Changes

The X-drives for the CPC 664/6128 are connected directly to the floppy port. In order to provide VDOS, the "X module" (sometimes also called "VDOS module") must be connected additionally to the expansion port. This contains a ROM board that contains provides a VDOS 2.0-X ROM and was also available with an additional RS232-C interface (in this case called "XRS module"). The board supplied for the CPC 464 version came in a clunky housing in which both the "X(RS) module" and the DDI-1 controller had to be installed.