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Opus WD2791 Disc Controller (top)
Opus WD2791 Disc Controller (bottom)
An alternate disc controller to the Acorn 8271 DFS controller. The WD2791 disc controller supports single and double density modes, but a search for a data sheet for it has not been successful. The WD2791 disc controller requires the Opus EDOS DFS to be installed in a sideway ROM socket, while the daughterboard plugs into IC78 in the BBC micro.
In July 1985 Acorn User published a comparative review of DFSs titled "DFS Command Performance ".