Using a 32 K RAM card in the Atom, the 2114 RAM chips (used by the catalogue buffer #2000 - #27FF) on the FDC should be removed and the indicated modifications should be carried out.

The FDC card is not buffered. That explains why it should be connected by means of that silly very short (±10cm) connection cable. In the download-section, a doc file is available with the DOS Commands and the diagram.