Sunday, July 16, 2017

ALPHA BETS

  1. ALPHA BETS: - Both lower case (small letters) and upper case (capital letters)
  2. DIGIT NUMBERS: - The digit form 0 to 9
  3. Symbols or special characters the other printable characters such as +, _, $, @, <, >,*, # etc.
FIELD:  it is a group of characters which conveys a specific meaning to observe.
Ex: -Account No, Name, Father Name, DOB Address, etc.,
RECORD: - a Record is group of the entire fix fields for an object of data processing
FILE:- A collection of all the records at one place is called a file
Ex: - Records of all the student of NCTC (or)
         Records of all the students of Urdu Academy A.P.

Short notes on VIRUS:

            Virus means Vital Information Resources Under Sieze. It is a program that takes the operation of a computer under its control.

Viruses are 3 types. 1) BOOT SECTOR VIRUS 2) FILE VIRUS 3) STEALTH VIRUS

1)      Boot Sector Virus enters into system when the system is booted with an infected booting floppy. It resides on boot sector.
2)      Fill Virus may exist through . EXE or .COM files
3)      Stealth Virus is dangerous and difficult to identify. It reduces the file size and unexpected information on the screen.

ABBREVIATIONS (ACRONYMS)

COMPUTER :  Commonly Operating Machine for Particularly Used in Trade and
                            Educational Research        (Or)
COMPUTER :  Commonly Operated Machine Programs Used for Technical and
                            Education Research.
ASCII             :  American Standard Code for Information Interchange.
SRAM                        :  Static Random Access Memory.
DRAM           :  Dynamic Random Access Memory.
SDRAM         :  Static Dynamic Random Access Memory.
BIOS               :  Basic Input Output System.
CRT                :  Cathode Ray Tube.
CAD                :  Computer Aided Design.
WORM          :  Write Once Read Many.
PROM            :   Program Read Only Memory.
EEROM         :  Electrical Erasable Read Only Memory.
EPROM         :  Electrical Programmable Read Only Memory.
EEPROM       :  Electrical Erasable Programmable Read Only Memory.
FIFO               :  First In First Out.
GIGO              :  Garbage in Garbage Out.
MIPS              :  Millions of Instruction per Second.
RPM               :  Rotations per Minute.
LLL                 :  Low Level Language.
HLL                :  High Level Language.
LSI                  :  Large Scale Integrated.
VLSI               :  Very Large Scale Integrated.
MICR             :  Magnetic Ink Character Reader.
OCR               :  Optical Character Reader.
OMR              :  Optical Mark Reader.
LAN                :  Local Area Network.
WAN               :  Wide Area Network.
BIT                 :  Binary Digit
VDU                :  Visual Display Unit
VDT                :  Visual Display Terminal
MGA              :  Monochrome Graphics Adopter.
VGA                :  Video Graphics Array.
CGA                :  Color Graphic Adopter.
EGA                :  Enhanced Graphics Adopter.
HGA               :  Hercules Graphic Adopter.
BSD                :  Backing Storage Device.
BSU                :  Backing Storage Unit.
DISK              :  (Noun) Flat Circular Computer Storage Device.
DISC               :  (Noun) Flat Thinnish Circular Object.

EDSAC           :  Electronic Delay Storage Automatic Computer

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