Kp206b-ub Driver Direct
I picked up a batch of these from a surplus auction, labeled only as "Stepper Controller." No pinout, no voltage rating, no website on the silkscreen. After a few hours of bench testing, multimeter beeping, and a little bit of magic smoke (none escaped, thankfully), here is what I figured out.
: Run the installer (often found in the "Drivers & Demo" section of the manufacturer's site), select the appropriate port (e.g., USB001), and set it as the default printer in the "Devices and Printers" control panel. kp206b-ub driver