> It is more common to use binary divisible steps but it > does not have to be that way. One popular driver uses > 2000 steps/rev, my driver uses 1200 and 3600 steps/rev. Whoops! Forgot to mention that there are big benefits to NOT using binary divisible stepper modes as the (bad) resonances are all based on the binary divisible nature of the motor poles. Using stepper modes based on prime numbers; like 2000 (/5) or 1200 and 3600 (/3) give much better motor performance in regard to resonance problems. -Roman -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.