Changes

* DDI-1 - : a set, consisting of the real DDI-1 (= Disk Drive Interface) and a FD-1 3" disk drive, as well as the CP/M 2.2 license and disk.<br> This set was for the CPC464 which didn't have a built-in [[765 FDC]] disk controller.

This set was * FD-1: a 3" disk drive as secondary disk drive unit for the CPC464CPC664, which doesn't have CPC6128, and for the disk controller builtCPC464 with DDI-in.1

* FD-1 - a 3" disk drive as secondary disk drive unit All drives are for the CPC664, CPC6128 and CPC464 use with DDI-1[[CF2 Compact Floppy Disc]] 3" discs.

Note that there There was no official external disk drive for the 6128Plus or even the 464Plus. The difference between a CPC664/CPC6128 and a 6128Plus was simply a changed pin-out which can easily be solved by a new plug on the disk drive's cable.

While the difference between a CPC664/CPC6128 and a 6128Plus The 464Plus was simply harder to equip with a changed disk drive. Although the pin-out which can easily of the expansion port was left unchanged, the DDI-1 cannot be solved by a new plug used on the disk drive's cable464Plus without modifications (see [[Connecting a Disc Interface to CPC464+]]).

The two disk drives were identical, the only difference was that the DDI-1 shipped with controller, manual and CP/M 2.2 on one disk. The disk drives were jumpered (rather: more accurately, soldered) to react on both drive selectsselect lines, A: and B:.

* On the CPC664 and CPC6128 computers, DRIVE SELECT 0 was not wired externallyconnected on the external connector, so the drive could only become drive B: on these systems.* For the DDI-1, DRIVE SELECT 0 was only wired to the outmost outermost connector of the attached cable, while the inner connector was wired to DRIVE SELECT 1 only, thus the drive at the cable's end always became A: while the other one became drive B: accordingly.

Note that the drive also powered the DDI-1 interface when used together with it: . Certain pins documented as N/C in the CPC664/CPC6128 manual in fact carry +5V from the drive to the controller.The main benefit of reason for this was, that you couldn't connect a standard drive with a more common format (5¼" in the beginning, 3½" later and today) and thus cheaper disks as drive A: without modifications, as the DDI-1 wonwouldn't work without the power fed from the FD-1.

<gallery caption="DDI - 1"> Image:ddi1.gif|Amstrad FD-1/DDI-1 disk drive= Pictures ==

== Datasheets == * [[CategoryMedia:HardwareUPD765 Datasheet OCRed.pdf]] - uPD765 disc controller* [[Media:FDC9229BT Datasheet.pdf]] - FDC9229BT data separator (that usually assists the uPD765 chip)* [[Media:DDI Schematic.png]] - DDI-1 Schematic (disc interface for CPC464)  [[Category:Peripherals]] [[Category:Manual]][[Category:DATA Storage]][[Category:CPC Internal Components]][[Category:Amstrad Products]]