Amstrad CPC 664/6128/Plus models, are equipped with external drive connector, where you can plug a 3.5" Disk/Gotek/HxC Drive, using a ribbon cable:
You might also need a power supply splitter cable:
*note: Amstrad Plus needs extra adapters (also available).
*note: Amstrad Plus needs extra adapter (also available).
Finally, if you want to use the internal 3" drive of an Amstrad CPC 664/6128 you will need a 12v Psu with custom female connector:
Anyone interested, please contact at: ikonsgr745@hotmail.com
Help photos: