Changes

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 and was also available with an additional RS232-C interface (in this case called "XRS-Modul"). The ROM board supplied for the CPC 464 version came in a chunky housing in which both the "X(RS)-Modul" and the DDI-1 controller were installed.