Int 17 Fn 01  - Printer - Initialize Port                                  [B]

   AH = 01h
   DX = printer number (00h-02h)

Return: AH = printer status (see AH=00h)

Note:  some printers report that they are ready immediately after
     initialization when they actually are not; a more reliable result may
     be obtained by calling AH=02h after a brief delay

See Also: AH=02h,AH=FFh"PC-MOS",INT 1A/AH=10h"NEC"