[Coco] Coco3 512KB sram upgrade

[Sylvain Rousseau]

I attached a zipped bitmap file.
 
This is a quick look of what I did.  All the logic is done in a CPLD (Lattice ispLSI1016e, PLCC44, it's what I have in stock).
You can do it with an other CPLD or with discret logic ICs.
 
Sylvain


----- Message initial ----
De : Robert Gault <robert.gault at worldnet.att.net>
À : CoCoList for Color Computer Enthusiasts <coco at maltedmedia.com>
Envoyé le : mercredi 22 novembre 2006, 09 h 26 min 15 s
Objet : Re: [Coco] 512KB SRAM upgrade


Sylvain Rousseau wrote:

> Hello,
> 
> I just finished the design for a 512KB sram upgrade for Coco3.  I have only one Coco3 so I'm afraid to try it in it until I got a spare Coco3 or a spare Gime chip.
> 
> If it works well, I want to make the design public.  I can give the design to Mary to put on the Coco Nutz E-zine.
> 
> If someone can help me to get a spare Coco3 or a spare Gime chip, please let me know.
> 
> P.S. I already have a spare MC68B09EP.
> 
> Regards,
> 
> Sylvain
> Quebec
> Canada
> 
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Perhaps if you e-mail the schematic to someone like Mark Marlette, you 
would get a second opinion on whether the design would work if there 
were no mistakes in construction.

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