INT 17H: Printer Support

 These functions provide access to the parallel printer ports (LPT1, etc.)

 The printer port addresses are stored starting at 0040:0008.  Printer
 time-out intervals start at 0040:0078.  See BIOS Data Area.

          AH  BIOS Service
          ▀▀▀ ▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀
          00H print a character
          01H setup printer port
          02H query printer status

    Note: The BIOS offers no support for bidirectional parallel
          communications (though standard PC hardware has supported it
          since about 1987).

See Also: Parallel Printer Adapter Ports
          INT 05H (print screen)
          Printer Functions (DOS fns)
          BIOS Data Area
          ROM-BIOS Functions
          Cables and Pin Outs