INT 17h,  01h (1)        Initialize Printer

    Sends initialization control codes to the specified parallel printer
    and returns the current status of the printer.

       On entry:      AH         01h
                      DX         Parallel printer number (0 = LPT1, 1 = LPT2,
                                 etc.)

       Returns:       AH         Printer status (See service 02h)

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       Notes:         This service sends the hex values 08h and 0Ch to the
                      printer's control port, thereby initializing the
                      printer.