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The pages on this site contain documentation for very old MS-DOS software, purely for historical purposes. If you're looking for up-to-date documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.

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  Message:      RT003
 
  Text:         Serial mode error
 
  Severity:     Recoverable
 
  Explanation:  You have tried to open a device as a relative or indexed
                file.
 
                You are trying to execute a device, not a program.
 
  Resolution:   Open the device in the correct mode or close any open
                files, do STOP RUN and recode your program.
 
                The name of your program is recognized by the Operating
                System as a valid device. Rename your program.
                                    -♦-