NOTE: Please read all instructions carefully before attempting to operate the ATARI 815 Dual Disk Drive. Improper use can result in damage to the system.

Your ATARI 815 Dual Disk Drive is a record/playback device that allows you to store and retrieve large amounts of computer data quickly and accurately. By attaching the Dual Disk Drive to your system, you greatly enhance the storage capacity of your ATARI 400 or ATARI 800 Personal Computer System. This manual explains the requirements and procedures for attaching your ATARI 815 Dual Disk Drive to the computer console. Refer to the Disk Operating System II (DOS II) Reference Manual and the ATARI BASIC Reference Manual for information on how to use the features of your disk drive system.

The ATARI 815 Dual Disk Drive is a double-density drive. Each drive stores twice as much data on a diskette as the ATARI 810™ Disk Drive. "Dual" means there are two disk drives in the same housing. In comparison, therefore, the ATARI 815 Dual Disk Drive stores four times as many bytes (368K bytes on two diskettes) of information as a single-density, single-disk drive unit like the ATARI 810 Disk Drive.

When you turn OFF the computer, you lose all programs or data stored in Random Access Memory (RAM). Using your ATARI 815 Dual Disk Drive to store and retrieve information to and from diskette will eliminate the need to retype programs and data each time you want to use them.