The Plus D is a floppy interface for the Zx Spectrum very popular in its time manufactured by the MGT company.PLUS D (Version 1.0)AuthorJosé Leandro Novellón. Link to projecthttp://trastero.speccy.org/cosas/JL/PlusD/PlusD-v1-0.html Link to similar projecthttp://trastero.speccy.org/cosas/droy/plusd/plusd_s.htm Link to projecthttps://github.com/merlinkv/PlusD_Clone