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