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Chapter 17. Understanding ANSI.SYS > Customizing Your Keyboard with ANSI.SYS

Customizing Your Keyboard with ANSI.SYS

Computers use a set of 256 codes to indicate specific characters. These codes make up the ASCII character set. (ASCII is an acronym for the American Standard Code for Information Interchange.) A space, for example, is ASCII code 48; the uppercase A is ASCII code 65; and the lowercase a is ASCII code 97. You already know that the Escape code used in an ANSI control sequence has an ASCII value of 27. (See Appendix E,“ASCII and Extended ASCII Codes,” for a list of ASCII codes.)

Every time you press a key on your keyboard, the system's circuits send a code to DOS. This code interprets the keystroke and displays the appropriate character. Not every code in the ASCII set, however, has a corresponding keyboard key. Moreover, some keys represent more than one character.


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