Does the cnc software output pulses for the steppers, or do I need some sort of pwm ? I've changed my mind about the PIC, opting to use logic ic's instead. Can I simply make a logic chain, outputting pulses from i.e turbocnc, straight into a transistor feeding the steppers from a ATX power supply, or do I need another step doing PWM ? I found a driver ic at elfa, but as this is a educational experience for me, i'd like to do it a bit more "manual"