This standard provides a performance-oriented keyboard arrangement that is an alternative to the keyboard presented in American National Standard for office machines and supplies - Alphanumeric machines - Keyboard arrangement, ANSI X3.154. This standard describes the arrangement of the 48 basic printing keys on the keyboard and the characters, uppercase and lowercase, that appear on the keys. The character assignments are divided into five application areas, in recognition of the different graphic character requirements of these application areas.