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General Category => Amstrad CPC hardware => Topic started by: tjjq44 on 19:44, 31 October 16

Title: DK'Tronics 64k or more clone
Post by: tjjq44 on 19:44, 31 October 16
Hi, I'm actually looking for a 64k memory expansion for my cpc464. I want it to be compatible with "Orion Prime" and as much 128k demos as possible. "DK'tronics" seems to be actually the most compatible ram expansion.


The only drawback -> so high prices for these little boxes on the internet!!! In 2012 Bryce was talking about making a DK'Tronics compatible 512k ram board, what about it? Is there any alternative?
Title: Re: DK'Tronics 64k or more clone
Post by: TotO on 20:29, 31 October 16
The X-MEM does the job, and add ROM features too.  ;)
http://www.centpourcent.net
Title: Re: DK'Tronics 64k or more clone
Post by: MacDeath on 21:32, 31 October 16
haha, tu perds pas une occasion de perdre de ton temps libre, toi...
 :'(
Title: Re: DK'Tronics 64k or more clone
Post by: tjjq44 on 14:06, 01 November 16

Yes I've already seen the X-MEM solution but it uses modern technology and I want to keep the 80's spirit in my modifications, that's why I don't use any gotek or HXC emulator but real 3.5" drives with ready signal available on pin 34 :-)

In addition, I saw that on their page too: "STMicroelectronics Z80 CPU cause compatibility problems with 464/664. Please, replace it by a Zilog Z8040004PSC"

I don't want such a complicated thing which in addition needs CPU replacement, I'd rather like a simple ram expansion (compatible dk'tronics) or at least the schematics to build one by myself. ;-)
Title: Re: DK'Tronics 64k or more clone
Post by: TotO on 15:04, 01 November 16
Yes I've already seen the X-MEM solution but it uses modern technology and I want to keep the 80's spirit in my modifications, that's why I don't use any gotek or HXC emulator but real 3.5" drives with ready signal available on pin 34 :-)
You hurt me, because I have took care with my boards to only use old technologies as Amstrad have used in its time.  :o
Only 5v compatible through pin parts here... Most of them was available in 80s 90s or was replacement of them.
(in fact, Amstrad used more modern technologies on the last CPC and PLUS series)
Title: Re: DK'Tronics 64k or more clone
Post by: tjjq44 on 15:59, 01 November 16
The project I'm working on is to modify a DDI-1 interface to integrate 64k ram expansion inside (there's enough room to put a 2nd custom PCB). Your X-MEM board is cool but I don't see how I'd be able to fit it in the case... sadly!


Here's my interface opened

(http://tjjq.free.fr/cpc/DDI-1.jpg)


As you can see, the connector is in the middle so the custom board will have to surround it ;-) I've seen photos of dk'tronics boards on the wiki but I can't read all the references on the components -> I'm stuck in making my own board... :-(
Title: Re: DK'Tronics 64k or more clone
Post by: TotO on 17:41, 01 November 16
About your project, it will be more easy to redo a PCB to embed all the features and fit into the DDI-1 case.  ;)
(I have a 64K RAM expansion without the case if you want... But, I'm not sure your hack will be easy to do)
Title: Re: DK'Tronics 64k or more clone
Post by: tjjq44 on 18:43, 01 November 16
Wow, that could be the solution, Yes I'll have to make a custom PCB and fit the components from your ram expansion on it but this isn't a problem for me :-)
Title: Re: DK'Tronics 64k or more clone
Post by: TotO on 18:58, 01 November 16
How do you plane to connect the two PCB?
Title: Re: DK'Tronics 64k or more clone
Post by: tjjq44 on 19:12, 01 November 16
The custom PCB will have a rectangular hole in the middle so it will slide thru the connector and sit over the DDI-1 PCB. I'll have to solder 50 wires between my custom PCB and the connector's extender (visible on my photo).