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It consists of flags which may be bitwise-ored together: ============================= =============================================== PARPORT_MODE_PCSPP IBM PC registers are available, - i.e. functions that act on data, - control and status registers are - probably writing directly to the - hardware. + i.e. ``base`` (and ``base_hi`` if ECP) + in ``struct parport`` is valid. + Functions that act on data, control + and status registers are probably + writing directly to the hardware. PARPORT_MODE_TRISTATE The data drivers may be turned off. This allows the data lines to be used for reverse (peripheral to host)