CPCDiskAdapter

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A Universal Floppy Disk Drive Adapter for the Amstrad / Schneider CPC 464

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# CPCDiskAdapter
A Universal Floppy Disk Drive Adapter for the Amstrad / Schneider CPC 464

## Purpose

A versatile floppy disk drive adapter board for the Amstrad /
Schneider CPC.  This printed circuit board (PCB) is primarily intended
for the CPC 464.

![Board Front](https://raw.githubusercontent.com/lambdamikel/CPCDiskAdapter/master/images/floppy-adapter-board-front.png)

![Board Back](https://raw.githubusercontent.com/lambdamikel/CPCDiskAdapter/master/images/floppy-adapter-board-back.png)

The Gerbers are [here.](gerbers.zip)

Connecting disk drives other than the standard Amstrad DD1 / FD1
drives to the CPC via the DDI-1 disk controller usually requires some
floppy cable mods. Moreover, these mods usually fix the drive to
either being CPC A or B drive.

With this adapter board, one can flexibly use the DIP switches to
select 2 out of 3 possible disk drives, and flexibly determine which
one is A or B. Moreover, no more (destructive) cable mods are required
with this board.

The following drives can be used:

- the standard Amstrad DD1 / FD1 3" floppy
- standard PC 3.5" floppy (with READY signal if possible) 
- 5.25" floppy (with READY signal if possible) 
- Gotek floppy drive

If the drive does no emit the READY signal, then it can be "faked" by
grounding the READY line with the corresponding READY DIP switch (this
is a standard CPC floppy cable hack).

The pictures show an application example - I am using the Amstrad
DDI-1 disk controller and an old 2bay SCSI enclosure.

[Check out the schematics.](schematics.pdf)

Notice that the sockets labeled **I1 and I2 are the input sockets for
the Amstrad DDI-1 connectors** - in case of the DDI-1 controller, both
of these need to be used, in order to recover the A (DS0) and B (DS1)
drive selection lines. With a different controller it may be
sufficient to only use one of these sockets. Also, **O1, O2, and O3
are output sockets** and are used for connecting the drives. Moreover,
**5V is not supplied over the adapter.**

## Using the Amstrad DDI-1 Disk Controller

Please note that by default / factory setting, **the DDI-1 is powered
by the DD1 / FD1 3" disk drive**. However, this adapter DOES NOT
connect the 5V power lines in order to protect other drives - powering
drives over the ribbon cable was a proprietary Amstrad invention, and
can destroy drives such as the Gotek. Hence, in order to be able to
use the DDI-1 with this adapter board, a **DDI-1 modification has to
be applied: the DDI-1 has to be powered over the CPC expansion bus.**
This [modification is described
here.](http://www.cpcwiki.eu/index.php/DDI_Modification]).

I recommend putting a switch in the DDI-1 such that the mod can be turn on and off as needed.

## Application Examples

![Adapter 1](https://raw.githubusercontent.com/lambdamikel/CPCDiskAdapter/master/images/adapter1.JPG)

![Adapter 2](https://raw.githubusercontent.com/lambdamikel/CPCDiskAdapter/master/images/adapter2.JPG)

![Adapter 3](https://raw.githubusercontent.com/lambdamikel/CPCDiskAdapter/master/images/adapter3.JPG)

![Adapter 4](https://raw.githubusercontent.com/lambdamikel/CPCDiskAdapter/master/images/adapter4.JPG)

![Adapter 5](https://raw.githubusercontent.com/lambdamikel/CPCDiskAdapter/master/images/adapter5.JPG)

## How it Works

Simple. Each drive has a Drive Select 0 (DS0) and Drive Select 1 (DS1)
input. By default, DS0 is used for the A connector of the DDI-1, and
DS1 for its B connector. Moreover, DS1 is not connected for A, and DS0
is not connected for B in the DDI-1 floppy cable. The purpose of the
two I1, I2 sockets is to recover both DS0, DS1 signals. In addition,
each individual disk drive is also jumpered (or configured) to either
respond to DS0 or DS1; sometimes, it response to both, like the
Amstrad DD1 / FD1 drives.

Hence, for each of the three connected drives, the DIP switch allows
to select the following signal routes: A -> DS0, B -> DS0, A -> DS1,
and B -> DS1. A drive which is jumpered to respond to DS1 can be made
to act as an A drive via A -> DS1; vice versa, a drive that is
configured for DS0 can be made to react to B: B -> DS0. The routing
can be determined for 2 of the 3 connected drives individually. To
disable a drive, make sure all DIP switches for the correpsonding
drive are in OFF position (it will then neither respond to A nor B).

## PCB Production

The PCBs [can be ordered from OshPark.](https://oshpark.com/shared_projects/rtc6nzZu)

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