Computer Keyboard

The keyboard has seen various formats including the one that had the letters arranged sequentially and the others most of which were designed in such a manner so as to increase the typing speed and reduce the movement of fingers as far as possible. But the one that has been used prominently and very frequently, the QWERTY keyboard, is the one that has been designed for just the contrary. It has been designed so that the typing speed could be as slow as possible. The reason behind this is that with the increased efficiency of typing the keys of the keyboard used to get stuck when pressed in quick succession. Therefore Sholes, with one of his relatives who was adept at mathematics, derived a keyboard placing the most frequently keys as far apart as possible. Thus reducing the typing speed considerably and removing this problem and the keys getting stuck.
1. Input Devices: – The devices that are connected to the computer to provide input to the computer system are called as input devices. The input may be in the form of either data or control instructions. Input devices are also used so that the user may interact with the application program. The examples of input devices include keyboard, mouse, punch card reader etc.
2. Processing Units: – The devices that are responsible for the processing of data to obtain the intended results are called the processing unit. The CPU is the Central Processing Unit for the computer. It is also commonly called as the processor.
3. Storage Units:- The devices that are responsible for storing the results of the operations and sometimes even the application program and data are called the storage units or memory devices. Examples are Hard disk, Compact Disk, Floppy Disk etc.
4. Output Devices:- The devices responsible for displaying the results of the operation are called as the output devices. Examples include monitor or VDU, printer, punch card reader etc.
Keyboard is the primary input device for a computer.
In rather technical terms, keyboard is associated with the serial ports of a computer and is considered a serial device. The device could have been made to accept data in parallel as well. However, even if the device is made parallel, practically there will be no use of it owing to the limitations of the speed with which a user can type the data.
The input from the keyboard may be in the form of data information like text, numbers, special characters etc. or in the form of special commands (which are also called as interrupts) to the operating system. There are a few keyboards which have extra keys as compared to the conventional 104 keys keyboard and are called as multimedia keyboards. These keyboards have special buttons like a mute button, volume button, button for web browsing etc for the quicker access to these functions. On the others, these functions could be implemented through other routes provided by the operating system alone.
The keyboard is the friendliest input peripheral. It consists of a set of key switches. There is one key switch for each letter, number, symbol etc, much like a typewriter. When a key is pressed, the key switch is activated. The keyboard has an electronic circuit to determine which key has been pressed. Then a standard 8 bit code is generated and sent to the