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out of date.
SYS1590
SYS1590Explanation
PATCH could not find instructions for patching a file in the patch
instruction file.
Action
Check the patch instruction file for errors or contact the supplier of the
patch instruction file.