Hardware

Hardware- V D U (visual display unit)
System Unit(C.P.U.=Central Processing Unit)
The Hard Disk Drive
The Floppy Disk Drive
Mouse
The Printer
Keyboard



V.D.U. The unit that resembles a TV screen is called the V.D.U. or monitor.The information displayed by the V.D.U. Hence the V.D.U. is an output device. V.D.U. can be of various types:

1. Monochrome V.D.U. displays single colour(green,white or umber)
2. Colour V.D.U. displays 16 colours
3. Low Resolution V.D.U. displays poor quality of graphic
4. High resolution V.D.U. displays superior quality of graphic

System Unit (C.P.U.):- is really a computer itself.It performs all operations,calculations and processes. That is why it is called as central processing unit.Inside its are electronic components.Actual processing is the Micro processor Chips. Another component of the system unit is Internal Storage.

The System Unit contains the memory of the PC. Besides the Micro Processor the System Unit is also contains storage area where the data store before being actually processed. This area is called Internal storage.
For permanent storage of data, external storage media can be used with a PC system.There are two kinds of external storage media commonly used in PCs are
1. Hard Disk Drive 2. Floppy Disk Drive

1. Hard Disk Drive:- The System Unit (C.P.U.)contains PCs hard disk drive,also known as a fixed disk drive.The hard disk drive consists of a hard disk, a mechanism that spines the disk. a head that reads information and writes information to the hard disk. The hard disk spines within the drive.The head reads information from it and records information onto it. Hard disk contains the operating system program, that tell your PC how to work. Also it stores program and information file on the hard disk.
2. Floppy Disk Drive:-A floppy disk drive transfers information to and from your hard disk or directly into memory. Floppy Disk Drive reads and record information on floppy disk.They are slower and store much less information than your hard disk. E.g. Software manufacturerdistributes programs on Floppy Disk Drive.When we copy the program from floppy disk to hard disk, floppy disk are the good way to transfer information from your PC to another PC or to store copies of information on your hard disk. If we have aard disk and a floppy disk, then the Floppy Disk Drive is called A:,and the Hard Disk Drive is called C:.
   

The Keyboard:-Components that closely resembles with a typewriter is called the Keyboard. It commutes with PC by typing instructions and pressing keys on the keyboard. There are several types of keyboards such as IBM PC Keyboard and IBM PC/XT,IBM PC/AT.