CPC464 memory expansion.

[Roberts7531]

Hello, this is my first post here.
I was wondering if there are any schematics available for a ram expansion. I found some old sram chips (256K in total) and I was wondering how could I create my own RAM expansion board.

[GUNHED]

Hello, this is my first post here.
I was wondering if there are any schematics available for a ram expansion. I found some old sram chips (256K in total) and I was wondering how could I create my own RAM expansion board.

For the 464 the best solution is to take a look at Revaldhinos expansion, somewhere here in the forum.

[TotO]

And please, do not buy the PCB or the full RAM board from the Revaldhinos design sold by assholes on eBay... 

[Roberts7531]

I find it more interesting to build my own hardware, I've already created an expansion to allow data transfer from a pc. I will look for the Revaldhinos design

[revaldinho]

All the design info is here


https://github.com/revaldinho/cpc_ram_expansion/wiki


PCBs for the 6128 version are available on Seeed [size=78%]https://www.seeedstudio.com/gallery-user.html?id=292951&user=richarde[/size] (and yes, Seeed will let you have a pack of 10 bare boards including postage for less than the price some sellers on eBay charge for 1 !).


I don't seem to have made the 464 (CPLD based) PCBs available on the Seeed gallery, because I didn't really anticipate anyone building those themselves. I'll fix that. In the meantime though, I think I have some spare PCBs so PM me if you want one or perhaps even a kit of parts.


R

[VintageAdvantage]

All the design info is here

That's great and the way it ought to be in the vintage computing community these days.
Thanks for that!

[GUNHED]

To verify your RAM you can use this one...