Int 17h, 01h            Initialize Printer

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

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

        Return  AH = Printer status (See service 02h)

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