Class note

feastcanadianΛογισμικό & κατασκευή λογ/κού

14 Δεκ 2013 (πριν από 3 χρόνια και 7 μήνες)

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1.

Write short note;


a.

Operating system

: An operating system(OS) is the software that controls the
allocation and use of a computer’s hardware. Operating system functions range
from simple to complex. Microsoft window, UNIX,LINUX

b.

There is three part of
Operating system

i.

User Interface:

the operating system’s user interface is what user see on
screen and interact with when giving a computer instruction and commands.

ii.

The kernel:

the operating system’s core is its kernel. The kernel’s job is to
regulate disk

files, memory management, program objectives and tasks, and
program execution and processes.

c.

The File Management Systems
:

The File Management System is the operating
system’s organizer, arranging files in a hierarchical tree
-
like structure called the root

directory. Files are collections of data with single, logical names.

d.

Microsoft Window
.

:
Microsoft window is one of the famous operation system now
days.This operation system is made by Microsoft company .It is very user friendly
using GUI.Windows 95,

Win
dows98,

Windows2000,

WindowsXP,

Windows7 and
Windows 8
.

e.

other two major operating system with short description

.

i.

(1)
UNIX

:
Unix

(officially trademarked as

UNIX) is a

multitasking
,

multi
-
user

computer

operating system

originally developed in 1969 by a group
of

AT&T

employees at

Bell Labs
. First developed in

assembly language
, by
1973 it had been almost entirely recoded in
C
, greatly facilitating its f
urther
development and

porting

to other hardware.

ii.

LINUX
: LINUX
is a

Unix
-
like

computer

operating system

assembled under
the model of

free and open source s
oftware

development and distribution.
The defining component of Linux is the

Linux kernel
.

f.

Computer :

A

computer

is a general purpose device that can be

programmed

to
carry out a set of arithmetic or logical operations. Since a sequence of operations can
be readily changed, the computer can solve more than one kind of problem
.
.

g.

Microprocessor

:
A

microprocessor

incorporates the functions of
a

computer
's

central
processing unit

(CPU) on a single

integrated circuit

(IC),
[1]

or at
most a few in
tegrated circuits.
[2]

It is a multipurpose,

programmable

device that
accepts

digital data

as input, processes it according to instructions stored in its
memory, and provides results as output. It is an example of

sequential digital logic
,
as it has internal memory. Microprocessors operate on numbers and symbols
represented in the

binary numeral system
.
.

h.

Input

:
In

computing
, an

input device

is any

peripheral

(piece of

computer
hardware

equipment) used to provide data and control signals to an
information
processing system

such as a

computer

or other

information appliance
.
Examples of
input devices include

keyboards
,
mouse
,

scanners
,

digital cameras

and

jo
ysticks
.

i.

Processor
:
A

central processing unit

(
CPU
), also referred to as a

central processor
unit
,
[1]

is the hardware within a

computer

that carries out the

instructions

of
a

computer program

by performing the basic arithmetical, logical,
and

input/output

operations of the system.
.

j.

Data
:
Data
are th
e

quantities
, characters, or symbols on which operations are
performed by a

computer
, being stored and transmitted
in the form of electrical
signals and recorded on magnetic, optical, or mechanical recording media
.

k.

different types of computer. Explain:

i.

A

microcomputer

is a small, relatively inexpensive

computer

with
a
microprocessor

as its

central processing unit

(CPU).
[2]

It includes a
microprocessor, memory, and input/output (I/O) facilities.

ii.

Mainframe computers


are

computers
used

primarily by corporate and
governmental organizations for critical applications, bulk data processing
such as

census
, industry and consumer statistics,

enterprise resource
planning

and

transaction processing
.

iii.

A

minicomputer
, or colloquially

mini
, is a class of smaller

computers

that
evolved in the mid
-
1960s and sold for much less than

main
frame

and mid
-
size computers from

IBM

and its direct competitors.

iv.

A

supercomputer

is a

computer

at the frontline of contemporary processing
capacity
--
particularly speed of calculation. Supercomputers were introduced
in the 1960s

2.

Block diagram of computer

a.




input

Processing

Communications

output

Storage

b.



3.

Draw the block diagram of
Computer.

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