** Part Bx, which is also the full cable for the CPC464 with DDI-1, can even be used to connect the PC drive as A: on the DDI-1, though this doesn't work with all drives.
* Although schematics for drives without own RDY-Signal are given, it is highly recommended to use drives with RDY to ensure maximum compatibility. The only todays drive known to be resolderable to output a RDY-signal is the Samsung SFD-321B and many drives won't work as A: on the CPC464+DDI-1 without a permanent RDY though. Many PC disk drives can be [[Modified|Modify PC floppy drives|Modified]] to output a real RDY-Signal.
* These schematics differ from most existing schematics on the web in that way, that they don't use GND to pull signals active low, but the /DRIVE SELECT line via diode. This ensures that the other drive on the bus doesn't become influenced. You can solder the wire containing the diode directly (without the diode) to a GND-wire and you will get the same as described in other tutorials but the side switch and - if applicable - the permanent RDY will also be in effect for the other disk drive then.