Overview of Computer System

Computer hardware

Computer software

Introduction to computers

Computing devices

Computer hardware and software

Basic operation of a computer

Classification of digital computers

Mainframe computer

Minicomputer

Micro computer ex:ibm thinkpad

Input operation

Output operation

Processing operation

Storage operation

Hardware

Software

Ex:dec pdp, vax series

Ibm's zEnterprize ec12

Atm machine,digital alarm clock,cell phones

System software

Operating system,device drivers, utility software, language processors

Application software

Productivity software,business software,entertainment software, educational software

Internet application

Super computer

Web applications, cloud computing applications,social media network applications

Licensed software, open source software,shareware,freeware

input devices

pointing devices

mouse, trackball, joystick, touchscreen, light pen, touch pad

keyboard,microphone,digital camera,

scanners: hand-held scanner, flatbed scanner,barcode reader

touchscreen:capacitive,resistive

cathode ray tubes,liquid crystal display,light emmiting diodes

monitor

printers

plotters

flatbedploter,drumplotter

impact printers,non impact printers

automatic data capturing devices

magnetic card reader,magnetic ink character reader,optical character reader,barcode reader,optical mark reader,quick responce code reader

open source code: it is computer software that is available in the form of source code

shareware:it is given to people free of charge for a limited time period

licensed software: legal agreement,when a person purchased the software he is allowed to use the software

specialised computers

accepting data

write data to storage device hard disk

performing operations

sending results

all the physical components of computer

a set of instructions, data or programs used to operate computers and execute specific tasks.

impact printers: dot matrix and chain printer

non impact printers: inkjet and laser printer

freeware:it is available for use free of cost

business software:it is used to run business activities

productivity software:it is used to improve the way people do their work

entertainment software:it is used to entertain people

educational software:it is used for learning purpose

magnetic ink character reader: it is used to verify the legitimacy or originality of paper documents, especially checks.

magnetic card reader:it is used to read the information stored within the magnetic stripe of special cards such as credit cards and ATM cards.

optical character reader:converting printed paper documents into machine-readable text documents

barcode reader:it is used to capture and read information contained in a bar code .

optical mark reader:it reads the mark of pencils made on predefined positions on the OMR sheets

quick responce code reader:it is used to provide easy access to online information through the digital camera on a smartphone or tablet