I think tho, that the reason the cnc programs don't work in 3.5, 4.0, 2000, XP is because none of those versions allow the program to access the parallel port directly. It is not a matter of the software running rough in those versions. It doesn't run at all. Windows 95, 98, allows the software to control the cnc via the parallel port, but its rough.

I think with NT, XP etc. the software designer would need to write a device driver. None has done that that I know of.

Eric