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.
Quote from: Roberts7531 on 14:39, 17 March 20
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.
And please, do not buy the PCB or the full RAM board from the Revaldhinos design sold by assholes on eBay... :-\
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
All the design info is here
https://github.com/revaldinho/cpc_ram_expansion/wiki (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 (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
Quote from: revaldinho on 18:03, 17 March 20
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!
To verify your RAM you can use this one...