## Input/Output Device Driver Reference

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### Return Codes

The error codes that the parallel port device driver returns are listed below:

8102h Device not ready

8103h Unknown command

8109h Printer out of paper

810Ah Write fault

810Ch General failure

8111h Character I/O call interrupted

8113h Invalid parameter

If the parallel port device driver does not support a request, a status of 8103h (unknown command) is returned.