Assume that a 4-winding stepper motor is connected to the data port of the standard parallel port at address 0378H. The stepping angle of the motor is 10o and the motor rotates at 4 different speeds. The speed levels are 0 rpm, 100 rpm, 200 rpm and 300 rpm respectively. Write an assembly language program to control the motor speed by using up (u) and down (d) keys from the keyboard. Each time u is pressed the motor speeds up one level and each time d is pressed the motor slows down one level. The user presses x to terminate the program.