ICT is the foundation of economy and a driving
force of social changes in the 21st century.
Distance is no longer an issue when it comes to accessing information

Information is collected & given to computer for processing

Computer process information to the required data

Information is given to the user as input

information is stored in the computer for further use

Programs are stored in the Computer processor

there are various views of computer systems
 User’s view
 Programmer’s view  Architect’s view  Implementer’s view

there are several types of computers like
• Embedded computers
• Personal computers • Servers and Enterprise systems • Supercomputers and Grid computers • “Cloud” computing

... View of Computer System sees it as
Application software
System software System Hardware

used for running larger programs for multiple
users or programs that require continuous online access.
They are typically accessed only via a network

A class of computers with the highest
performance and cost. They are configured as servers and
typically cost millions of dollars

designed for use by an
individual, usually incorporating a graphics display,
keyboard, and mouse

are inside another device used for
running one predetermined application or collection of
software. Examples: cell phones, video games, digital TVs, PDAs, etc.

increasing level of abstraction

assembly languages are

Depends on the type and level of language used

High-level languages/application programs are

Assembly language is human readable

Assembly language is native to a processor

Assembly language is One-to-one correspondence with most machine
language instructions