9.11.4|Using the 8255 to Interface a Stepper Motor
Since we are trying to run the stepper using a sequence generated by the 8086, we also use the
8255 to send the sequence through one of the ports. e motor, however, cannot be driven
directly by the parallel port, because the motor requires a current much more than can be sup-
plied by the 8255. (e exact current requirement depends on the specifi cations of the particular
motor being used). As such, current drivers are needed between the 8255 port lines and the leads
of the motor. Transistors with high current capability (e.g. Darlington pair or power transistors) ...
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