Hi Bear:
You can, or at least you can usualy use many of the components. The lucky ones find they already have step/direction drivers in theri controls, so they need only a breakout board,
for others, they can use th emotors and poiwer suplies, and just need drivers and a breakout board. All depends on the original control. Basically, you keep whatever you can, and replace
whatever wont work in a step/direction context..
ARt