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8 Νοε 2013 (πριν από 3 χρόνια και 9 μήνες)

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Module 0 resources

Presented by:

Oscar
Abagali

Nkrumah Duncan Williams

Gerard
Ataogye

Anthony
Sarpong

On 14/03/2013


Module activity unit 1:

computer ;networks

What is a computer?


A
computer

is a general
purpose device that can
be programmed to carry
out a finite set of
arithmetic or logical
operations.


WHAT ARE THE DIFFERENT TYPES OF
COMPUTER?


THE TYPES DEPEND ON:


1. Configuration/classes:


the size and structure


2. Operation: the electrical /
electronic signal that is used
to operation.


1. Configuration: the size and structure


2. Operation principle: signal used
:

Analogue :
set of varying voltages

Digital :
uses set of 0 and 1 or off state and on state

Hybrid:
use both forms of signals

http://home.olemiss.edu/~misbook/ss14.htm


Microcomputers /
personal computers:
.

Popular uses for microcomputers include
word processing, surfing the Web,
sending and receiving e
-
mail, spreadsheet
calculations, database management,
editing photographs, creating graphics,
and playing music or games. desktop
computers ,notebook computers, laptops,
iPads, iPods, palmtop, programmable
calculators, mobile phones, Tablet
Computers and Smartphones , PDAs and
Palmtop Computers




A
minicomputer

is a multi
-
user
computer that is less powerful than
a mainframe.

A
mainframe

computer is a
large, powerful computer that
handles the processing for many
users simultaneously (up to
several hundred users).

A
supercomputer

is mainframe
computer that has been
optimized for speed and
processing power.

Supercomputer (this one is a Cray
-
2 from the 1980’s)


Hardware


Computer hardware
is the collection of
physical components that make up a
computer, for example, a screen, a
cpu
,
laptop, mouse, keyboard, mother board,
memory chip as RAM, ROM, ports, circuit
boards, power supplies, and cooling fans,
video monitor, camera, or printer etc



Input devices
:


These devices allow
users to interact with
the applications that
the computer displays:


Mouse

Scanner

CD/DVD Device

Writing Tablet And
Stylus

Touchscreen

Web Camera

SD Card

Joystick

Microphone

Bar Code Scanner

An output device

Is any peripheral device that
converts machine
-
readable
information into people
-
readable
form such as a monitor, printer,
plotter and voice output device.

Monitors

Printers

Plotters

Voice Output
Devices

Modems

Software; What is it?


Software

is a generic term for organized collections of
computer data and instructions

System software


is responsible for controlling, integrating, and managing the
individual hardware components of a computer system so
that other software and the users of the system see it as a
functional unit. Example window XP, windows 7, Linux, Mac
osx
, Unix etc.

It consist of



System Management Programs:
operating system,
communications software and database manage.




System Development Programs



System Support Programs



Features of System Software


Disk formatters, file managers, display managers,
text editors, memory management


Interface for user communication


User authentication (login) and management
tools,


Networking and device control software.


System utility programs, system performance
monitor programs, and system security monitor
programs


Application software


May consist of a single program used to accomplish
specific tasks,
e.g

a spreadsheet or text processing


Main type:


General
-
Purpose Application Programs


Application
-
Specific Software


Examples
:


Word Processing Package,


spreadsheet Packages,


Database Management Packages ,


Graphics Packages ,


Communications Packages ,


Integrated Packages etc

Summary of the computer software
-

user relation

Soft ware License;
W
hy?


The software's license
gives the user the right to
use
the software in the licensed environment.


Protect the patency of software


Some software comes with the license when purchased off
the shelf, or an OEM
-

original equipment manufacturer
-

license when bundled with hardware.


Free software license
, granting the recipient the rights to
modify and redistribute the software.


Freeware
/ trial version or
shareware

for a period of time say
30 days .