I have been building my desktop router and have been screaming with frustration trying to get my steppers to run smoothly. I have three XP PC boxes all working and cleaned of trash proggrammes. All three give ragged pulses to my steppers? A chance conversation with Angeltec revealed that around 50% of his old XP PC`s will not run Mach3 successfully? Following that I tried my system with a PC already running my old Mach3 router and "bobs your uncle" every thing worked perfectly?

So is this a common problem?? If so are these other three PC`s able to be adapted in some way.