Microcomputer keyboard of the IBM in the first generation, about the year AD 1981 has all the buttons 83 button, which is called the keyboard. PC / XT and in 1975. 1984. Increase the up button is a button 84 called keyboard PC / AT per class, developed gradually. According to the needs of users, called a keyboard AT and developed a version of the keyboard PS / 2 rises again 17 button combine and 101 button.
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