Changes

'''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 3" disk drive units including the controller for the CPC464 computer* FD-1 - a 3" disk drive , as well as secondary the CP/M 2.2 license and disk drive unit .<br> This set was for the CPC664, CPC6128 and CPC464 with DDIwhich didn't have a built-1in [[765 FDC]] disk controller.

[[Image:ddi1.gif|thumb|Amstrad * FD-1/: a 3" disk drive as secondary disk drive unit for the CPC664, CPC6128, and for the CPC464 with DDI-1 disk drive]]

Technically speaking, the two disk All drives were identical, the only difference was that the DDI-1 shipped are for use with controller, manual and CP/M 2.2 on one disk[[CF2 Compact Floppy Disc]] 3" discs.

The There was no official external disk drives were jumpered (rather: soldered) to react on both drive selects, A: for the 6128Plus or even the 464Plus. The difference between a CPC664/CPC6128 and B:a 6128Plus was simply a changed pin-out which can easily be solved by a new plug on the disk drive's cable.

The cable decided which 464Plus was harder to equip with a disk drive became A: and which one became B::. Although the pin-out of the expansion port was left unchanged, the DDI-1 cannot be used on the 464Plus 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 (more accurately, soldered) to react on both drive select 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 connected 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 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 (5.255¼" or 3.5in the beginning, 3½"later and today) and thus cheaper disks as drive A: without modifications, as the DDI-1 wonwouldn't work without the powerfed 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 == * [[Media:UPD765 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]]