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out of date.
Disk not ready
The disk-drive door is open, or no disk is in the specified
drive. Insert a disk in the drive, close the drive door, and
retry the operation.
ERR code: 71