Based on the Proteus, 89C51, L297/L298 schematic diagram of the stepper motor and the original code, to achieve positive stepper motor to speed up slow down

PROTEUS-STEP
............\L297298.DSN
............\L297298.PWI
............\Last Loaded L297298.DBK
............\MOTORTEST.ASM
............\MOTORTEST.hex
............\MOTORTEST.lst
............\MOTORTEST.SDI
............\sm297.ASM
............\sm297.hex
............\sm297.lst
............\sm297.SDI

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