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out of date.
SYS1523
SYS1523Explanation
The required symbol has been left out or is misplaced.
Action
Edit the CONFIG.SYS file to correct or remove the incorrect command. Then
restart the system.