![]() Applications reading keystrokes from the BIOS would behave according to what action they associate with that code. It would place the corresponding code into the keyboard buffer so that it would look (almost) as if the code had been entered by a single keystroke. On IBM-compatible personal computers the BIOS allowed the user to hold down the Alt key and type a decimal number on the keypad. Many Wikipedia articles on various characters will include how to type that character using Alt codes for code page 437. Often this is the best or only method many computer users know for entering non-ASCII characters. ![]() Similar or extended forms of this feature are also available in some other operating systems. This is done by pressing and holding the Alt key while typing a number that identifies the character, using the keyboard's numeric keypad. On personal computers using Microsoft operating systems, characters that do not have a dedicated key may nevertheless be entered using the Alt Numpad input method or Alt code.
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