This vintage ATARI Disk Operating System Reference Manual DOS 3 is a must-have for any collector or enthusiast of classic computing systems. With a spiral-bound format, it is easy to navigate and comes in English language. It is compatible with the Atari 400/800 and the Disk Drive. This manual is a great resource for those who want to learn more about the operating system and commands of the Atari system. It was manufactured in Singapore and is a unit type with a quantity of one. Get this piece of computing history today!