ICT - 2 - ICTweb
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Transcript ICT - 2 - ICTweb
AS LEVEL ICT – MODULE 2
Revision Slides
Introduction to Computer
Systems
Components of a computer
Input & Output devices
Processor
Memory
Storage
ASCII
Data Capture
Keyboard entry
Voices entry
Key to disk systems
Mouse, joystick, light pen & touch screen
MICR
Smart Cards
Magnetic Stripe
Bar Codes
Validation & Verification
Data Capture
Types of error
Batch processing
Validation checks
Presence Check
Format check
Check Digit
Range check
File lookup check
Verification
Detecting
transmission errors
Accuracy and validity
Introduction to Databases
What is a database
Problems with flat
files
Retrieving information
Redundant data
from a database
Errors on input
Flat files
Problems with
modifying data
Problems with
updating data
Relational Databases
Using multiple tables
Putting data in correct tables
Significance of field types
Primary Key
Tables, Forms, Queries &
Reports
Tables
Forms
Queries
Reports
Selecting a suitable output format
Systems Software
What is an operating system
Functions of an operating system
Utility programs
The DOS operating system
Command-driven interface
Graphical user interface
DOS / Windows / UNIX / LINUX
Categories of Software
Systems software
Applications software
General purpose software
Integrated packages
Generic & specific software
Generic Software
Word Processing
Spreadsheets
Databases
Electronic Mail
Presentation Graphics
Application generators
Report generators
Web browsers
Capabilities of Software
Object linking & embedding
The need for portability of data
Problems with portability
Upgradability
Criteria for selecting a software package
Evaluating software
Software reliability
Modes of Processing
Transactions
Master & transaction files
Batch processing
Interactive processing
Real time & pseudo real time processing
Criteria for choice of processing mode
Processing Different Types
of Data
Representing numbers
Real numbers
Digitised sound
MIDI
Bit-mapped graphics
Vector graphics
Storage Devices
Primary & secondary
sources
File processing
concepts
Floppy & ZIP disks
How data is stored
Hard disks
Magnetic tape
CD ROM
WORM disks
Magneto-optical disks
Microfiche
Security of Data
Issues of privacy
Threats of
information systems
Data Integrity
Standard clerical
procedures
Write-protecting disks
User ID’s &
passwords
Access rights
Securing against
fraudulent use
Protection against
viruses
Biometrics
Communications
security
Disaster Planning
Backup
Periodic backup
Backup strategies
Backup hardware
Backing up on line databases
Factors in a backup strategy
Recovery procedures
Output Devices
Printers
Dot Matrix
Ink jet
Laser
Plotters
VDU
Communicating with
the CPU
Parallel & serial
transmission
Buffering
Spooling
Installing hardware
devices
Network Environments
Advantages &
disadvantages of
LANs
Server vs. Peer to
peer networks
Wide Area Networks
Communications links
Communications
media
ISDN lines
Bridges & gateways
Modems
Synchronous and
asynchronous
transmission
Protocol
Factors affecting
transmission speed
User Interfaces
Importance of good
interface design
Designing usable
systems
Interface styles
Command line
interface Menus
Natural Language
Forms & dialogue
boxes
WIMP interface
Advantaged of a
command user
interface
Speech input
Speech / sound
output