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documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.

SYS1235
 
Explanation
 
The diskette or drive type are incompatible with each other or the diskette
is unusable.
 
Action
 
Make sure the diskette drives are the same type, or that the correct type of
diskette is in the drive. For example, high- capacity diskettes (in a
high-capacity drive) can only be copied to high-capacity diskettes (in a
high-capacity drive).