Chapter # 15 ( Keyoard Part-2 )

AT Keyboard 84 Keys

84 keys Keyboard was introduced in 1984 by IBM. There were 84 buttons in this keyboard and many problems of previous computers and keyboards were solved with it. In this Keyboard, the button of "ENTER" was replaced with a large space.

Position and sizes of "Shift" buttons were also changes. IBM introduced LEP wires for Scroll Lock and Caps Lock buttons in it. IBM's 84 Keyboard's distinctive competency was that, its processor was placed in Keyboard itself. These two processors could easily communicate & exchange data with each other. Mother Board's processor 8042 Keyboard can also called as "Controller Chip" This chip can send data and guild lines to Keyboard through which functions of Keyboard can be changed. This controller also possess qualities of Scan Contraction which can transfer different foreign languages to its Keyboard.

Actually scan transactions are some electronic lights which travels from mother board to keyboard. For correction of these electro lights functions, LED symbols were included in that Keyboard. Although 84 buttons Keyboard was a good keyboard of that time but, was still facing some criticism on the size and sequence of buttons.

Chapter # 14 ( Keyoard Part-1 )

Keyboard is an input device. Today with the advancement in information technology mouse is used to start a computer and Joystick & Peddles are also being used with mouse. keyboard plays a central role in all of above because, it is a basic input device. With the help of keyboard, we can feed command and data to computer system and computer will show the result.

Now a days, different types of keyboards are available in the market. A leading company IBM introduced different types of computers and keyboards which  were very popular due to their micro efficiencies. In 1995, an other well known company Microsoft Intel Corporation introduced Microsoft Windows system for computers. Intel company also introduced a Keyboard of 101 buttons with Windows 1995.

Commonly, there are 4 types of different Keyboards are available which are as follows;

1. 83 PC XT Keyboard
2. AT Keyboard 84 Keys
3. Keyboard 101/102 Keys
4. Keyboard 104 Keys

Now, lets discuss above types briefly here;


1. 83 PC XT Keyboard:
83 PC XT Keyboard was introduced as a complete computer. It contains same things as compared to other companies computers but, this keyboard was physically separate from computer itself.while, other companies keyboards were attacked with computers like Apple2 Keyboard etc. Although a separate Keyboard was a fantastic part but, it was highly criticized due to sequence of its buttons. There were very little buttons of "shift" and were placed at wrong side on the right.


83 PC XT keyboard was introduced just like a typewriter. It was connected to mother board with the help of processor. It was a "One Way Keyboard" because, mother boards was unable to return command or data. Hence, some wires were attached with it due because "Num Lock" & "Caps Lock" were attached with comp mother board. During passage of time, some more wires were also included in these keyboard.

Three functions of 83 Keyboard were connected with motherboards but it was still not a complete keyboard according to scientist in that times. These faults of 83 Keyboard were replaced and innovated with Repointing or Rearranging.