Int 21 Fn 05  - DOS 1+ - Write Character To Printer                        [D]

   AH = 05h
   DL = character to print

Notes: keyboard checked for  Break, and INT 23 executed if detected
   STDPRN is usually the first parallel port, but may be redirected under
     DOS 2+
   if the printer is busy, this function will wait

See Also: INT 17/AH=00h