This is the card used to control the Apple 5.25 Drive, UniDisk and DuoDisk 5 1/4″drives.
Apple 820-5003-A, Stamped on card 655-0101- One in picture is a Rev. C
External 19 pin D (DB-19) connector. Connector cable included.
Used in Apple ][, ][ Plus & //e. Connect two drives to this card by daisy chaining them together!
Later revisions renamed this card to Apple 5.25 Drive Controller, the numbers remain the same, and you may receive either one depending on availability.