This is the Apple II 3.5″ Disk Controller Card v1.0 from Ultimate-Micro.com.
The Apple II 3.5″ Disk Controller Card v1.0 is a clone of Apple's Apple II 3.5″ Disk Controller Card. The disk controller card allows you to use 3.5-inch floppy disk drives, including the Apple SuperDrive and Apple 3.5 Drive, with all Apple II computers. This card also supports the operation of older model Apple II UniDisk 3.5 drives.
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