This is still a problem as of 2010/10/20 and BIOS rev. MOPNV10J.86A.0311.2010.0802.2346.
The BIOS incorrectly reports the parallel port as "PCSPP" irrespective of the selection made in system setup (ECP, EPP, bi-directional,...). Some recent tests done in the CNC / EMC2 machine control community suggest the port is actually being set properly but is not being reported properly. The work-around is not pretty.
These integrated Atom motherboards look very attractive to CNC integrators but for many applications they require fully functional parallel ports. Word is getting around that the D510MO does not work and this may poison the well for future Intel MB usage. There are, after all, alternatives from ASUS, Jetway, etc.
I had a similar problem on my D425KT board. The BIOS would not switch the parallel port to bidirectional. I finally got it to work in bidirectional mode by setting bit 5 in the ECP control register at the base port address + &h402. The software application was written in VB6 under WindowsXP SP3 and used the Inpout32.dll to communicate with the port at address 378.