Assume that a 4-winding stepper motor is connected to the Port A of 8255 PPI at address 0850H. The stepper motor moves by an angle of 5° at every step. Write a program which continuously checks LSB of port B to decide the direction of the motor. If LSB of Port B is 1 motor rotates clockwise, otherwise the motor rotates anticlockwise. The speed of the motor is continuously controlled by the MSB of Port C. If MSB of Port C is 1 motor rotates at 100 rpm, otherwise it rotates 200 rpm. (Hint: Assume that WAITF subroutine is already defined with a base delay of 15.085 us)