The X-drives for the CPC 664/6128 are connected directly to the floppy port. In order to provide [[VDOS]], the "X-Modul" (sometimes also called "VDOS module") must be connected additionally to the expansion port. This contains a ROM board that provides a VDOS 2.0-X ROM. The ROM board supplied for the CPC 464 came together with a chunky housing in which both the "X-Modul" and the DDI-1 controller were installed. All variants were also available with an additional RS232-C interface (in this case called either "XRS-Modul" or "X-Modul/RS").
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Image:Vortex fd1 464 controller 1.jpg|XRS-Modul (CPC 464)