Important Notice

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documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.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:      RT109
 
  Text:         Invalid checksum in Run-Time System
 
  Severity:     Recoverable
 
  Explanation:  The internal information within the run-time system
                has been altered. The run-time system may have become
                corrupted, or you may have illegally attempted to change the
                internal run-time system information.
                                    -♦-