DDI-1 external disc drive with Disc interface (a choice of either replaced with ParaDOS ROM - recommended to do it for CPC 464+ or leave the AMSDOS ROM inside the disc interface - for using DR. LOGO on upgraded CPC 464) from the pass-through connector on the ROMBOX
3.5” external disc drive with external power supply, [[Side Select Switch|Side Switch]], READY signal and a drive lead with 34 way IDC Male connector (34 pins sticking out) to the back of DDI-1 disc interface and place this disc drive on top of DDI-1 external disc drive - if you not sure how to, then follow "[http://www.cpcwiki.eu/index.php/Adding_3.5%22_drive_to_CPC464|Adding 3.5" Disc Drive 'B' - For CPC 464 Series with DDI-1 only!!]" instructions.