[Coco] VDG replacement

[didier derny]

Frankly I had a bad experience with the GODIL
My designed worked well on the nexys board

But when I moved to a godil I had a series of problems

- it was draining a lot of current
- it's big and hard to fit in place of a standard chip
- bad godil (replaced after 4 weeks trying to make it works)

I also tried this product:
http://www.enterpoint.co.uk/component_replacements/craignell.html
[a version exist with sdram]

- I also received a bad product :(

In both case I make it works but no so reliable :(
Apparently the problems comes from the level shifters

-----Message d'origine-----
De : Coco [mailto:coco-bounces at maltedmedia.com] De la part de Mark McDougall
Envoyé : mardi 11 novembre 2014 03:50
À : CoCoList for Color Computer Enthusiasts
Objet : Re: [Coco] VDG replacement

On 11/11/2014 12:03 PM, Kandur wrote:

> The GODIL alone is appx. $90

A VDG replacement was never going to be cheap; you only need to look at the
GODIL PCB to see what's involved. As well as voltage translation you also
need power supplies for the FPGA, and on this generic product you also have
logic for user options.

I'm not overly familiar with Xilinx-brand FPGA's and their capacities, but
I'm guessing you'd get a good chunk of the whole Coco in there, not just the
VDG... so...

Regards,

-- 
|              Mark McDougall              | "Electrical Engineers do it
|  <http://members.iinet.net.au/~msmcdoug> |   with less resistance!"

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