'''Amstrad''' made two different [[disk drives ]] for the Amstrad/Schneider CPC range:
* 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 doesndidn't have the disk controller a built-in[[765 FDC]] disk controller.* FD-1 - a 3" disk drive as secondary disk drive unit for the CPC664, CPC6128 and CPC464 with DDI-1
Note that there was no official external * FD-1: a 3" disk drive as secondary disk drive unit for the 6128Plus or even the 464Plus. While 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 for the disk drive's cable, the 464Plus was harder to equip CPC464 with a disk drive: Although the pin-out of the expansion port was left unchanged, the DDI-1 cannot be operated on the 464Plus without modifications.
All drives are for use with [[Image:ddi1.gif|thumb|Amstrad FD-1/DDI-1 disk driveCF2 Compact Floppy Disc]]3" discs.
== Technically Speaking ==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.
The two 464Plus was harder to equip with a disk drives were identical, drive. Although the pin-out of the only difference expansion port was that left unchanged, the DDI-1 shipped with controller, manual and CP/M 2.2 cannot be used on one diskthe 464Plus without modifications (see [[Connecting a Disc Interface to CPC464+]]).
== Technical Details == 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:.
The cable decided which drive became A: and which one became 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. Details on [[AMSDOS]], Amstrad's implementation of [[CP/M]] can be found in [[Soft158A:_DDI-1_Firmware_-_The_Complete_CPC_464_DOS_ROM_Specification|DDI-1 Firmware SOFT158A]]. == Pictures == <gallery>Image:Fd-1.jpg|FD-1 (disc drive)Image:DDI-1 Tomdalby.jpg|DDI-1 (disc interface)Image:DDI-1 ISS3 MF0004B.jpg|DDI-1 (pcb)Image:DDI Schematic.png|DDI-1 (schematic)Image:Gerald DDI-1 MF0004B.jpg|DDI-1 (top)Image:Gerald DDI-1 MF0004B-Back with ABBA switch mod.jpg|DDI-1 (bottom)Image:DDI1_PCB_Top.jpg|MF0004B Models 9,5,3 and 1 PCB (top)Image:DDI1_PCB_Bottom.jpg|MF0004B Models 9,5,3 and 1 PCB (bottom)Image:ACU850102 -012.jpg|Advert (ACU Jan 1985)Image:Amstrad Computer User8504 044.jpg|Advert (ACU Apr 1985)Image:DDI-1_cable.jpg| DDI-1 cable pinoutImage:DDI-1.jpg|DDI-1 - complete with manual, interface, FD-1 drive & CF-2 discs</gallery> == Covers == <gallery caption="Manuals"> Image:Amstrad DDI-1 Manual En.jpg|(English) User ManualImage:DDI-1 User (German) Manual.jpg|(German) User ManualImage:Manual de Usuario del DDI-1.jpg|(Spanish) User ManualImage:DDI1-FD1 Service Manual.jpg|Service Manual </gallery>
== Manuals ==
* [http://www.cpcwiki.eu/manuals/ddi-1.zip Amstrad DDI-1 (English) Manual]* [http://www.cpcwiki.eu/manuals/DDI-1.es.rar Amstrad DDI-1 (Spanish ) Manual]* [[Media:DDI-1_Handbuch.pdf]] (German) Manual
== Service Manual ==
* [http://www.cpcwiki.eu/manuals/DDI-1%20FD-1%20Service%20Manual.en.rar Amstrad DDI-1 FD-1 Service Manual]
== 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]]