I just brought a L293D and has a M42SP-7 bipolar stepper motor which I take out from my old printer. This bipolar stepper motor has 4 wires ( 3 orange colour and 1 blue colour). May I know which lead wire is ( A, A bar, B and B bar) as mention in its data sheet? I know that the resistance of a same coil wire is very low. How do I know which one is A and A bar in the same coil? Can anyone tell me what is the control sequence of this bipolar stepper motor? The bioplar stepper motor data sheet I have attach it with this forum. Thank you first for your kind help. 
