INT 14h,  13h    Single character ANSI write to screen.

      Entry:  AL         Character to display

      Exit:   None

    The character in AL is sent to the screen by the fastest method possible
    that allows ANSI processing to occur (if available). This routine should
    not be used in such a way that DOS output  (which is not re-entrant) can
    not be employed by some FOSSIL driver to perform the function  (in fact,
    on the IBM PC that is likely to be how it's done).  On some systems such
    as the DEC Rainbow this will be a very fast method of screen writing.