This document discusses input and output devices used in computer systems. It describes commonly used input devices like keyboards, mice, scanners, and microphones. It also covers popular output devices such as monitors, printers, and speakers. The document also provides an overview of primary memory technologies like RAM and ROM. Secondary storage devices for long-term storage are examined, including hard drives, USB drives, optical discs, and tape drives.

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2. INDEX
FLOW CHART
INPUT & OUTPUT DEVICES
ROLE OF IO DEVICES
COMMONLY USED INPUT
DEVICES
COMMONLY USED OUTPUT
DEVICES
MEMORY
SECONDARY MEMORY
SECONDARY STORAGE DEVICES
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3. FLOW CHART
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4. PROVIDE MEANS OF COMMUNICATION BETWEEN A
COMPUTER AND OUTER WORLD.
ALSO KNOWN AS PERIPHERAL DEVICES BECAUSE THEY
SURROUND CPU AND MEMORY OF A COMPUTER SYSTEM.
IO DEVICES ARE USED TO ENTER DATA FROM
OUTSIDEWORLD INTO PRIMARY STORAGE .
OUTPUT DEVICES SUPPLY RESULTS OF PROCESSING
FROM PRIMARY STORAGE TO USERS.
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5. ROLE OF IO DEVICES
INPUT DATA FROM
EXTERNAL WORLD
INPUT DEVICES
CPU&MEMORY
OUTPUT DEVICES
RESULTS OF PROCESSING IN
HUMAN ACCESSIBLE FORM
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6. COMMONLY USED INPUT DEVICES
INPUT
DEVICES
KEYBOARD
POINT &
DRAW
DEVICES
SPEECH
RECOGNITI
ON DEVICES
VISUAL
BASED
DEVICES
DATA
SCANNER
DIGITIZER
ELECTRONIC
CARD
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7. KEYBOARD
THE KEYS OF KEYBOARD ARE
DIVIDED AS:-
Alphanumeric keys
Function keys
Numeric key pad
Cursor movement keys
Special purpose keys
Modifier keys
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8. POINT AND DRAW DEVICES
CONTAINS:-
 MOUSE
 TRACKBALL
 JOYSTICK
 LIGHT PEN
 TOUCH SCREEN
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9.  DIGITIZER:-a digitizer is a
device which convert analog
information into a digital form.
 SPEECH RECOGNITION
DEVICES:-it consists
components that convert the
human spoken words into
computer text and commands.
 SCANNER:-it is an input device
which uses paper document as
an input.
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10. COMMONLY OUTPUT DEVICES
OUTPUT
DEVICES
MONITOR
PRINTER
PLOTTER
VOICE RESPONSE SYSTEM
SCREEN IMAGE PROJECTOR
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11. MONITOR
IT IS ALSO CALLED VISUAL
DISPLAY UNIT
USE TO DISPLAY THE INPUT DATA.
IT CAN BE COLOR OR
MONOCHROME.
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12. PRINTER
It is an output device, which can
be used to get a printed hard
copy of the processed text or
results on paper
Depending on their speed and
approach of printing, printers
are classified as:_
Impact printers
Non-impact printers
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13. PLOTTER:
A plotter is a printer that interprets
commands from a computer to make
line drawings on paper which one or
more automated pens.
It is of two types:-
o Drum plotter
o Flatbed plotter
SCREEN IMAGE PROJECTORS:
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14. MEMORY
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15. RAM:RANDOM ACCESS MEMORY
Primary storage of
computer is also referred
to as RAM because of
random access capability
Are volatile memory
Types of ram:_
 Sram
 Dram
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16. ROM:READ ONLY MEMORY
 Non-volatile memory chip
 Data stored in a ROM can
only be read and used—
they cant be changed
 Types of rom:
Prom
Eeprom
Eprom
Flash rom
Masked rom
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17. CACHE MEMORY
o It is commonly used for
running the memory
processer ,speed mismatch
o It is an extremely fast, small
memory between cpu and
main memory
o It is used to store vary active
data and instructions
during processing
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18. SECONDARY STORAGE DEVICES
 HARDDISK
 FLOPPYDISK
 PENDRIVE
 CD & DVDS
 MEMORY CARD
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19. SECONDARY MEMORY
 MAGNETIC TAPE
 MAGNETIC DISK
 OPTICAL DISK
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