Octal

  By default, Calculator appears in decimal mode when you
  start the Calculator.

  To change to Octal mode, choose the Octal menu item from
  the Mode menu.  The Calculator appears in Octal mode.

  Additional topics:

  *   Mode Menu

  *   Edit Menu

  *   File Menu

  *   Overview of Calculator

  *   Octal Keypad and Special Function Bindings