Tuesday, 27 March 2012

(Lecture 35) Word Processor

Word Processor is software that helps you to create any type of written communication like a letter, a report, a memo, or any other type of correspondence or text data. (i.e. Microsoft Word, Word Pad, Word Star and Word Perfect are the common word processor).  But the Microsoft Word is popular word processor.

Wednesday, 21 March 2012

(Lecture 34) Flatbed Scanner

A flatbed scanner is made up of a glass pane and a moving optical C_IS or C_CD array.  The pane is illuminated with the help of bright light planted underneath it.  The image which is to be scanned is then placed on the glass pane.   The sensor and the source of light move across the glass pane to scan the document and produce its digital copy.

Tuesday, 20 March 2012

(Lecture 33) System Software

System software consists of the programs that control or maintains the operations of the computer and ts devices.  System software serves as the interface between user, computer and application software.

Sunday, 9 October 2011

(Lecture 32) Arithmetic Logic Unit (A-LU)

The Arithmetic and Logic Unit (A-LU) another component of the processor performs arithmetic, comparison, and logical operation.  Arithmetic operations include basic calculation such as addition, subtraction, multiplication and division.  Logical operation include conditions along with logical operator such as AND, OR, and NOT.  For example, if only employees paid hourly can receive overtime pay, the A-LU must verify to condition before computing an overtime wage.

  1. The employee is paid hourly AND
  2. The employee worked more than 40 hours

(Lecture 31) Control Unit (CU)

The control unit is the component of the processor that directs a coordinates most of operations in the computer.  The control unit has a rule much like a traffic cops:  It interprets each instruction issued by a program and then initiates the appropriate action to carry out the instructions.

(Lecture 30) Central Processing Unit (CPU)

The Microprocessor, also called the central processing unit, interprets and carries out all the basic instructions that operate the computer.  Processor contains a Control Unit (CU) and an Arithmetic and Logic Unit (A-LU).  These two components work together to perform processing of operations.

(Lecture 29) Output Devices

Computer hardware components that are used to receive processed information from computer are called output devices.

  1. CRT (Cathode Ray Tube) Monitors and LCD (Liquid Crystal Display) Flat Panel Display
  2. Speakers
  3. Printers (Impact Printers Dot Matrix Printer (Non-Impact Printers Ink Jet printer
  4. Plotters
  5. Projector