Compuetr System

When learning about a computer system, we learn about all the components that are used when using computers.
For learning purpose we classify computer system into four categories

• Hardware : Physical components of the computer
• 
• Software: the instructions that use to control the computer 
• 
• Liveware : the people who are working with the computer
• 
• Firmware : manufactured permanent instruction set of the computer
• 

Hardware
Named as hardware because in hardware we discuss about tangible(Physical devices ,machinery equipments) of the computer.
in here we categorize hardware again into four main categories.

• Input Hardware
• Output Hardware
• Processing Hardware
• Storage Hardware

Input Hardware
the hardware devices that use to input data into the computer can explain as input hardware
We can categorize them again under the type of input they get

• Character input device -Keyboard,micr

vb  key board uses a cursor to locate the next carater in the screen and when pressing the key it prints the key at the next cursor location . some keys are uses for control instructions.To learn about Keyboard go to keyboard guide.

• Pointing Device-Mouse

Mouse uses to show select any place of the screen. it uses a pointer at the screen to show current position. the pointer moves according to the movements when user moves the mouse.
trackball
Track stick
Touch pad
light pen

• Graphic input devices

scanner
Digital camera

• Voice input devices

microphone

• video input devices

web camera

• card readers

magmatic strip card reader

• code reader

Bar code reader

• Mark reader

OMR

• motion sensors

Data glow

• biometrics

finger print reader
Output devices
the devices that use to output Indicate something to user can explain as output devices.they also categorize under many reasons mainly we can categorize under tow categorizations.

• soft copy output devices
• Hard copy output devices

soft copy output devices
this out put devices gives non tangible out put to the user . because we name as soft copy output device

• monitor(screen,Visual Display unit)
• Speakers(sound)

Monitor
it users mostly power supply from outside of the system unit it need power supply and video signal cable . by the technology we can categorize the monitors.

• CRT
• LCD
• plasma
• LED
• SED

projector
Sound

• sound blasters
• Sub woofers

Hard copy output devices

• printer

impact

• drum
• daisy wheel
• ribbon
• dot matrix

non impact

• inkjet
• laser jet
• thermal

plotter