[sedatk]

You could attach an external floppy drive (I believe it was called FDD-1) to CPC464 and run CP/M 2.2 on it. https://www.cpcwiki.eu/index.php/CP/M_2.2

[Doctor_Fegg]

DDI-1. It was a package including the disk interface (with AMSDOS in ROM and CP/M 2.2 partly in ROM) plus the drive itself. The FDD-1 was an optional second drive but you had to have the DDI-1 first.