMORY UNIT 3. Now-a-days computer is playing a mainrole in
everyday life as it hasbecome the need of people just
liketelevision, telephone or otherelectronic device at
home.Technically , a computer is aprogrammable machine. This means
itcan execute a programmed list ofinstructions and respond to
newinstructions that are given. Todaythe term is most often used to
refer 4. INPUT DEVICES PROCESSOR (CENTRAL PROCESSING UNIT) OUTPUT
DEVICES STORAGE OR MEMORY UNIT 5. The input is first given to the
processor byinput devices . These devices which supply thefeed or
information to the main machine , i.e.the CPU , for the beginning
of the IPO cycle iscalled an input devices . Some input devicesare:
Keyboard Mouse Scanner Digital camera Microphone Tablet Light pen
Joystick3 6. After the input is received ,it goes to the processing
unit. The central processing unitis called CPU , processer
ormicroprocessor. It is alsoknown as brain of the computer.The CPU
is the device thatreceives various types of inputand produces
output. The CPUhas 3 major parts. They are:control unit(CU),
Arithmeticand Logic unit(ALU), and Memoryunit(MU). 7. The various
parts of the computers CPUis directed by control unit. The
controlunit can be described as the manager ofthe CPU. Its sole
purpose is to guideother mechanisms in the system tocomplete
specific tasks. The controlunit fetches instructions from memoryand
decodes them to produce signalswhich controls the other parts of
thecomputer. These signals cause it totransfer data between memory
and ALU toactivate peripherals to perform input oroutput. 8. Ii is
one of the most important partof computers CPU . It comprise
ofelectronic circuits that make itcapable of executing arithmetic
andlogic operations. It has a ability toperform 4 types of
functions:addition, subtraction, multiplicationand division. It can
also perform 3logical operations: equal-to, less-then and
greater-then.3 9. It is a part of the computer in whichinformation
is stored for the centralprocessing unit. A computer consistsof two
types of memory: RAM and ROM.3RAM ROMIt stands forRandom
AccessMemory.It stands for ReadOnly Memory.It can be edited. It can
only beviewed it cannotbe edited. 10. After the processing is done
, theresult is finally displayed on theoutput device. The devices
which putsthe result of the input given by theuser after the
processing is done iscalled as output device. It is also adevice
which communicates the result ofdata processing. Some output
devicesare: Monitor Printer Speaker 3 11. Storage devices are use
to holdinformation. Different storage devices are:1. Hard disc
drive: the place where thefiles are permanently stored.
Theoperating system is installed here.2. CD-ROM drive: these are
use to storelarge amount of data.3 12. 3.Floppy drive: it is a
small discstorage device which has 1.4megabytes of capacity4. DVD
drives: it stores a large amountofdata, which is much more than
thecapacity of CD.5. Memory stick/ pen drives: they aresmall in
size but can hold a good3 13. 3
