Yes, it should not be, but MAY be.
The lp.h contains the incorrect line yet:
#define LP_PINTEN 0x10 /* high to read data in or-ed with data out */
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^???
(At least in 2.2.7)
And IMHO if there is one duplicated symbol there may be two also.
Gabor
----
Ooops! I've just understood, that this comment is totally bad even for
the 0x20 bit. If bit 0x20 is 0 the input and output will be AND-ed.
Otherwise the output drives does high-impedance state and does not
interfere with the input.
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