In computing, a keyboard is a peripheral input or device, partly inspired by the keyboard for typewriters, using a provision of buttons or keys, that act as mechanical levers or electronic switches that send information to the computer. After the punch cards and paper tape, interaction via teletype-style keyboards became the primary means of entry for computers. The keyboard is between 99 and 127 keys approximately, and is divided into four bloque:1. Block functions: going from the F1 key to F12 in three blocks of four: F1 to F4, F5 to F8 and F9 to F12. They function according to the program that is open. For example, in many programs by pressing the F1 key is accessed the help associated with this programa.2. Alphanumeric block: is located at the bottom of the block of functions, it contains the numerals from 1 to 0 and the alphabet organized as on a typewriter, in addition to some especiales.3 keys. Special block: located to the right of the alphanumeric block, it contains some special keys such as printscreen, scroll lock, pause, start, end, insert, remove, PgUp, PgDn, and directional arrows to move the insertion point in the four direcciones.4. Numeric block: located to the right of the special block, activated by pressing the key Num lock, it contains organized numerals on a calculator in order to facilitate the fingering of figures. Also contains signs of the four basic operations: addition, multiplication, subtraction-** and Division /; It also contains a key enter or Enter.
