i purchased a 1999 model router with the aniheim 1/2 steppers and dos controller a couple of years ago, i was advised an did replace the drives and motors to keling, i went with the wincnc but mach 3 will work just fine, initially i used the keling drivers ( i liked the switching for power ) but have recently switched further to the gecko 201's they are smoother and i would recommend you do this for the same reason i did, " you will eventually have to do this" it was well worth it and now the reliability of that router is the last thing on my mind

jim