Expert DOS Tutor IBM PC XT AT Software 5.25 & 3.5 Floppy Disk COLLECTIBLE AS IS The product is an Expert DOS Tutor software designed for IBM PC XT AT computers, stored on both 5.25 and 3.5 floppy disks. It is a vintage programming tool from the United States, specifically designed for operating systems running on DOS. The software, branded by IBM and called Tutor, is a valuable collectible item for computer enthusiasts interested in nostalgic software from the past.