This is simple ASM code to rotate stepper motor in clockwise motion. You have to attach ULN2003 IC to microcontroller and output of ULN2003 should be attached to Stepper motor. I tested this code with four coil stepper motor. You can create HEX file

微机实验一实验报告 通过8255芯片，实现交通灯功能，以及开关控制LED灯实验 ASM文件汇编语言编写-Experiment of Microcomputer a 8255 chip, the function of the traffic lights, and switch controls the LED lights Experimental ASM file written in assembly language