Ahhhhhhh.... All that means is that, unlike Mach3 or Mach4 using the parallel port, when using a PMDX SmartBOB (any of them), or a SS, the step pulses are generated *ON* the SmartBOB (or SS), and it (mostly) does not matter what speed CPU you have in your computer, or how quickly it can service the high-speed interrupt needed to bit-bang the step pulses out the parallel port. With the parallel port driver, some PCs have trouble generating a smooth pulse stream.
In more technical terms, the SmartBOB handles all of the "real time" (time critical) operations, not the PC.
Is that any cleared, or am I talking myself in circles?