DOS Fn 01H: Keyboard Input

                                                         Compatibility: 1.0+ 
 Expects: AH    01H
 Returns: AL    character fetched from the Standard Input
    Info: Reads (waits for) a character from the Standard Input Device.
          Echoes that character to the Standard Output Device.  If
          Ctrl-Break is detected, INT 23H is executed.

   Notes: ■ Extended ASCII keystrokes (i.e., F1-F12, PgUp, cursor, etc)
            will require two calls to this function.  The first call will
            return AL=0.  The second will return AL with the extended ASCII

See Also: Character I/O Functions
          DOS Functions