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  The ROM BIOS printer services support printer output through the parallel
  printer adapter. The three ROM BIOS printer services are invoked with
  interrupt 17H (decimal 23), requested through the AH register, and
  numbered 00H through 02H. (See Figure 12-14.) The general PC-family
  design allows more than one printer to be installed, so a printer number
  must be specified in register DX for all these services.

  Service                  Description
  --------------------------------------------------------------------------
  00H                      Send One Byte to Printer.
  01H                      Initialize Printer.
  02H                      Get Printer Status.
  --------------------------------------------------------------------------

  Figure 12-14.  The three ROM BIOS printer services invoked through
  interrupt 17H (decimal 23).