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They are 2 winding type, that's not in question.
There are 6 connections because unipolar drives need
windings with a center-tap. You would ignore the center tap
when using a bipolar drive (series connection).

Note that when using this series connection you would
lower the drive current (so say 4 A instead of 8A)



 

That's an odd error as a parallel port in mode "out" should have pin 16

Can you comment out any line that causes an error, launch LinuxCNC
and then in a terminal type:

halcmd show pin parport

and show the results here