Cloning DDI-1, need to borrow one

[TFM]

Why not using an advanced version of the FDC765, some copy protection uses them ... so .... we would have a cracking floppy 

[TotO]

Why not using an advanced version of the FDC765, some copy protection uses them ... so .... we would have a cracking floppy

It was my idea...
Using a PC FDC will allow to dump and write protected floppies with the appropriated software.

[TFM]

It was my idea...
Using a PC FDC will allow to dump and write protected floppies with the appropriated software.

Yes, it was your idea   I had to adopt it, because I couldn't find a better one

[plazma]

Does anyone have schematics for standard 64kB RAM expansion?


I would like to see what is needed to include extra 64kB RAM to the DDI-1 clone.

[IanS]

I'm not aware of a schematic for an external memory upgrade.

It has been discussed -
464 and ram extension ....
(There is a link to some board pictures I took in that thread, or some pictures here - Upgrading a Dk'tronics RAM Expansion - CPCWiki)

As it details in the thread, you will need to short MREQ and A15 to +5V to get modes c4-c7 to work.

The recent thread about the 6128 PAL may give some useful info - Amstrad 6128 HAL/PAL16L8 chip

[Bryce]

The device here - Upgrading a Dk'tronics RAM Expansion - CPCWiki) is mine. I could work out the schematics from the PCB, but without a dump of the PAL it's not going to be of much use to you.

Bryce.

[plazma]

Thanks for the info. I'll skip the RAM from this project.
It would be nice to reverse engineer the RAM expansion and use a newer single 64kB chip. But maybe after this is finished.

What do I miss with CPC464 with only 64kB RAM?

[Bryce]

What do I miss with CPC464 with only 64kB RAM?

Not much.

Bryce.

[Gryzor]

The right to plaster a "128k" badge on it?