Description: Four-phase stepper motor is a single four-beat, 8255 stepper motor drive output signal, the motor coils A, B, C, D four-phase by the 8255 PC port PC0-PC3 control, counter-clockwise: D → DC → C → CB → B → BA → A → AD → D → ..., clockwise: DA → A → AB → B → BC → C → CD → D → DA → ... keyboard control the speed of 0 to 9, B and C to control the direction, F exit the Digital display S.SPEED-i, i is the speed
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stepper motor.txt
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