Single axis A3977 stepper motor driver board for CNC Router Mill current 0-2A,12-36V ... -aisle adjustable current 0-2A rated output 2-phase bipolar stepper motor drive;2, standard parallel port interface, support for MACH2, MACH3 ... computer parallel port and equipment;4, supports 4 working modes:hybrid decay mode, fast decay mode, slow decay mode, normal decay ...