[Coco] CoCo3 FPGA project analog boards

[Dave Philipsen]

Hi Mike, 
I saw your message and thought I'd just chime in because I have some info that might help you. There have been two different SRAM chips used on the DE1s over the years.  If you buy a new DE1 right now you'll get a chip with a 'BLL' suffix, I believe. This is the chip that has caused us a lot of headaches with the CoCo3FPGA because the timing is just a little different.  The older DE1s use a chip with an 'AL' suffix and it seems to work just fine.

I have replaced the 'BLL' chips on a number of DE1 boards with the 'AL' chip and they all work great after that.  The process of replacing the chips is a delicate matter because it's a surface mount chip that requires a little skill, determination, and patience to replace.  What I have been doing is acquiring second-hand DE1 boards, replacing the chips, and making them available to whomever wants them.  Generally, I can make them available for around $95 depending on the price for which I acquired them. I've had as many as four 'in stock' at a time and right now I have one which is earmarked for a gentleman who has asked me to hold it for him.  As I find good deals on them I try to scoop them up, refurb them if needed, and make them available to those who are interested.  I am primarily doing this to promote Gary Becker's CoCo3FPGA/DE1 project which I believe is a worthy cause and an excellent synthesis of the CoCo 3.

If you're interested in a refurb'ed DE1 let me know and I can probably get one for you in less than a month or so.


Dave Philipsen

> On Apr 14, 2016, at 1:32 AM, Michael Brant <brant.michael.l at gmail.com> wrote:
> 
> Ed, I think I remember hearing something about there being different DE 1
> revisions.  Do you have info on which revision or revisions are best and
> possible where to get them to ensure I have the right one?
> Thanks,
> Mike
> 
>> On Thu, Apr 14, 2016 at 12:18 AM, David Ladd <davidwladd at gmail.com> wrote:
>> 
>> Ed,
>> 
>> Go ahead and add me to this list as well lol
>> 
>>>> On Wednesday, April 13, 2016, Zippster <zippster278 at gmail.com> wrote:
>>> 
>>> Update…
>>> 
>>> The run of CoCo3 FPGA analog boards will definitely be a go as we have
>>> names for 22 boards now.
>>> I’m planning it for 25 boards as of now and have started ordering parts.
>>> 
>>> The price is set at $110 + shipping per assembled board, fully populated,
>>> WiFi and RTC modules included.
>>> 
>>> - Ed
>>> 
>>> 
>>> List for the run of CoCo3 FPGA analog boards.
>>> 
>>> Ed Snider               x1
>>> Gary Becker             x2
>>> Stephen Pereira         x1
>>> William Astle           x1
>>> Mathieu Chouinard       x1
>>> Ron Klein               x1
>>> snhirsch5               x1
>>> Brett Gordon            x1
>>> Frank Pittel            x1
>>> Ronivon Costa           x1
>>> Kip Koon                x1
>>> Bill Pappas             x1
>>> n6il                    x1
>>> Luciano Scharf          x1
>>> Justin Thomas           x1
>>> Mike Brant              x1
>>> Brian Holman            x2
>>> Rogelio Perea           x1
>>> James Igou              x1
>>> Malcom Ramey            x1
>>> 
>>> Total: 22
>>> 
>>> 
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>> 
>> 
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