Monday, August 24, 2009

Computer System

Each computer consist of a series of devices that together operate as an integrated unit or computer system.

Here are the types of functional units:
  1. Central processing unit
  2. Input unit
  3. Output unit
  4. Auxiliary or secondary storage unit
The processor is made up of the memory, arithmetic, logic and control units. A larger computer system will normally have one or more auxiliary units, where input and output data are stored.

Friday, August 21, 2009

Why Computers Sometimes Fail

Why Computers Sometimes Fail

Now a days we've seen a rapid expansion of computers that mostly all people used computers for creating businesses, governments and private schools but now a days public schools they already starting to know what is computer and how it works.

But sometimes computers fails to meet its objectives of increased speed, accuracy, and meaningful information.

There are some common errors:
  1. Input Errors: when data is entered into a computer it must be relatively error-free it is to be processed correctively.
  2. Errors in Instructing a Computer: Computers operate on data using a set of instructions prepared by a programmer which are used to read data, process it, and produce output. Some programs contains errors and they called it "bugs" that do not become evident until a specific set of circumstances arises.
  3. The Communication Gap: One main reason why computerized procedures frequently fail to meet their required objectives is because computer professionals and the people who will actually utilized the information, called "users" do not understand each others needs or have not communicated successfully. Users do not really understand what computers can and can't do and some other professional did not understand how best computer is.
  4. Improper Controls: The need of computers increase rapidly and need proper control and security measures, the need of such control and security is even greater but most organizations neglected this area.
  5. Lack of Standards: Lack of standards results in problems when an organization obtains new equipment, hires new computer professionals and attempts to provide some consistent set of procedures.
  6. Lack of Adequate Manufacturer Support: