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documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.

SYS1187
 
Explanation
 
One of the following conditions exists:
 
1. The disk is full.
2. The file or drive is in use or locked
   by another process.
3. Too many files are already open.
4. The target file is a read-only file.
5. A disk error occurred.
 
Action
 
Correct the problem or wait. Then retry the command.