About 7 or 8 years ago I fixed a language card for a guy. He had his businesses database on an Apple II on 13 sector disks. I don't recall the program but the guy had a special chip on the motherboard that was needed to run the program. He would have liked to upgrade but didn't have the time to enter his whole database in a new computer. I was too busy at the time to see if other software would read the files.