Apple A9M0106 External 800k 3.5" Floppy Disk DriveExternal 3.5" 800K Floppy Disk Drive. Used with the Apple II series computers,Including Apple II, Apple II Plus, Apple IIe, Apple IIc+, Apple IIGS, and Apple LCs with Apple II cards. DB-19 connections.Will also work on a vintage Macintosh that supports an external floppy drive, like a Mac 512KE, Mac Plus, Mac SE. (Manual Eject button not functional when used on a Mac, only on Apple II's, by design)Drive has been tested and is guaranteed to work fine. Drive is nice and clean, no yellowing, all rubber feet in bottom intact, The following info is from WikipediaApple 3.5" Drive[edit]
Beginning in September 1986, Apple adopted a unified cross-platform product strategy essentially eliminating platform specific peripherals where possible. The Apple 3.5" Drive (A9M0106), is an 800K external drive released in unison with the Apple IIGScomputer, and replaced the beige-colored Macintosh 800K External Drive. It works on both the Apple IIGS as well as the Macintosh. It came in a case similar to the UniDisk, but in Platinum gray. Like the UniDisk 3.5, the Apple 3.5" Drive includes Apple II-specific features such as a daisy-chain connector which allows two drives to be connected to an Apple II computer, and the presence of a manual disk eject button. The Macintosh however could still only accommodate one external drive, and ignores use of the eject button. But, unlike the Macintosh 800K External Drive, the Apple 3.5" Drive can be used natively with the 64K ROM stock Macintosh 128K & 512K without the HD20 INIT, but only with 400K MFS formatted disks. Designed as a universal external drive replacement, the Apple 3.5" Drive was eventually compatible with the remaining Apple II models in production upon the introduction of the Apple IIc Plus and the Apple II 3.5 Disk Controller Card for the Apple IIe.