Smoothsteper to inaczej port LPT na USB z mozliwoscia wysylania segnalow o czestotliwosci 256 kHz.

Niestety, plyte glowna musisz kupic.

Cytat z dokumentacji Smoothsteppera:

Z sekcji 7.0:

"The SmoothStepper is intended to be used with breakout boards that make it easier to wire motors
and switches,"

Z sekscji 7.2:

"The SmoothStepper was designed to be a parallel port replacement."