computers

    Part of a computer's memory is microchip built in at the factory and known as ROM, or Read-Only Memory.ROM comes the basic working instructions.




    RAM (Random-Access Memory) consists of microchips that receive new data and instructions when needed.



    Data can also be stored as magnetic patterns on a removable disk, or on the laser-guided bumps on a CD (Computer Disk) or DVD (Digital Versatile Disk).


 
    At the heart of every computer is a powerful microchip called the Central Processing Unit, or CPU.




   The CPU works things out, within the guidelines set by the computer's ROM. It carries out programes by sending data to the right place in the RAM.




    Computers store information in bits (binary digits), either 0 or 1.




   The bits 0 and 1 are equivalent to the OFF and ON of electric current flow.Eight bits make byte.




   A kilobyte is 1000 bytes; a megabyte(MB) is 1,000,000 bytes; a gigabyte(GB) is 1,000,000,000 bytes; a terabyte(TR) is 1,000,000,000,000 bytes.




   A CD can hold about 600 MB of data-about 375,000 pages of ordinary text.

  

a computer