In a short SBASIC program a filename P$ is to be entered, and then it
proceeds to print
Copy_N P$, Ser$ where Ser$ is preset to the correct format for the
printer.
If the filename was entered wrongly, then the program exits with an
error message. How can I ensure either that the name entered is valid,
or error trap to revert to the entry screen with the appropriate message
to try again.
Bryan H
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