* [https://www.cpcwiki.eu/manuals/Vortex%20X-Laufwerke%20Manual.de.rar Vortex X-Laufwerke] {{DE}} (manual)
* [[Media:Manual de las Unidades Vortex.pdf|Manual de las Unidades Vortex]] {{ES}} (manual)
* [[Media:VDOS20X.ROM|VDOS 2.0-X ROM]] {{DE}} (German VDOS 2.0-X ROM for CPC 664/6128)
* [[Media:NEC_FD1035_Floppy.pdf|NEC FD1035 Datasheet (M1-X Floppy Disk Drive)]]
The X-drives for the CPC 664/6128 are connected directly to the floppy port. To provide VDOS, the "X-Modul" had to be installed to the expansion port. This is a single-ROM board containing a VDOS 2.0-X ROM and was also available with an additional RS232-C interface (named "XRS-Modul"). The 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.
* [[Media:VDOS20X.ROM|VDOS 2.0-X ROM]] {{DE}} (German VDOS 2.0-X ROM for CPC 664/6128)
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