Important Notice

The pages on this site contain documentation for very old MS-DOS software, purely for historical purposes. If you're looking for up-to-date documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.

   ◄Summary►  ◄Notes►  ◄Back►
──────────────────────────────────────────────────────────────────────────────
 
  Description:  Check Input Status
 
  Checks whether a character is available from the standard input device.
  Input can be redirected.
 
  Input             Output
  ══════            ═════════════════════════════════════════════
  AH=0BH            AL=00H if no character is available
                      =FFH if at least one character is available
                                    -♦-