=== X(RS)-Modul ===
The X-drives for the CPC 664/6128 are connected directly to the floppy port. To provide VDOS, a the "X-Modul" had to be installedto the expansion port. This was is a single-ROM board with containing a VDOS 2.0-X ROM and came in two versions, one of which providing was available also available with an additional RS232-C interface (named "XRS-Modul"). The versions board supplied for the CPC 464 version came with a chunky housing in which both the "X(RS)-Modul " and the DDI-1 had to be installed.
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